Here is Some Panasonic Blink codes for quick repair Of LCD TV.

TC14LA2 Dead set. No response to any button. The external power supply is delivering the correct +15Vdc to the TV rear.
Check or replace the N channel MOSFET Q8, located on the Driver board.

TC19LX50 No picture. Power LED blinks 9 times.
No communication between GC4 IC4016 and the Main micro IC1103. Replace A board with part number TXNA10LFM.

TC22LR30 LED blinks once every 5 seconds. Unit appears to be dead. No picture, or Audio is present.
Check for the backlight voltage on connector P2, Pins 9-15 (15V), and Pins 1-7 (gnd).

TC22LT1 Excessive brightness.

Check pins 3, 4, and 5 of connector N009B for 15V which is the source voltage for the LCD Panel inverter power supply. If it is ok, replace the LCD Panel.

TC23LE50 No picture. Power LED blinks 2 times

. Replace the power unit if the 24V is missing. If 24V is present, change the LCD panel

Model Symptom Possible Remedy
TCL37D2 The unit shuts down and the power LED blinks 10 times. 1. Disconnect the connectors CN01 and CN02. If the unit powers up and stays on with no picture , Replace the LCD panel.
2. Reseat the connectors A10 and V10. Confirm the operation of the unit.
3. Before the unit shuts down, quickly check the DTV12V coming from the power supply. Confirm its presence on the A board. If missing, use an ohmeter to determine the location of the short (P or A board). If there is not a short, replace the P board.
TCL37D2 At power up, the screen flashes and the unit shuts down. the power LED blinkS 9 times. Check connector A21, it may not be seated properly.
TCL37D2 When troubleshooting for a shutdown, panel’s disconnection may become necessary. Click here to see a hint on panel’s disconnection

TCL37G1 The TV shuts down and the power LED blinks 1 time. To determine the source of the defect, click here for a troubleshooting hint.

TCL37G1 Emergency Alert System (EAS) message continues to display on TV after the warning has terminated. The problem is corrected with PEAKS software version 1.27 for X1 models and version 1.28 for S1, G1 and U12 models.
TCL37G1 SD card motion video does not play. The operating manual incorrectly states “lets you easily view still and motion image….by inserting an SD card…
Actually, only still pictures from an SD card can be displayed on the TV.
TCL37G1 No OSD, No Video, the unit only displays the internally generated diagnostic patterns. Reseat the LVDS connector at both ends (the A board and the panel).
TCL37G1 After replacing the P or A board, the unit is dead. There is no relay click. Check pin 23 of connector P2/A03. It is probably bent, causing the a board not to receive the STB5V from the power supply.
TCL37G1 “OOO” appears in the middle of the screen and “Temp” appears at the upper right corner. Reset the TV by holding the front panel Volume Down button and the remote control OK button for 4 seconds.
TCL37G1 After replacing the A board, the unit is stuck in the Service Mode. Try each of the two steps one at a time until the unit comes out of the service mode and display “First Time Setup”
1. Vol – on TV and Menu on the remote simultaneously for 3 seconds or more.
2. Vol – on TV and OK on the remotesimultaneously for 3 seconds or more.
TCL37S1 The unit shuts down and the power LED blinks 14 times. Replace the A board.
TCL37S1 After replacing the P or A board, the unit is dead. There is no relay click. Check pin 23 of connector P2/A03. It is probably bent, causing the a board not to receive the STB5V from the power supply.
TCL37S1 “OOO” appears in the middle of the screen and “Temp” appears at the upper right corner. Reset the TV by holding the front panel Volume Down button and the remote control OK button for 4 seconds.
TCL37S1 Power relay keeps cycling on/off. Check for a short (maybe caused by a coin) in the SD card input slot.
TCL37S1 The TV shuts down and the power LED blinks 1 time. To determine the source of the defect, click here for a troubleshooting hint.

TCL37S1 No OSD, No Video, the unit only displays the internally generated diagnostic patterns. Reseat the LVDS connector at both ends (the A board and the panel).
TCL37S1 No or intermittant backlight. Unit may shutdown with a 1 blink error code. Follow these steps to determine if the panel backlights or the power supply (P) board is bad:
1. Unplug both backlights from the P board.
2. Plug the TV in, wait for the relay to finish clicking on and off.
3. While watching the S101 neon lamp on the P board, press the power button .
With the backlights disconnected, this lamp should come on within 10 seconds, then go off.
Conclusion:
If the S101 lamp never comes on, the P board is bad. If the S101 lamp does turn on, the backlights are bad.
TCL37S1 SD card motion video does not play. The operating manual incorrectly states “lets you easily view still and motion image….by inserting an SD card…
Actually, only still pictures from an SD card can be displayed on the TV.
TCL37S1 After replacing the A board, the unit is stuck in the Service Mode. Try each of the two steps one at a time until the unit comes out of the service mode and display “First Time Setup”
1. Vol – on TV and Menu on the remote simultaneously for 3 seconds or more.
2. Vol – on TV and OK on the remotesimultaneously for 3 seconds or more.
TCL37S1 Emergency Alert System (EAS) message continues to display on TV after the warning has terminated. The problem is corrected with PEAKS software version 1.27 for X1 models and version 1.28 for S1, G1 and U12 models.

