Faults LCD

LCD TVs. COMMON FAULTS AND REPAIRS

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LCD TVs are today most trend, and they are invading the electronic entertainment market, ad seems to go further. Here are some faultfinding guidelines; with you can understand the fault to your TV to an extent, provided you must have knowledge in electronics.  Sometimes, you may even repair your LCD TV too. 

Let us discuss first with its power supply section, which is more venerable to faults.

Symptom:  The LED at the front panel of the TV do not light up, even connecting the power cord and switch the TV ON.  The unit appears to be Dead condition

There is a relay connected to power supply.  It should work [when it works, you can hear a click sound can be heard after the TV is switched ON]. Listen to this click sound.

Check the status of cable connections inside the TV for any loose. Check fuses fitted with power supply regulator board and any other. Check the input voltage at the SMPS [Switched Mode Power Supply] otherwise called as power regulator board. If all these are found OK, and still the set refuses to switch ON the Relay, and no power indicator LED lights up at its front panel, make sure that the main board is faulty.  There is no repair to it by replacing components.  Replacing it is the only repair work.

Come to other possibilities.

• Is power LED at its front panel is on and the lamp [backlight] is OFF.  If NO, check the connections of the power cable and all other cables connected to the power regulator board. If YES, does the power standby DC voltage [5VDC] is present or not.  If NO, change the main power assembly.

• If [5VDC] is present, check the main DV voltages [13VDC].  If it is not there, check the associated capacitors, especially check the ceramic capacitors if any connected to this voltage. If there is no fault with any of the associated components, and still there is no 13VDC, the power regulator board is faulty, and should be replaced.

• If this 13VDC is present and there is no main 120VDC present, check all the associated capacitors.  If they are also found normal. Power supply regulator board is faulty, and should be replaced.

• If there is 120VDC is present and no 3.3VDC check the regulator IC on the main board, either for open or for loose soldering points at its terminals. Suspect the main boar assembly too in this case.

• Check the voltages at CODEC, 3.3VDC, 8VDC & 9VDC.  If these voltages are there or not there, and the set wont switch ON, make sure that the main board is faulty.  In rare cases, a well-experienced service technician may set it right.  In 90% cases, replacement of 
• the main board is the only remedy.

If 1.2VDC core voltage, and VCC33, VCC12, VCC25 are present, appear at FRC board and still set refuses to switch ON, the fault is not with picture circuits. Then you have to check the LCD panel. 

Here is a Test Cases Of LCD LEDs TV From Different Sources. 

Samsung LE32R73BD: No picture and no OSD menu. Backlight ok.
Model/s: Samsung LE32R73BD LCD TV
Symptom: No picture and no OSD menu. Backlight ok.
Cure/Solutions: Reflow LVDS socket on screen driver PCB and mainboard PCB.

SAMSUNG LE32R74BD: TV dead. Pulsating noise from PSU and LED light flashes.
Model/s: Samsung LE32R74BD LCD TV
Symptom: TV dead. Pulsating noise from PSU and LED light flashes.
Cure/Solutions: Check shottky diode DM854 (MBRF1545CT) in PSU for short circuit.

BUSH LCD32TV005HD: After TV on few seconds, then the TV off again.
Model/s: BUSH LCD32TV005HD APH000 Chassis BEKO LM LCD TV
Symptom: Picture appears for a few seconds after switch on, after that the TV switches off again.
Cure/Solutions: Check C2042 and C2044 (both 680uf/35v) in PSU for capacity loss.

BUSH LCD32TV005HD: No Picture and no back light. Front controls react and remote control does not.
Model/s: BUSH LCD32TV005HD APH000 Chassis BEKO LM LCD TV
Symptom: No Picture and no backlight. The front controls was working but remote control does not
Cure/Solutions: Replace IR receiver (short circuit).

JVC LT32DX7B: No functions after lightning strike
Model/s: JVC LT32DX7B LCD TV
Symptom: No functions after lightning strike.
Cure/Solutions: The primary voltage 300v is present. But secondary voltage output was only 21 volt. Replace standby transformer T9201.

