Old plasma help.

[R_J]

Re: Old plasma help.

The only plasma panel I ever saw with auto gen was LG

[Inssomniak]

Re: Old plasma help.

Still working on this TV a bit. Problem is not in the logic or main boards, and directly related to how hot the set is. Ive discovered that this panel has over 26 thousand hours on it via the service menus.. Pretty impressive if you ask me, but the problem *almost* goes away when the TV is hot, and I _believe_ its the panel itself that gets hot, and not any of the circuit boards, that causes the problem to virtually disappear.

Is it possible that the sparkly sections in dark areas could just be a worn panel? (sparkly only when darker colours are not a solid colour, solid single colours of any brightness are perfect)

Increasing the VA voltage makes it better, but I run out of adjustment space before I can dial it out completely.. Panel gets a bit brighter overall with the VA adjusted up.

[jjanssen7]

Re: Old plasma help.

I have had that experiences with older Samsung Plasmas. Feels like the panel just goes out of spec when they get up there in hours.

[R_J]

Re: Old plasma help.

The older panels do get sparkly with age, I would keep the Va close to spec and not change in more than 1/2 volt either way, Vs can be varried a bit more but usually keep it to +-5 volts of spec. These pos hitachi never had any real adjustments like samsung/lg etc. On those you can adjust the set_up & set_dn to get a better picture.

[Unspun01]

Re: Old plasma help.

Yes, panels are more prone to display "sparklies" as they age. Specifically, the sparklies are worse in areas that are more heavily worn (such as where a static image was displayed for long hours such as network channel logos or 4:3 letterbox or news tickers, etc). Sparklies are also often found in areas where you have bright image adjacent to dark image (such as dark clothing against bright white background, etc)

Older LG panels were particularly bad and had repair kits that advised complete replacement of ZSUS, YSUS and logic board with updated firmware.

R_J is correct - Sparklies get worse as age. Many LG panels I've worked on have VA and VS adjustments on power supply but also set_up & set_dn pots on YSUS. I've been able to get very good results cleaning up picture through those settings on older panels.

Never make these adjustments on cold TV.

Let TV panel warm up 15-20 minutes before adjusting picture quality since this is the normal operating condition of TV when you are watching it anyway.