50ps6000

[thuss]

Hi

Ive just changed the 3 mosfets, 1 zd (5.6v), 1 ohm resistor on a z sus board for a 50ps3000.

The tv 50ps6000 as far as I can tell is basically the same as a 50ps3000 but with a different fascia.

When the tv turns on the screen is really white with the menus hazy accompanied by a high pitched buzz.

I have checked all the voltages and they seem to be alright apart from the vzb on the z sus which is 198 voltages. When I try to adjust the voltage turning in either direction clock or anti clock I still get 198 volts.

I thought the vzb should be around 105 volts?

Any help would be appreciated thanks in advance.
(btw I still get a pinky picture but what I have noticed as soon as I unplug it, as the voltage drops it goes normal for a second i.e black background with a normal menu displayed)

[thuss]

Re: 50ps6000

I put the following mosfets 20nf20 in positions q13 and q14.
51n25 in q15, I put a insulating pad with a insulated screw with it.

[tom66]

Re: 50ps6000

The Vzb FET is probably shorted, Q13 from memory. It is a linear reg for Vzb supply.

[thuss]

Re: 50ps6000

ok thanks I will replace that later.

One last thing the grey voltage adjuster next to these mosfets can they be replaced (like for like) because I applied a bit to much pressure and its just completely rotating? I can get it of another lg board

[tom66]

Re: 50ps6000

That might be causing the fault. You need to replace it with one of the same spec, should be printed on the back of the device. Different value might not work - can't guarantee it, at least.

[thuss]

Re: 50ps6000

thanks tom66 it was q15