Sharp LC32P55E: Red LED appears for a seconds, relay clicks then dead.
Model/s: Sharp LC32P55E LCD TV
Symptom: Red LED appears for a seconds, relay clicks then dead.
Cure/Solutions: The resistor R751 blown. Replaced IC704 & R751.

Sharp LC32P55E: Dead after start-up. Bang-noise head before
Model/s: Sharp LC32P55E LCD TV
Symptom: Dead after start-up. Bang-noise head before.
Cure/Solutions: Replace R751 (0.1R/2W), IC704, D762, D725 and C725 (470pF/3K) in PSU.

Philips Chassis BJ3.0E LA: Switches off for a second or two intermittently
Model/s: Philips Chassis BJ3.0E LA LCD TV
Symptom: Switches off for a second or two intermittently. Relay clicks and standby LED remains green. Switches off intermittently with green LED on, no sound or no picture.
Cure/Solutions: Please check the 27MHz KDS quartz crystal (SSB, item 1H00). If all yellow marked crystals bearing with a "5E", "5J" or "5K" batch number direct replaced it. Also replaced all the silver marked crystals bearing with a "6D" batch number.

LG 37LE2R: No start-up
Model/s: LG 37LE2R Chassis LP61A LCD TV
Symptom: No start-up.
Cure/Solutions: Replace SMD regulator TL431 (U130) in PSU.

LG 27LC2R: No Backlight
Model/s: LG 27LC2R Chassis LP61A LCD TV
Symptom: No backlight
Cure/Solutions: Check the SMD fuse F1 on inverter board for open circuit.

Samsung LE27T51B: Dark frame with color stripes
Model/s: Samsung LE27T51B LCD TV
Symptom: Dark frame with color stripes.
Cure/Solutions: It looks like the unstable voltage problem. Check and replace UP4 (L1117DG) on T-CON board.

LG 32LE2RZJ: Remote control no functions at all
Model/s: LG 32LE2RZJ Chassis LP61A LCD TV
Symptom: Remote control doesnt function at all.
Cure/Solutions: Replace SMD capacitor at output of IR receiver.

ACER AL2671W: Dead
Model/s: ACER AL2671W LCD TV
Symptom: Dead.
Cure/Solutions: Replace power supply IC (TNY264PN) and resistor R60 (10R/0.33W, NFR type).

ACER AL2671W: No start-up. LED is orange
Model/s: ACER AL2671W LCD TV
Symptom: No start-up. LED is orange.
Cure/Solutions: When C380 unsuccessfully replaced. Standby PSU functions and standby 5v present. The voltage appears at pin PSON in the PSU after switch on but PSU does not start. Actually they are three 330K SMD resistors in series in the PSU which supply voltage for DLA001. Check if resistors are high resistive.

Bush IDLCD26TV05HD: No backlight and no picture. Sound ok and can be intermittently
Model/s: Bush IDLCD26TV05HD Chassis L9 (Beko) LCD TV
Symptom: No backlight and no picture. Sound ok and can be intermittently.
Cure/Solutions: Replace C512, C513 (both 1000uF/35v) and C519 (220uF/35v) in PSU. Also a 1000uf/16v capacitor on the signals board on the far right-hand side, near the top.



SONY

KDL40U2000: No start-up, red LED flashes 3 times
Model/s: SONY KDL40U2000 with SE1 Chassis LCD TV
Symptom: No start-up, red LED flashes 3 times.
Cure/Solutions: TV has slow start-up before this symptom occurred. When check standby 5v ok and PSU is heat sensitive. Check and replace the C6055 (47uf/25v) in G2 supply it will solve the problem.

BUSH LCD32TV022HD: Intermittently no start-up or dead after a few hours
Model/s: BUSH LCD32TV022HD with 17MB15 Chassis LCD TV
Symptom: Intermittently no start-up or dead after a few hours.
Cure/Solutions: The PSU replaced and EEPROM IC resoldered, but on help. Try to resolder IC220 (SDA5550) and IC224 on main board the TV back to normal.

