Lcd40883f1080p

[sordids999]

got this tv today keeps losing sound every now and then

PSU 17PW26-5 V3 250711

MAIN 17MB62-1 V1 210411

i cant find a schematic to check voltages or is it the same as 17pw26-4 ?

thanks

[sordids999]

Re: Lcd40883f1080p

on searching around it seems IC u168 when its faulty and gets hot it will cut out the volume anyone else experienced this ?

[tom66]

Re: Lcd40883f1080p

Common fault on these... requires a hot air gun to remove (has a thermal pad soldered on bottom of IC)

[sordids999]

Re: Lcd40883f1080p

http://www.ebay.co.uk/itm/17mb62-2-6...item232d1f194f

will this work tom ?

and yet again another tricky IC

[tom66]

Re: Lcd40883f1080p

No need to spend that much:
http://www.ebay.co.uk/itm/TPA3113D2P...item4ad7570897
http://www.ebay.co.uk/itm/TPA3113D2P...item1e8d61e13e

You will NOT be able to remove this without a hot air gun (at least, not without destroying the board)

[obelectrons]

Re: Lcd40883f1080p

Replace IC U168, or build a small sound circuit for the sound , if u happen not to get the same IC

[Caleb]

Re: Lcd40883f1080p

Maybe I'm out of my element on this one but wouldn't it be easier to add a heat sink to the top of the chip, or is it done for by the time it starts cycling with the heat?

[tom66]

Re: Lcd40883f1080p

Maybe I'm out of my element on this one but wouldn't it be easier to add a heat sink to the top of the chip, or is it done for by the time it starts cycling with the heat?

No, it'll only hide the problem. The chip has obviously suffered internal damage and will fail completely soon. Besides they don't run very warm in operation - maybe 10~15 degrees C above ambient - so the heatsink would have to be bloody good to stop that rise from occurring.