My TV stopped working - No picture or sound. The LED at the front flashed quickly 4 times and 1 slow. I have replaced the Q302 on the power-supply-board (found the advice somewhere). It helped so far, that the sound now is back on, and the LED has tuned blue as expected. But still no picture. Any suggestions??
Try the old flashlight test, turn off the lights in the room. Turn on the set and flash a bright flashlight on the screen. Do you see the image or is the screen totally black?? If you see the image, then most likely you have a backlight problem. Verify that you have 24V on the power supply for the inverter
SOURCE: Loud pop Blank screen 42 inch Viore Plasma
Unfortunately, that board is the inverter board. And for this model the inverter board is only supplied with the the PDP panel. The panel is quite expensive, here's a link if needed:
LG 42PX5D Replacement Part PDP Plasma Display Panel
SOURCE: LG 42PX4MVH PLASMA TV - Sound but no picture.
I have the same issue with my LG 42PC3DVA and I narrowed it down to the Y SUS board. After a little research there are a few items that are prone to go. The ceramic fuses (as you found), sometimes the capacitors on the Y SUS, Z SUS, and power supply go along with them You can tell because thy will be bulged at the top instead of flat. I replaced a few of my capacitors - they are only $0.89 each so it was MUCH cheaper than a board.
The other thing that is common on the Y SUS in particular are the FETs (also called MOSFET). They can be replaced if you are good with a soldering gun but they are static sensitive so be grounded. They are also a bit tricky to test so you may want to do some research on how to determine if this is the issue... or you can just replace the whole board.
SOURCE: LG PDP42X3 No Picture - I have sound and blue
This condition, sound no picture, is generally a result from a failed y-sustain and/or x-sustain board. You can check the fuse for continuity or resistance using a multimeter. I am helping someone repair their LG 42pc3d, that's why I thought I'd help you out too.
Y sustain board 6871QYH053B
Z sustain board 6871QZH056B
SOURCE: I must turn on and off multiple times for picture
Ur Tuner signal board have problems,must be change.The problems u discribing,only two boards cause this Power or Tuner boards.
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LED Indications
The front panel Status LED provides an indication of
the set's operation and the possible cause of a malfunction.
If an abnormal condition is indicated, perform the
Self Diagnostics procedure.
Self Diagnostics
To activate, press the front panel <ACTIVITY> &<CH
??> buttons at the same time and hold for 5 seconds.
The STATUS LED will then flash denoting a two digit
code.
• The number of flashes indicates the value of the
MSD (tens digit) of the Error Code.
• The flashing then pauses for approximately 1/2
second.
• The LED then flashes indicating the value of the
(ones digit) of the Error Code.
• The Error Code is repeated a total of 5 times.
Example: If the Error Code is "23", the LED
will flash two times, pause, and then flash three
times.
Table 2-2: LED Indications
Error Codes, descriiptions and the most likely cause of
the error are listed in Table 2-3.
Note: The TV must be in "Shut Down." The LED
will probably be indicating an abnormal
condition. If the TV is switched Off, AC is
removed, or a System Reset is performed, the
code automatically resets to "12" No Error.
See the Error Code Log to retrieve a history of
errors.
Note: Use the front panel buttons, not the remote
control.
Note: If there is no response, the front panel may be
locked by a V-Chip setting. To unlock, press
and hold <ACTIVITY> on the front panel for
8 seconds.
LED Indication Condition
Off Off (standby)
Green Power On
Slow Blink Green Power Off with Timer Set
Fast Blink Green (80 seconds) > Off Power Off (Cooling fan still working, 80 sec)
LED Indication Condition
Red Lamp Failure
Yellow TV Too Hot
Slow Blink Red TV May Require Service
Slow Blink Yellow Lamp Door Open or No Lamp Installed
NORMAL INDICATIONS
ABNORMAL INDICATIONS (For details perform Self Diagnostics Procedure.)
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