Sharp led lc-40le653u no power

[crdz66]

Hello everyone.

I need you value opinion.
I have a tv from a friend that fall to ground and now doesn't turn on.

So far i check the connections on ps and i get 19v on connector cn02 on pin 1,2. (this connector doesn't show standby pic)

on main board i have 5v present on connector coming from power button. But, as soon i pushed, voltage is not present on pin going to ps on/off.

So main board is bad???

Thanks

[dskall]

Re: Sharp led lc-40le653u no power

Have you tried with a remote? Should be a voltage change when you push button at connector that plugs into mainboard from buttons

[crdz66]

Re: Sharp led lc-40le653u no power

Yes like you see on pic 4. Voltage drop from 5v to 1.17volts once push the power button.

[dskall]

Re: Sharp led lc-40le653u no power

Need to check voltages on mainboard. Was there any damage to tv?

[budm]

Re: Sharp led lc-40le653u no power

No hair line cracks on the power supply board for sure?

[dick_barton]

Re: Sharp led lc-40le653u no power

Have you checked all the 0 ohm resistors on the mainboard top and bottom are not open circuit.

[crdz66]

Re: Sharp led lc-40le653u no power

I will check. Thanks

[crdz66]

Re: Sharp led lc-40le653u no power

dump question.
ps_on (3.3v) on sharp led tv is generate on power supply? or coming from main board

[dskall]

Re: Sharp led lc-40le653u no power

Unplug connector what voltage do you get at ps_on?

[crdz66]

Re: Sharp led lc-40le653u no power

0 volts

[budm]

Re: Sharp led lc-40le653u no power

The PS-ON comes from the main board.

[Dgtech]

Re: Sharp led lc-40le653u no power

Just throwing this out there. I'm thinking, since this was a fall, like bud said, Hairline crack or broken solder joint somewhere. Transformer maybe? Connectors?