EVESHAM ALQEM37SX: No start-up, the TV screen lights up, then switches back to standby mode
Model/s: EVESHAM ALQEM37SX with 17MB15 Chassis LCD TV
Symptom: No start-up, the TV screen lights up, then switches back to standby mode.
Cure/Solutions: Please check or direct replace the C877 and C878 on PSU board for open circuits. Sometime these caps will check good, but would breaks down under load.

Grundig GULENAR32HDIP: Stuck in standby mode, LED light is blue color
Model/s: Grundig GULENAR32HDIP with Chassis L9 LCD TV
Symptom: Stuck in standby mode, LED light is blue color.
Cure/Solutions: The blue LED always stays on, even when appliance is on standby mode. Capacitor C931 (1000uF) replaced but appliance is still dead with 12v and 24v ok. Check and replace diode D300 on the right-hand side, on middle-top of the main board.

Samsung LN40A650_A750_LN46A750: Unit tries to start with melody but cycles off and back on
Model/s: Samsung LN40A650A1FXZA,LN46A650A1FXZA,LN40A750R1FXZC,LN46A 750R1FXZA,LN40A750R1FXZA LCD TV
Symptom: Unit tries to start with melody but cycles off and back on
Cure/Solutions: If the unit tries to turn on and makes the startup melody but then immediately shuts off and starts again, unplug the LVDS cable and apply power again. If the set stays on, replace the T-Con board.

Samsung LNT4665FX/XAA lost brightness when you replaced MAIN PCB
Model/s: Samsung LNT4665FX/XAA LCD TV
Symptom: LNT4665FX/XAA lost brightness when you replaced MAIN PCB
Cure/Solutions: Because MAIN PCB BN94-01199E is designed to work with both models LNT4665FX/XAA and LNT4661FX/XAA when you replaced the board is possible to lose the brightness. Go in SERVICE MODE and turn value LVDS BYTE from 8 to 10.


Samsung LNS4051: Dead Backlight Flashes On Then Off
Model/s: Samsung LNS4051DX/XAA LCD TV
Symptom: DEAD BACKLIGHT FLASHES ON THEN OFF
Cure/Solutions: UNIT WOULD FLASH ON THEN OFF AND AUDIO WOULD WORK. YOU COULD SEE VIDEO WITH A FLASHLIGHT. SOMETIMES UNIT WOULD STAY ON AND RUN IF YOU CYCLED ON AND OFF MANY TIMES. FOUND BAD SOLDER CONNECTION ON IP BOARD TI801 ON PRIMARY SIDE. RESOLDERED AND CORRECTED PROBLEM.


Samsung most model: Flickering on the screen intermittently
Model/s: Samsung
LN32B360C5DXZA,LN32B530P7FXZA,LN32B460B2DXZA,LN32B 540P8DXZA,LN32B550K1FXZA,LN37B530P7FXZA,
LN37B550K1FXZA,LN40B550K1FXZA,LN40B530P7FXZA,LN40B 530P7NXZA,LN40B530P7FXZC,LN40B540P8FXZA,
LN46B530P7NXZA,LN46B530P7FXZA,LN46B550K1FXZA,LN46B 540P8FXZA.
Symptom: Flickering on the screen intermittently
When the unit is connected via HDMI to a Scientific Atlanta cable set top box set in by pass mode for resolutions 480p and 720p a flickering will occur.
Cure/Solutions: Change the cable box to a fixed resolution. OR Have the customer install the latest TV firmware which can be located on samsung.com.

PART 2

Samsung: LN32A450_LN32A330: Video will intermittently turn mostly white
Model/s: Samsung LN32A450C1DXZA,LN32A450C1HXZA,LN32A450C3HXZA,LN32A 330J1DXZA,LN32A330J1NXZA LCD TV
Symptom: Video will intermittently turn mostly white

White display with a faint image of OSD (On Screen Display) and video in the background. Video will intermittently turn mostly white with the OSD barely visible in the background. Even a black image or when the panel should not be showing any video, it is white. I found that one of the sub-boards inside the panel, the boards that the ribbon cable from the T-Con connect to, are not seated properly and the larger SMD capacitors on the board are intermittently making contact with the metal frame of the set, effectively creating a short to ground.
This is one of the panels that are mounted upside down, so the stand mounts just below and behind the panel frame. Any slight pressure from the stand can cause the frame to make contact. In many cases, the TV can be slightly flexed to make this issue occur.
You may see besides a T-Con ribbon cable, that the sub-board is not seated properly, and is in fact bowing towards the outer frame.
Pulling the frame out slightly, you can see one of the SMD capacitors that can make connection with the frame.
Cure/Solutions: Adding felt to the affected area will solve the issue.

