LG Plasma turning itself off and then on again

Yep i will be trying it out as soon as i get in, i wont hold my breath as it sort of looks like a hardware fault to me, but mad_allans story certainly makes it worth trying.
 
That sucks, hope you get somewhere with one of these bunch. Even though you've said it's over 2 years, I still don't think it's acceptable for such a high-value item.
 
Thanks, i will keep at them next week when i get a quiet moment at the office :)

I opened the TV up today to take a look, unfortunately i cannot diagnose the issue, everything looks spot on (no blown/bulging caps etc) :(
 
When our Panasonic GT50 did the same it turned out to be the PSU. Once that was changed it was then perfect. Panasonic diagnosed it from the video that I sent to them showing the issue.
Thankfully I had bought it from JL and it was still within its five years warranty.
 
If all else fails the PSU will be my first port of call then :)

Annoyingly i cant see anything wrong with it, i almost wish it had obviously blown caps to at least confirm where the fault lies.
 
Samsung had/have a lot of problems with dying caps on the power board, symptoms were usually a failure to power on, your problem sounds power related so I'd look into that. I bought a replacement board off Ebay once and it fixed it.
 
Ok, so the TV doesnt seem to have any fault if ran with the case back left off. This would have to indicate overheating and a safety threshold which is cause a power down rest period...would everyone agree?

The power supply is the only item within the TV which seems to get very warm other than the screen itself.
 
Sounds quite possible.

For those mentioning SOGA, I believe you can only go via this route if you can prove an inherent fault. Meaning you'd have to pay for an engineer to test your TV and confirm that fault will likely have existed from manufacturing and hasn't just developed. Have a check over on MSE's consumer rights board, there's always lots of threads on faulty TV's.
 
Jez said:
Ok, so the TV doesnt seem to have any fault if ran with the case back left off. This would have to indicate overheating and a safety threshold which is cause a power down rest period...would everyone agree?

The power supply is the only item within the TV which seems to get very warm other than the screen itself.
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Sounds that way. I see this happening a lot in work during summer months with inverters enclosed in cabinets overheating yet work fine during winter months. Actually not much different to some PC issues where people have removed case panels or added extra fans.
 
Semple said:
Sounds quite possible.

For those mentioning SOGA, I believe you can only go via this route if you can prove an inherent fault. Meaning you'd have to pay for an engineer to test your TV and confirm that fault will likely have existed from manufacturing and hasn't just developed. Have a check over on MSE's consumer rights board, there's always lots of threads on faulty TV's.
Click to expand...

Over 6 months, that's true, yes. But it depends on what the burden of proof is, and to what degree the retailer wants to argue it.

If taking the case off means it starts working, that sounds like something inherent to me. And if there are more examples of other users who've had the same experience, then that's a stronger case.

On the plus side, at least we know what the problem is now!
 
Ive still not done anything about this as it is working flawlessly with the case back off :p

I will have to order a PSU i think, its not worth getting engineers involved and trying to build a case for a complaint - a PSU is £15 on ebay :p
 
Just finally got around to fixing this properly the other week, so thought it would mention it in case anyone googles this issue like i was.

I bought a PSU, swapped it, no difference - kept turning off and on when it got warm. Luckily the PSU was only about £10 from eBay so a cheap fail there.

I then obviously started looking at the other boards and noticed that the heatsink on the processing unit of the main board (AV board) was quite loose, and cold to the touch. Seemed odd that there would be a heatsink on a cold chip. Upon closer inspection the processor was burning hot underneath this, with a visible air gap and no thermal paste between the two. This tiny heatsink was only held on by some old rubbery glue stuff, which had gone brittle and i guess had given way over time.

Long and short, i ripped off the tiny heatsink on the processor, and hot glued a much larger heatsink onto it, which i pulled from an old ATI radeon graphics card. I made sure to use a nice amount of thermal paste from a PC CPU.

Perfect ever since, the new heatsink gets luke warm at most :)
 
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