Another 60PV250 pic fault but different this time. Help greatly appreciated

[jwarnes]

Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

No one has any clue??
No gurus??

[ReeceyBurger123]

Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

All the menu does it change the times between sustain pulses, are all voltages like Vsc running at the correct spec to the panel ?

[tom66]

Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

Increasing the brightness probably just moves pixel data between sub fields affecting how each subfield is balanced.

This is a z-sustain fault regardless of what the voltages do, there is no one voltage that controls the brightness. In fact on most plasma TVs the voltages will stay steady under 90% of picture conditions, only changing when the scene gets significantly darker (as subfields are dropped because of lack of picture brightness) or significantly brighter (as subfields are stunted by the ABL control.)

Some older LG plasmas would turn off Vzbias when the picture went black as you don't need it for priming, only for full discharge. But not aware of any modern sets that do this, due to the delay in pumping Vzbias back up (enough to cause momentary maldischarge)

[jwarnes]

Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

Yes all voltages perfectly stable.
Im going to try changing the fet driver controller chips (8 pin) next. Since the zsus boards are not available anywhere.

[jwarnes]

Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

Put the oscilloscope on the outputs of both zsus fet driver schips.
One is show busy square wave.
Other is a flat line. Assuming the flat one is faulty.
Ordered a complete repair kit. Will post results later.