Samsung most model: Firmware Blinking in Red at the Top of the Screen
Model/s: Samsung LN32B360C5DXZA,LN32B530P7FXZA,LN32B650T1FXZA,LN32B 460B2DXZA,LN32B540P8DXZA,LN32B550K1FXZA,
LN32B640R3FXZA,LN32B457C6HXZA,LN32B450C4HXZA,LN37B 457C6HXZA,LN37B530P7FXZA,LN37B650T1FXZA,
LN37B550K1FXZA,LN40B457C6HXZA,LN40B550K1HXZA,LN40B 500P3FXZA,LN40B550K1FXZA,LN40B650T1FXZA,
LN40B530P7FXZA,LN40B530P7NXZA,LN40B750U1FXZA,LN40B 540P8FXZA,LN40B610A5FXZA,LN40B630N1FXZA,
LN40B640R3FXZA,LN46B650T1FXZA,LN46B530P7NXZA,LN46B 530P7FXZA,LN46B550K1FXZA,LN46B610A5FXZA,
LN46B540P8FXZA,LN46B630N1FXZA,LN46B640R3FXZA,LN46B 750U1FXZA,LN52B550K1HXZA,LN52B610A5FXZA,
LN52B550K1FXZA,LN52B540P8FXZA,LN52B530P7FXZA,LN52B 630N1FXZA,LN52B750U1FXZA,LN55B640R3FXZA,
LN55B650T1FXZA LCD TV.
Symptom: Firmware blinking in Red at the top of the screen.
Cure/Solutions: Problem - After changing the main board, I'm now stuck with the firmware text info blinking in RED print at the top of the screen.
Solution : The unit is stuck in aging mode. To exit, simply hit the menu button on the TV itself.

Samsung LNT4065_LNT5265: With Signal-Blue Screen and Flashing White Short Horizontal Lines
Model/s: LNT4065FX/XAA,LNT4665FX/XAA,LNT5265FX/XAA,LNT4061FX/XAA,LNT4661FX/XAA
Symptom: Blue screen without signal, with signal -blue screen with flashing white short horizontal lines
Cure/Solutions: Refit or replace LVDS cable, check if the cable not strangled by the metal cover and loosen up the screws of the cover.

Samsung LNT3242_3232 : Wont Power On
Model/s: Samsung LNT3242HX/XAA,LNT3232HX/XAA LCD TV
Symptom: Wont power on
Cure/Solutions: TV would not come on. Removed the back and as soon as we did the set came on.
Found glue all on the cables to the smps. Cleaned glue off and cleaned the terminals. Set operates normally.

ACER AL2671W: No start-up. LED is orange
Model: Acer AL2671W LCD TV
Symptom: No start-up. LED is orange.
Cure/Solution: Check C380 (100uf.16v) under heatsink, next to U42 and U61 on signal PCB for capacity loss.

Sony KDL32U2000: No Picture
Model: Sony KDL32U2000 Chassis SE1 LCD TV
Symptom: No Picture
Cure/Solution: Check SMD fuse CP101P on LVDS board. The LVDS board is behind the BDT board.

SONY KDL32S2010E: Switches to standby for a short while, then back again
Model: SONY KDL32S2010E Chassis WAX2 LCD TV
Symptom: Switches to standby for a short while, then back again
Cure/Solution: Replace standby push button on user control, has contact resistance.

Philips 32PF3320/10: "F" is displayed on screen
Model: Philips 32PF3320/10 Chassis LC4.5 EAA LCD TV
Symptom: "F" is displayed on screen
Cure/Solution: TV is in factory mode. To quit the factory mode, press both "VOLUME" "-" keys and "PROGRAM" "-" for 5 seconds simultaneously.

