LG 42PQ20 No Standby Voltage

[kmoonen]

Hi Everyone

I have a LG 42PQ20 with no standby voltage, obviously a power supply problem, but i am having trouble narrowing it down , anyone have a similar issue with the power supply (3PAGC00001A-R)

Ken

[newtothis]

Re: LG 42PQ20 No Standby Voltage

Voltage at primary filter cap?

[tom66]

Re: LG 42PQ20 No Standby Voltage

Input fuse good? Pictures of board?

[kmoonen]

Re: LG 42PQ20 No Standby Voltage

Both fuses are ok.. here is a picture

[newtothis]

Re: LG 42PQ20 No Standby Voltage

Whats the voltage at primary cap?

[tom66]

Re: LG 42PQ20 No Standby Voltage

Pretty common fault with these is IC301.

[kmoonen]

Re: LG 42PQ20 No Standby Voltage

Ok, im not seeing IC301 on the board

[newtothis]

Re: LG 42PQ20 No Standby Voltage

Check on the heatsinks

[kmoonen]

Re: LG 42PQ20 No Standby Voltage

Found it, Checked it and it is bad

any sources online to purchase?.

[kmoonen]

Re: LG 42PQ20 No Standby Voltage

Does anyone know where i can purchase one of these ?

[kmoonen]

Re: LG 42PQ20 No Standby Voltage

Ok I have replaced IC301 - STR-W6252. I have 2 more components that are short, R305, and ZD303, does anyone know the values of these 2 components

[kmoonen]

Re: LG 42PQ20 No Standby Voltage

Resolved.

Replaced IC301, R305, ZD303, D305, C307.

[TomasNM]

Re: LG 42PQ20 No Standby Voltage

Hello.
I have the same problem.
Can you please provide the values of additional components,those you've replaced?
Thank you,Tomas.

[abdekader]

Re: LG 42PQ20 No Standby Voltage

check these components

F301
F302
IC301
R305
ZD303
D305
C307 (33u or 100 u)

[Flubbah]

Re: LG 42PQ20 No Standby Voltage

I have the same problem with the same parts needing replacement.

I am not abale to track down a parts list of the components that I need to order.

Can anyone help me out ?