Ltv- 32w6 hd - shutdown 30 after back lights come on - and no video no sound

[jackslater]

Westinghouse Ltv- 32w6 hd

Comes on , lite back lights, icon goes blue then shutdown in 30 seconds , looses 3.3v on main board, no picture , no video .

With the invert unplugged and t-con unplugged Comes on , lite back lights, icon goes blue then shutdown in 30 seconds , looses 3.3v on main board, no picture , no video .

It points to main board.
It loosing 3.3v start volts and come when set is restarted.

power supply has all volts okay have 12volts 5 volts and 24-


any have any details about main board problems
part number #5600600266

[retiredcaps]

Re: Ltv- 32w6 hd - shutdown 30 after back lights come on - and no video no sound

1) Check if you have 5V standby?

2) If yes, check every voltage regulator on the main board. The regulator may have a part number like AS1117-33 where the suffix tells you the correct output voltage (3.3V in this example).

[jackslater]

Re: Ltv- 32w6 hd - shutdown 30 after back lights come on - and no video no sound

well , while testing the power supply died yesterday. no low voltages any where lamo
mfg part # 4900253180

i only have high voltage power to rectifier then first of to ( two) - p20nm50fp Mosfet
i looked spec/ data sheet} up .They *seem to test okay * - but seem like second of p20nm50fpis in series is not getting power - both test same out of circuit. This feed to the primary transformer.
all diodes and resistor test - good
Have zero on secondary diodes the 12volt diode transistor part # E83-004 and 24 v power transistor part # stps40h100cw

[jackslater]

Re: Ltv- 32w6 hd - shutdown 30 after back lights come on - and no video no sound

Got supply working maybe
i have 5 volts and 3 volts on power supply
the front led lights blue
main board has 5 volt - near power white connector- but dose not go any where to a cap and is no traceable after that.
In 3 volt at bottom - near the power button connect
i can not get the power supply to switch on for 12v on 24 volts

any help would be great
thanks

[jackslater]

Re: Ltv- 32w6 hd - shutdown 30 after back lights come on - and no video no sound

Well bought a new main board - LOL-

Now i have sound , back light . No picture or menu- problem now
Going try to hook up to different video source-

Just got my Toshiba going - so happy for that- offer to buy a dead Sony

Any thoughts - current problem where to start