LG 32LC56: Picture divided into several parts. Distorted picture
Model: LG 32LC56 LCD TV
Symptom: Picture divided into several parts. Distorted picture
Cure/Solution: Replace T-CON board (Part Number: 218394).

LG 32LC56ZC: No start-up. Standby LED flashes from red to green
Model: LG 32LC56ZC LCD TV
Symptom: No start-up. Standby LED flashes from red to green
Cure/Solution: Replace C202, C206, C217 and C218 (2200uf/10v all), and C226 (470uf/25v).

GOODMANS GTV26WLCD: Shuts down and LED blinks
Model: GOODMANS GTV26WLCD LCD TV
Symptom: Shuts down and LED blinks

Cure/Solution: Replace C877 and C878 (both 15nf/630V).

Imran Ashraf 

L.C.D L.E.D T.V Panels Connection and Voltages Understanding

L.C.D L.E.D T.V Panels Connection and Voltages Understanding
BY IMRAN ASHRAF 
Here we talking about the main voltages and pin connection of L.C.D and L.E.D T.Vs
Panels, every technician should know where to test and how to check voltages of each connection as they mention in Service Manual or schematic diagram or at least you should know the basic working voltages.

Connection Name Connection Working Voltages
1. VGL in Driver negative P.supply1 Around -10.5v
2. VCL in Driver negative p.supply2 Around -10v to -12v
3. VSS Digital ground GND
4. VDD VDD is the logic supply input for the scan driver.

5. VGH Supply LCM driver output Around 12v+ to 19.5v+
6. STV Vertical Sync Input. The rising edge of STV begins a frame of data. The STV input is used to generate the high-voltage STVP output. PulseL.C.D L.E.D T.V Panels Connection and Voltages Understanding
Here we talking about the main voltages and pin connection of L.C.D and L.E.D T.Vs
Panels, every technician should know where to test and how to check voltages of each connection as they mention in Service Manual or schematic diagram or at least you should know the basic working voltages.

Connection Name Connection Working Voltages
1. VGL in Driver negative P.supply1 Around -10.5v
2. VCL in Driver negative p.supply2 Around -10v to -12v
3. VSS Digital ground GND
4. VDD VDD is the logic supply input for the scan driver.

5. VGH Supply LCM driver output Around 12v+ to 19.5v+
6. STV Vertical Sync Input. The rising edge of STV begins a frame of data. The STV input is used to generate the high-voltage STVP output. Pulse
7. CPV1 Vertical Clock-Pulse Input. CPV1 controls the timing of the CKV1 and CKVB1 outputs, which change state (by first sharing charge) on its falling edge.
Pulse
8. CPV2

9. V.COM out Vertical Clock-Pulse Input. CPV2 controls the timing of the CKV2 and CKVB2 outputs, which change state (by first sharing charge) on its falling edge.

Common signal output TFT Clock pulse

Signal pulse
10. POL in Supply input common signal Signal
11. VDC in Supply +5.0v min
12. VON Gate-On Supply. VON is the positive supply voltage for the CKV_, CKVB_, and STVP high-voltage driver outputs. Around 20v+
13. V-OFF Gate-Off Supply. VOFF is the negative supply voltage for the CKV_, CKVB_, and STVP high-voltage driver outputs. Around 8V-

