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This is common to all old plasmas, the vertical scan module isn't getting enough power.
Long story short - you're going to need to remove the back panel of your plasma tv, turn some knobs, and watch your annoying pixel storm slowly dissipate. What you're looking for are little knobs that control various voltages. Most are these are shaped to be turned with a Philips head, and are sometimes marked with little clicks around them like a clock. If you get a flashlight and look, there's a description printed on the circuit board that tells which voltage that particular knob controls. Almost all of the tv's i've heard of being fixed need to have the VSCAN, or vertical scan adjusted. Make the adjustments in small steps and wait for a result.
They mean... Vs = usually to do with Volts, usually denoting Vss, or Ground... Can also mean Voltage on the Source of a FET transistor. Vscan, = Scan Voltage. Vset, = Set the Scan Voltage, Ve, = Voltage again usually Vce meaning Positive Volts,. Can also mean Voltage ON the Emitter of a Transistor. But unless one can see the place in the circuit on the schematic, it is hard to tell.
Yes the diffusion problem on your tv is due to the pdp panel aging. What you can try is readjusting the VSCAN voltage, there is a test point marked VSCAN using a DVM you can first check the voltage, should be around -- 190 turn the adjustment counter clockwise this should reduce the voltage, watcthing the picture turn control untill the sparkling pixels stop. That should do it. The panel is starting to age this may occur again until you can't adjust it out meaning a bad panel.
Pixel misfiring (diffusion errors) are caused when the tv is not firing and erasing the pixels correctly. It can be caused by a number of things, usually a voltage or waveform is off somewhere. If you just bought the tv, return it and get another. If you are out of warrany, you can remove the back panel and run the tv to check the voltages. Don't touch the heatsinks! they're electrically hot and will zap you.. the voltages are labeled on the back of the plasma panel with a sticker. first check Vs and Va. sometimes you can check -Vy, Vset, Vscan and others if labeled on the board. If you have to adjust waveforms you need a very $$ o-scope and should get qualified technician to adjust. If a board is bad, its likely your power supply or Y-sustain pcb, and less likely your Z-sustain or contol (logic) board.
If you adjust v-scan make sure you adjust it for the setting that is marked on the panel when you take the back off. Why do you want to adjust v-scan? are you noticing red pixels firing or green ones? This is a diffusion problem and i am familiar with the fix for that. Let me know and we can go from there. Also what is the version of the HP-R5052? Talk to you soon . Thank you Jay
some of these panels were mis-calibrated from the factory after not aging long enough. Let the TV run for atleast 2 hours and adjust the Vs and Vscan voltages. When it is blue in the left I have found generally the Vs is about 10 volts too high.
You need to adjust the panel voltages, adjust the VS voltage to around 186 volts, if that doesn't change it then adjust the V-Scan voltage down, turn the unit on and apply a video source to it, and while adjusting the voltages look at the screen and you should be abe to watch the video noise fade out.