Model Symptom Possible Remedy
PT40LC12 Lamp is making Noise Check the Lamp Connector
PT40LC12 Dark Screen Check the Center filament of the bulb it should be clear not gray or black
PT40LC12 Image is reversed on screen Change the LR setting in Factory mode from ON to OFF. 1) Press and Hold the Volume Down Button on the Center Panel and press the Recall Button on the remote until Work Mode is displayed on the bottom of the screen. 2) Press and Hold the Volume Down Button on the Center Panel and press the Swap Button on the remote until Factory Adjust is displayed on the screen. 3) Use the Channel down button to select DIGITAL and press the Action button. 4) Select LR from the menu and change the setting from ON to OFF
PT40LC12 Red, Green or Blue Horizontal line Check the LCD/Prism Unit
PT40LC12 Brightly Lit Pixel Check the LCD/Prism Unit
PT40LC12 When using the PC input, the OSD information is faded and the entire screen flickers Check the Phase adjustment
PT40LC12 Fixed Bluish and/or Greenish and/or Reddish blob(s) visible on screen when set is on. Dust particles must have been sucked into the Projector Unit and got attached to the LCD Panels. Click here for remedy

PT40LC12 TV does not come on. Power LED blinks 2 times. Lamp cover switch is open. p/n = LSEP3052A
PT40LC12 Shuts down. Mild ballast transformer burn odor from the TV rear. Ballast damaged. Lamp elements may have shorted, damaging the ballast. Check the lamp for loose elements inside before powering up the set with a new ballast.
PT40LC12 Quick lamp time reset procedure. 1. Turn the TV on.
2. Hold the VOLUME DOWN button on the front panel
3. Hold the remote control’s PIP / PLAY button in at the same time. After 10 seconds, the OSD message will display “Lamp time was Reset to 0”. Only the EUR7603Z80 OEM remote has the Play / PIP button that works.
PT40LC12 Power LED blinks continuously. If the thermal fuse above the lamp housing is bad, replace it and check for reduced fan-speed that could be caused by dirt, lower than 7Vdc source, or duct blockage. If the fuse is OK, replace the ballast assembly.
PT40LC12 Unit shuts down after operating between 2 to 5 minutes. The TEMP LED blinks 3X. Check the Lamp Thermistor R2901 (280k ohms at room temperature) located above the Lamp housing. Also check the Front Thermistor R2911(60k ohms at room temperature) located behind the filter which is behind the right speaker grill when facing the TV. If both thermistors are OK, resolder the main board by connector P6205 and microprocessor IC6001/pins 87-88.
PT40LC12 Picture “blinks”! TV works for a period of 5 mins to an hour then goes dark but the video and audio return within 20 seconds only to go out again within an hour. The Mercury vapor lamp is the primary suspect.
PT40LC12 Jail Bars in Picture 1. Reseat connectors P2001, P2002 and P2003.
2. Press the volume button. If the bars go through the OSD (OSD is behind the bars), replace the light engine. If the OSD is clean (no bars in the OSD), the problem is in the Main board or prior video processing, not the light engine.
PT40LC12 Picture is Keystone shaped Check the Projection Assembly.
1. Reposition the lens from the front after loosening 4 side screws. See the service manual for pictures if needed.
2. Check the metal supporting the screen just above the lens assembly to see if it is bent.
3. Replace the optical assembly as the last resort.
PT40LC12 Red, Green, or Blue vertical or horizontal stationary lines in the picture, using any input. Replace the light engine
PT40LC12 Screen flickers and the OSD is faded when using the RGB PC input. Adjust the Phase:
1. Press the ASPECT remote button
2. Highlight SCREEN
3. Press ACTION for the menu screen
4. Select ADJUST
5. Adjust for minimum flicker
PT40LC12 Split picture (Picture with picture) image does not fill the screen at the sides (left & right) The thin black sides are normal in this mode.
PT40LC12 Picture is Distorted Check the Tilt and Focus Adjustment
PT40LC12 Ghosting in all modes even OSD information Check the Projection Assembly
PT40LC12 Greenish picture on all inputs and the menu Replacement of LCD Light Engine resolved the problem
PT40LC12 No audio when using video 3 or RGB audio input, and audio level is low when using component video inputs.
Audio output by the “Line audio” output jack on the rear panel is distorted. Main board SW -5V regulator SMD transistors Q1030 and Q1031 are suspect. Replace the transistors located under the Main board.

About

Hello Friends My name is Imran khan and i am from Pakistan karachi and i have my own repair shop in Karachi,i repair LCD CRT Tv and monitors,Vcr,DVds,Microwave and U.P.S electronics circuit.

3 comments on “Some Panasonic LCD repair Tips

  1. bogie says:

    Wow…thanks a lot.God bless for sharing those tips.

  2. thanx says:

    Sorryy

    Its sir

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