Fujicom LCD LC3201 No Power

[s_henya]

Re: Fujicom LCD LC3201 No Power

hey budm,

the zener is: Z4, taken it out for now...
fets are: Q9 Q8
FSU diode is: D3

thanks for your time and help!

[budm]

Re: Fujicom LCD LC3201 No Power

OK thanks, I need more pictures.
A straight shot of the bottom side, and 1/4 section picture of the bottom side. i cannot really tell yet how those two MOSFETS are used in the circuit.

[budm]

Re: Fujicom LCD LC3201 No Power

Here is the SCH, not sure if it is 100% correct.

Q6, Q5, and the IC2 may have been damaged when the MOSFETs shorted out the first time.
If the outout GATE drive of the IC stuck on high instead of switching at high frequency, Q8 and Q9 may be fully on instead of swithcing, that will blow up Z4 and may take out the Source low Ohms resistors also. I have a feeling IC2 is bad.

[s_henya]

Re: Fujicom LCD LC3201 No Power

im not sure i understood what pictures you needed,

q6 don't look too good visually, but its not shorted, i already took it out for testing.

any way i can test IC2:
RG33
MC0628R

(all psu costs 40$)

it was a mistake trying to revive this PSU, it was cheaper to buy a replacement.

but that's old news...

should i carry on?
(order ic2)

[s_henya]

Re: Fujicom LCD LC3201 No Power

Updating: i gave up on the old psu, ordered a used one from Aliexpress.

The TV is working again!