Forum > LCD TV forum

Sharp 32" LC-32SH130K no power

(1/2) > >>

Todboy:
Hi All,
I have got a Sharp 32" LC-32SH130K, We had a thunderstorm and had a surge of electricity, which knocked out the main house fuse. Now the TV no longer powers up, the plug fuse was ok and the radial fuses on the power board are ok. I can't see any blown components on the power board. I would be grateful if anybody had any ideas.

Many thanks,
Tod

OldLes:
Tod, first of all, don't jump to conclusions. Sometimes after a surge, in no fuses blown, it may simply "work" after it has stood for 24 hrs. I happens to computers, and at the heart of every modern TV, there are many microprocessors hidden away.
Now, if it is a fault, look at any standby transformers for open circuit primary winding.
If it normally stays ON, (full on or in standby), then you may have dried up capacitors in the primary side, sitting waiting for the next "off", after which they do not have enough capacitance left to enable "start up". That used to be quite common with CTVs 20 years ago.
Make sure you discharge the main primary side capacitor, then go hunting for open circuits in the primary side.
Les.

Todboy:
Hi Les,
Thanks for your help, I will go hunting.

Thank,
John

downunder:
I don't wish to be a party-pooper, but in my experience with newer tvs that have suffered storm damage, spikes/surges usually leave the power supply unharmed and take out the main board. Hope I'm wrong in your case as main boards costs an arm and a leg.

Todboy:
Hi,
I'm not getting any voltage to the main board pins, so I think it must be the power board.

Thanks,
Tod

Navigation

[0] Message Index

[#] Next page