Brief Details of Panels Connection Points

VDD VDD is the logic supply input for the scan driver.
VON Gate-On Supply. VON is the positive supply voltage for the CKV_, CKVB_, and STVP high-voltage driver outputs.
VOFF Gate-Off Supply. VOFF is the negative supply voltage for the CKV_, CKVB_, and STVP high-voltage driver outputs.
STV Vertical Sync Input. The rising edge of STV begins a frame of data. The STV input is used to generate the high-voltage STVP output.
CPV1 Vertical Clock-Pulse Input. CPV1 controls the timing of the CKV1 and CKVB1 outputs, which change state (by first sharing charge) on its falling edge.
CPV2 Vertical Clock-Pulse Input. CPV2 controls the timing of the CKV2 and CKVB2 outputs, which change state (by first sharing charge) on its falling edge.
EN Enables the MAX17121. Drive EN high to start up the MAX17121 after a delay time, which is set by a capacitor at DLY.
CKVB1 High-Voltage Scan-Drive Output. CKVB1 is the inverse of CKV1 during active states and is high impedance whenever CKV1 is high impedance.
CKVB2 High-Voltage Scan-Drive Output. CKVB2 is the inverse of CKV2 during active states and is high impedance whenever CKV2 is high impedance.
CKVBCS2 CKVB2 Charge-Sharing Connection. CKVBCS2 connects to CKVCS2 whenever CPV2 and STV are both low (to make CKV2 and CKVB2 high impedance) to allow CKV2 to connect to CKVB2, sharing charge between the capacitive loads on these two outputs.
CKVCS2 CKV2 Charge-Sharing Connection. CKVCS2 connects to CKVBCS2 whenever CPV2 and STV are both low (to make CKV2 and CKVB2 high impedance) to allow CKVB2 to connect to CKV2, sharing charge between the capacitive loads on these two outputs.
STVP High-Voltage Scan-Drive Output. STVP is connected to VOFF when STV is low and is connected to VON

Quick Guide LED Tv Panel Repair

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Service Guide LCD TV

LCD LED Tv Panel Bypassing Methods eBooks.

1.  Horizontal stripes Panel Number T#######VC V bypass.

2.  Problem low contrast, whitish image by pass.

3.  Secrete of LED Panel CLAA####FA04S Bypass.

4. SAMSUNG LE26C350DW SAMSUNG LE32C350DW Panel bypass.

5.  LCD TVUse Panel V####B1-L01 T-CON V315B1- by pass.

6.  Problem: Bands appear immediately after switching on the power supply…By Pass.

7. Panel LC420WX5 Used in Many LCDs TVs’ LG,PHILIPS By pass.

8. SAMSUNG LTA320WT-L05 bypass.

9. Panel Samsung LTA320W####2-L13, bypass.

10. Samsung LE32R71 picture distortion like net allover the picture.

11. SHARP LC  Models ,LC Model P50-70 Bypass.

12. Photos defects panel Not Repairable.

13. Fault occurs defective discharge.

14. Samsung LTA3##0WT-0 Problem is the failure ofthe backlight (CCFL).

15. LG model15LS1R CL-81.Fault Menu does not appearcorrectly.

16.  LG LCD 22 C30 Plain White Screen.

17.  Frequent vertical stripes in the image acrossthe screen Solution Problem.

18.  Fault: lay in the fact that when the imageappeared in just 30 seconds, the red almost was not.

19.  FAULT : Trouble- 5 to 20 minutes (cold) ahorizontal bar moves vertically then another and another, 10 seconds throughout completely disappears, the problem occurs only with a tuner, AV on allnormal.

20. SONY BRAVIA Absolutely identical symptoms manifestations malfunction.

21. KDL46X3500 UNEVEN BACKLIGHTING Defect:  lights in the center of the raster ford effects.

22. Fault: No picture, and sometimes colored vertical thin black horizontal stripes across the screen.

23. LG Fault: The screen is horizontally moved on top of the bottom band image is not visible but the graphics is visible clearly.

24. SAMSUNG LE32S81. Fault: Slowly illuminates the image, turning into two part.

25.  PHILIPS26PF9946/12, CHASSIS AND LC4.2E PHILIPScolor stripes at half of 1/3 .

26. HITACHI 37LD9000TA Problem: Stripes, ghost pictures…

27.  SAMSUNG LED TV LE42D50#0 Fault:  Noise bar on picture of every input.

28. TV LG 42PX3RVA-ZC MF Problem: Plasma with green stripes in the form of image noise.

29. PANEL# V400H1-L12 REV1 TCON V400H1 PETALNT39530H-C5208A Driver 1138 AA-A521AT Common Problem of this types of panel youshould Test and jump these connection as we shows.

