samsung ps50q96hd picture keeps turning off then turning back on its not psu as repla

[wreksta]

hi any advice on my problem
its not psu as replaced that board with know working one I ttried different main av board and does the same after a while

I checked voltages
and vs was low so tunned it to the panel spec 207v but when measuring the va my meter tells me its on 15.00and not 65v


any ideas hope its not y main as have none spare I do however have a load of ldvs boards and z sus boards

[freakaftr8]

Re: samsung ps50q96hd picture keeps turning off then turning back on its not psu as r

Check supply voltages with ysus and Zsus disconnected and main still connected. On sustain boards the VA is just passive. Goes directly to x buffers on the bottom of the panel. Hopefully your panel is not shorted loading down the VA circuit.

[wreksta]

Re: samsung ps50q96hd picture keeps turning off then turning back on its not psu as r

the 50 screen was roasting hot from the rear

and I could not use pc with screen shutting down so took psu from 50 put in a 42 same model make and the va still down its at 12.5 as I turned it from 15v at the mo with a bad image but no shut downs yet

so it may be psu then but what loads down va on psu

now my meter is running low but still measures the vs could be a a low battery problem on meter im going to see how this fares out on the 42 if its fine going to up the va to 15v again so picture gets better

on a side not say I was getting wrong reading from meter due to battery

would a high va heat the screen to really BLOODY hot and cause the shutdowns

[tom66]

Re: samsung ps50q96hd picture keeps turning off then turning back on its not psu as r

Va at 12.5V, are you sure? Maybe you mean Vg?

[wreksta]

Re: samsung ps50q96hd picture keeps turning off then turning back on its not psu as r

hold on let me check

edit no mate 12v then I adjust the va adj pot and it will rise to 15 only

edit tom im a plum or tired yes that's vg but why does va pot rise that voltage

ill adjust and recheck all

it came into me like this where pic would go off and you could no longer here the y main buzzing
then come bk on with picture but tv did not enter standby or click

[tom66]

Re: samsung ps50q96hd picture keeps turning off then turning back on its not psu as r

I think Va and Vg are on same transformer. Adjusting one causes other to change.

Be absolutely very careful to set Va exactly to panel sticker.

The panel would definitely NOT work with a Va of only 15V, it would just be mal discharged (weak, sparkling image) or no image at all apart from glow screen.

Va is around 50V to 75V.

If set too high, it's easily possible to kill the plasma panel. So be VERY careful while doing it!!

[wreksta]

Re: samsung ps50q96hd picture keeps turning off then turning back on its not psu as r

right going to recheck everything and report back had no issues with power board in 42 so far so we will see I may have had the va to high