Sanyo 40" LCD TV 40xr11f blown power supply

[mikoz]

Gday,

Was handed this LCD after the guy tried fixing it himself. Symptoms started with a buzzing DPDT switch, sometimes would start up fine other times the red led would flash and not come out of standby. The owner decided to replace the DPST switch with a SPST switch by twisting the same coloured wires together and POP goes the TV. Long story short, the psu now has burnt traces between the plug socket and the switch socket (which I have soldered in wires between). I do not want to do further damage to this board by powering it up but the fuse tests good still.
How would one start testing this board before applying power to it?
PSU model is 8KI0132010 A1 1141

Cheers
Mick

[budm]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

Pictures?

[mikoz]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

Sorry about that, will get some pics up this morning.

[mikoz]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

Heres some pics, dodgy solder I know...

[mikoz]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

Update:

TV now working, Replaced dp switch and wiring to psu (high resistance), 3 x 16v 1000uf caps on standby circuit & the red 5a radial fuse and voila job done.

Mick

[tw2005]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

Just picked up same model. symptom described was would not turn on, flickering standby LED. Got it home and dead as, no standby LED. Did not bother checking voltage, grabbed a hair dryer and warmed everything up and eventually standby came back, could not turn on,more heat, turn on via side panel - no remote operation and eventually everything now works.

so definitely bad dried out caps I'd say, just not sure if only on the PSU but I think a full recap of the unknown crap branded caps is a good path to take.

can't get it to fault again, see what happens overnight leaving it off.

[tw2005]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

Just picked up same model. symptom described was would not turn on, flickering standby LED. Got it home and dead as, no standby LED. Did not bother checking voltage, grabbed a hair dryer and warmed everything up and eventually standby came back, could not turn on,more heat, turn on via side panel - no remote operation and eventually everything now works.

so definitely bad dried out caps I'd say, just not sure if only on the PSU but I think a full recap of the unknown crap branded caps is a good path to take.

can't get it to fault again, see what happens overnight leaving it off.

LCD-40XR11F

Did not fault left off overnight, recapped the PSU and not super confident if that's good enough. The main feeds the IR board which has the standby LED. probably would have been smarter to measure things whilst it was faulted.

There's no 1000uf 16v caps i could find that the OP states.

Could not get any hits for the samsung panel LTA400HM09 or LJ96-05566C. TCON is integrated, PSU heatsinks and entiire LCD chassis get quite warm(hot).

There's a hotspot 1/3 from the bottom right across the rear so hot a few seconds is uncomfortable. is the norm?

last pics are of panel failure from the websearches.

I thought the big plus with LCD was less power and heat

Australian NZ models

http://cncms.com.au/index.php/sanyo-service-manuals

[tw2005]

Re: Sanyo 40" LCD TV 40xr11f blown power supply

I have a suspicion the OP is talking about 100uf 16v surface can caps on the main