30. Sony Barvia Defect The image is not clear with horizontal stripes.

31. Panel M260TWR1 Modification.

32. V315B3-L04 Panel Connection.

33. PANEL LTF400HA03 APPENDIX I33VVBC-X01. MAJOR OPEN CONNECTION By pass.

34. Panel V260B1 Major Problem by pass.

35. Sony Came to malfunction doubles the image vertically and "banding" in the upper part of the image by pass.

36. SAMSUNG PANEL LTA320WT-L05 By pass.

37. PANEL T370XW02 V.5   TCON T370XW02 V.5 CB By Pass.

38. PANEL LTY460HB08 460HBSR2LV1.1 by Pass.

39. LTA320WT-L15, STRAP 320WTSL4LV0.0 by Pass.

40.  Test Case LC420WUD-SBM2 read care fully.

41.  Panel LC420W02 by pass.

42.  Panel P-MOD 46M1T by Pass.

43.  HT215F01-100 by pass.

44.  Philips 32PF3320/10 Panel CLAA216WA01 by pass.

45.  Panel LC320WUE-SAA1 stands in 32PFL5604 ByPass.

46.  Panel LTA320AB02  T-CON - 320AB02CP2LV0.3,

47.  LTA320WT-LF2 DAEWOO DLP-32C1 by pass.

48.  Panel Samsung LTA320W2-L13, fee T-CON:320W2C4LV6.4 by pass.

49.  V260B1-L11 and V260B1-by Pass.

50.  Panel LTA320WT-LF2 by Pass.

51.  Philips 32pf5321/12   Bars on picture.

52.  T260XW05 V0. T-con built on the top plate ..bypass.

53.  Panasonic TX-R32LE8.

54.  Chinese fault.

55.  SAMSUNG PS42C91HX_NWT.

56.  Sharp KD603WE01, VCT6973G B3, LCD-module LK315P3LZ10Z green border, as in the image sloping noise bands, with high brightness in light areas in the image goes negative.

57.  SAMSUNG LA46M81B. Panel LTA460HB05 by pass.

58.  Panel AUO T420XW01 #V0 (LCD TV SharpLC-42PD2RU)  Modify by pass.

59.  Panel AUO T420XW01 #VC stands 42J bars…By pass.

60.  Panel LTA320WT-L06 T-CON #320WTC2LV3.7 by pass.

61.  Panel LC320WUE-SAA1 stands in #32PFL5604, ByPass.

62.  #Panel LTA320WT-LF2 by pass.

63.  Model Samsung LE37M87BDX/BWT -Matrix T370HW02v.2 by pass. 

64.  Panels CLAA215FA and #panel - CLAA215FA04 byPass.

65.  PANEL T370HW02 V1 by pass.

66.  T260XW04 V.3 Pads RM76180FC-086 driver06B019CCA1 by pass.

67.  Panel LG LC470WUE by pass and much more,

68.  List of Test Cases Faults for LCD and LED TVs.

69.  List of LCD,LED TV Factory Reset and Servicemodes.

70.  Software Information.

71.  Power supply repairing

72.  Main board repairing.

73.  Inverter and Blaster repairing and by pass.

74.  T-Con boards testing with true voltages guide.

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Imran Ashraf

China Universal Boards Softwares

Please Visit Here For Softwares 

https://electronics-tricks.blogspot.com

China Universal Board Know How

How Backlight Works in LCD TV

*CCFL & EEFL Inverter Board Troubleshooting*

Now that we have a basic understanding of the comparable differences with
CCFL & EEFL lamps, lets get started in troubleshooting the circuitry that
drives both lamp technologies. These circuits are called Inverter boards
(trade Name), and we will start with inverter boards used for CCFL
backlights, which are usually labeled as Master & Slave inverter board
circuitry. The term ‘master/slave’ inverter boards (half-bridge configuration)
are derived from the electrical functionality the two boards perform together
to start-up, balance, and run the CCFL lamps (Master = high side/ Slave =
low side). The master inverter board balances the over-all load condition
between its self (i.e. master) and its slave.

The master inverter board controls the output of the slave inverter board, and the output of the slave
inverter is determined and formatted by the load condition of the master
inverter.

 The slave inverter simply reacts to 3 basic load conditions from the
master inverter, and that is the firing load, start load, and operating load
conditions commanded by the master inverter board. Together both master
and slave inverter boards perform as one CCFL backlight control system.

