I'm a servicer unaware of the modification you spoke of. This set belongs to a friend of mine with the same symptoms. Warranty has expired as he did not hang it up for use til recently. Can you tell me technical procedure for the fix?
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Since your unit is under warranty period, don't ever attempt to open the back panel because it will void the warranty. Give proper ventilation on the back panel, keep away all obstruction from the vent to allow sufficient air flow. This will avoid trigger the over heat temperature sensor from the processor which caused the subsequent shutdown. If the symptom still persist, inform LG service center that the symptom already got worst :-)
Hope I helped you.
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Most likely it is the LCD Panel causing this and it could get worse. The only fix is to replace the LCD Panel and if it is out of warranty it would be too costly. We are talking replacement cost of $900.00 for the part its self.
Make sure that the cable box set set up menu has the sound selection as HDMI. This is needed especially if it is a Scientific Atlantic Cable Box.
If this does not correct the problem, call LG Customer Service to get a local Service Facility to take a look at it.
Hope this helps,
Do not keep forcing this unit on - - This particular unit has a VERY commonly known problem and there are at least five tech bulletins from LG explaining this and other symptoms for the failure. In a nutshell there are coils that have to be removed and replaced with a jumper wire. This is not a repair you want to tackle so please get some experienced help for this one. A good technician will look-up the bulletins and educate themselves on the manner of the repair.
Almost all of the symptoms that can happen are intermittent and can be extremely difficult to verify. For this reason make sure to discuss with the technician that he replace all of the coils listed in the bulletin not just the ones causing your particular problem. Here's a list of symptoms that these defective coils cause, taken right from the bulletin:
1. Channels Or Menu Functions Scroll On Their Own 2. Remote Does Not Function 3. Tv Randomly Powers On And Off On Its Own 4. Dead 5. No Backlight
Hope this helps!
William Rayburn, CET
This set has a modification that needs to be done. It will also start turning on by itself and changing channels rapidly.
It's two weeks old. Take it back to the Retailer or if that is not an option contact LG at 1-800-243-0000 to get a local servicer in your area.