Sharp AQUOS LC90LE6570 Lightning Damage

[crees]

I have 3 tv's on of which is a Sharp LC90LE6570. I am trying to troubleshoot what parts I need to repair or just replace. I assume the power supply board and or the logic board are going to be the ones with damage.

First I do not get indication of power and no standby light power or anything... zilch with the tv plugged in. I tried to volt meter power pins on the logic board and I do not see any voltages. So over to the power supply. Fuse is good and getting rectified DC voltages over to the relay section of the Primary power side. I do not get any power readings on the pin headers going to the Logic board including the STB pin 24.

So my assumption is Power supply standby power circuit needs more attention. Anyone here have experience with this scenario and if so any direction you would recommend. I do see some power supply replacement parts online that I can buy to replace and most likely thats what I will end up doing.... but figured I would post it here to see what you guys think.

[dskall]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

What is voltage on main cap?

[petehall347]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

fuses ok ?

[dskall]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

You have an ic on back of power board that seems to control everything. Need to read # and try to find data for it.

[crees]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

What is voltage on main cap?

The first Cap it hits (Blue Ceramic?) is registering ac 120v. The two largest caps on the same Primary Power side of the board are measuring 165v DC.

[crees]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

You have an ic on back of power board that seems to control everything. Need to read # and try to find data for it.

Will do. Probing the larger Caps near the main chip are 0v.

[crees]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

fuses ok ?

Yes main fuse is good. As far as any other fuses (surface mount?) is there any more I should be looking for?

[dskall]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

I found no schematic or repair kit for your board. I think your best bet is to get number off of chip on back and hopefully find info on it. Budm or someone else may have to help you. I am not good at tracing out circuits.

[crees]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

Here is some readings. Just probing around. Trying to see where standby current is coming from. Also is 165V DC a correct voltage for this board?

[dskall]

Re: Sharp AQUOS LC90LE6570 Lightning Damage

165v is good in standby