Inverter boards simply take a low DC input voltage (by using analog circuits
or monolithic control IC), and inverts the DC voltage to an AC sine wave
output to run the florescent lamps, also to separately control the dimming
and brightening affects of the lamps. There are various ways in-which
inverter boards can fail to produce an AC sine output, causing the lamps not
to ignite. If the lamps don’t light up or if there’s a quick flicker of light
across the display screen, this usually due to one of the inverter boards
(master/slave) having a start up fault.

A brief flash of light across the display screen could also be a bad CCFL
lamp, I find this to be a rare fault (through servicing many backlight faults
over long years) but by no means don’t under estimate the fact that lamps do
fail and I have replaced some, and it’s a tedious task just to access the lamps
especially for 50+ inch screens.

85% of the backlight faults I have serviced, stem from faulty components on
inverter boards, 10% have been ‘START’ or INV-ON’ command signals
from the main digital board, 24V or 12V supply missing or reduced from
SMPS power board or D-Dim signals from T-con board.

 The other 5% have
been the actual CCFL lamp its self. T-con boards that have a flat white
ribbon cable connected too the master inverter are mainly used for Digital￾Dim (P-DIM OSD) which is different from A-Dim (Analog Dim). P-Dim
controls the BURST-oscillator and synchronizes with OSD backlight
command options from the customer menu according to room light
conditions (PWM_Sync Dim).

The T-con gets its P-Dim command input from the main digital board, and if
a T-con with this type of OSD P-Dim connection develops a fault (in its P￾Dim output circuitry) it can cause the master inverter to either cancel start￾up, or can cause the master inverter to get stuck in “Reset’ which have
caused the backlights to turn on & off (blinking) in 1+ second intervals with
no picture raster (just blinking backlights only).

There is no picture raster
because the T-con has a fault condition affecting its logic output (D-Dim) to the master inverter, making the master inverter ‘reset’ over and over,
therefore the main digital board has no run-time to boot-up successfully.

When the LVDS cable from the main digital board was disconnected from
the T-con the blinking of the lamps have stopped, and the backlights stayed
on as a result. As stated previously, there are many ways an inverter board
can fail to produce an AC sine output to the lamps, and the inverter failure
can be direct or indirect.

Direct failure meaning the backlight problem is a result of faulty
component(s) directly on the inverter boards, or bad connection points.

Indirect failure meaning the backlight problem is not a result of faulty
component(s) on the inverter board its self, but rather an inadequacy or
absence of a critical input voltage or a crucial input command from another
board that feeds the inverter.

The example given above with D-Dim’ is a descent reference to an indirect
inverter board failure. It wasn’t the master inverter board causing the
blinking of the lamps but instead it was an indirect fault of the T-con’s D￾Dim output too the master-INV board, causing the inverters to strobe the
lamps Note, the screen actually has a running picture, but without any backlights
the picture image can’t be illuminated (viewable).

 This kind of backlight
problem indicates a failure on one of the inverter boards (master/slave).

When inverters fail to drive the lamps, sometimes there are more than 1 or 2
fault scenarios that can cause this to happen. Inverter boards get their power
from the main power supply circuit of the TV; better known as a switch￾mode-power-supply (SMPS) inverter boards usually operate from a 24VDC
input supply source (some use 12VDC input supply).

 If the power board
fails to deliver the inverters supply voltage (24V or 12V) then its quite
obvious the inverter boards simply will not function without a source supply
voltage. Also many inverters receive an ‘INV_ON’ logic-high command
from the main digital board usually labeled INV_ON (or similar). The main
digital board sends this INV_ON command (approximately 3V) to the power
board (through a switching IC after 24V/12V supply is verified), which triggers the master inverter to turn-on. If the input INV_ON signal is not
switched properly from the power board or is not being sent from the main
digital board, then the master inverter wont actuate start up (via inverter
control IC)…. even though the inverters are getting their 24V/12V supply
they wont start up without the INV_ON signal (enable) which turns on the
inverter control IC.

 The burst-oscillating mode from the control IC is
dependent on the PWM and DC external input. There are more failures that
can cause the inverters not to produce a working HV output,