is there anyway to fix a main board?

[mattstolte]

I have this lg 55LH90-UB AUSVLHR. wont power up. has the standby voltage but no pwr_on voltage so my theory is the main board is bad. its main board
EBU60695001. I tried to find one but there is none available and shop jimmy had it priced at 175$ but didn't have any. but I still would like to know is there anyway to fix these? I have never done such a thing, I cant locate a surface mount fuse anywhere

[mattstolte]

Re: is there anyway to fix a main board?

Anybody please

[budm]

Re: is there anyway to fix a main board?

Did you try pushing that switch (TV plugged in) by the barcode sticker to see what happen?

[mattstolte]

Re: is there anyway to fix a main board?

Yes, there are 2 switches. Tried them both no luck

[newtothis]

Re: is there anyway to fix a main board?

Without a schematic its going to be very difficult

[selldoor]

Re: is there anyway to fix a main board?

If you can find the PSON pin work back from there and see if you can find anything faulty.
Test voltage regulators and test for voltage on caps are easy tests.
Zero rated resistors with a 0 on are often used as jumpers but sometimes have a fuse function.

[mattstolte]

Re: is there anyway to fix a main board?

the bottom pin is the pwr-on but I wouldn't even know where to begin or how to trace a line? I don't even know how to test these things so if anybody can tell me what to put my meter on when checking them?

[stj]

Re: is there anyway to fix a main board?

check the power at the main cips,
check the crystals are oscillating.

if that's good, probe the eeprom/flash to see if it's being read at powerup.