LG DU-37LZ30 LCD TV Shuts off after an hour

[120volts]

TV Shuts off after an hour
No sings of bad caps
Heat sinks get pretty hot on the power supply
A couple of the caps get warm


Any help is greatly appreciated.

[tom66]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

Warm stuff up with a hairdryer slowly. If it shuts off quicker when warming an area you have found the fault.

[120volts]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

Sounds like a good idea

[120volts]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

OK I usually hate to modify Stuff to get working "BUT"
This TV was shutting after an hour and I found that the power supply heat sinks were just about to hot to touch.
I ended up putting two computer fans in parallel to equal 24V and connected them to the back-light supply.


Now the power supply runs quite cool and the TV doesn't shut down

[ben7]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

Interesting. I wonder if this is a design defect?!

[truep]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

Leaking caps can cause overheating. I would change all of those above the top heat sink. Use Panasonic fm, or FC 105C caps from digikey. If for no other reason than to be safe.

[tom66]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

Adding fans is just likely to prolong the time till failure, it will probably stop working eventually.

[vinceroger69]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

in post 4 the yellow transformer to the right at the top the capacitor behind that looks like its been subject to heat and the outer plastic cover of the capacitor has shrunk those capacitors maybe your issue post 1 is a shopjimmy image edit truep beat me to it lol

[102mm]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

I have this same model. The standby voltage is pulsating between 2 and 4 four volts on the power supply. Matter fact, any voltage I measure pulsates on the power supply. Anyone have a clue?

[budm]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

I have this same model. The standby voltage is pulsating between 2 and 4 four volts on the power supply. Matter fact, any voltage I measure pulsates on the power supply. Anyone have a clue?

Bad start up cap in the STBY power supply? Too much load being drawn from the power supply?
How board good clear pictures of YOUR board?

[saddle_au]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

The caps above the transformer on the right (in upper middle of image ) don't look healthy.

[vinceroger69]

Re: LG DU-37LZ30 LCD TV Shuts off after an hour

The caps above the transformer on the right (in upper middle of image ) don't look healthy.

thats not his picture thats the original poster this user only joined the thread in post nine.