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Equipment Repairs => PLASMA TV forum => Topic started by: MarkZ on January 19, 2013,15:19:46

Title: Schematics for PSPU-J704A for an LG tv?
Post by: MarkZ on January 19, 2013,15:19:46

Hi.

I have a LG 42PG6000-ZA.  (Manufactured 2008)

Sometimes it starts full up but lately it gets stuck more than not in blink mode (red/green on power on) and increasingly so.
It does so even when it hasn't been on for a day.
When it actually starts it works fine for hours (til I turn it off).

I exchanged 4 pieces of 3.3mF capacitors that was bulging on the PSU board, but no change.

Anyone has a manual for that model or an idea where to look next?

Thanks, Mark

Edit:
Changed the headline.

Title: Re: Manual for LG 42PG6000-ZA? Power Led blinking red/green.
Post by: MarkZ on January 24, 2013,12:36:46

More info:

I replaced the capacitors with red circles because they were bulging.

Now I noticed that the component in the corner (blue circle) looks like it have been warm.
It says VA101. What is it and how can I tell if its broken?

Title: Re: Manual for LG 42PG6000-ZA? Power Led blinking red/green.
Post by: MarkZ on January 24, 2013,12:38:45

Is there an easy way of telling if it's the PSPU-J704A (PSU) that is broken?

Title: Re: Manual for LG 42PG6000-ZA? Power Led blinking red/green.
Post by: t1412 on January 25, 2013,02:53:42

hi, mark look like a varistor, you can heat them up and test with a mulitmeter, look on youtube


regards
shaun

Title: Re: Manual for LG 42PG6000-ZA? Power Led blinking red/green.
Post by: MarkZ on January 25, 2013,11:24:38

Thanks for your answer.

Now I'm looking for a schematic for the PSU so I know what specs the component have, to exchange it.

Any ideas where I might find one?

Br, Mark

Title: Re: Schematics for PSPU-J704A for an LG tv?
Post by: t1412 on January 25, 2013,11:53:38

try, rs components or wiltsgrove good luck

shaun

Title: Re: Schematics for PSPU-J704A for an LG tv?
Post by: tv tony on January 25, 2013,12:02:35

you will be very lucky to get a service diagram for the psu, ysus and zsus boards are never shown, it may be cap problems, you are going to be better off getting an esr meter to check them, they dont always bulge when they are defective. good luck
tony walker