Pulsing/strobing on black screens or dark backgrounds
I have a 3 year old Sony Plasma (PFM 42V1) and there is a noticable "pulsing" or "strobing" on any all black screen or dark scenes in movies. This is present on all inputs. I have checked all connections and they appear in good order. Any advice?
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Re: pulsing/strobing on black screens or dark backgrounds
It is very likely that there are electrolytic capacitors going high in ESR on the processor and driver boards, and also in the power supply areas. The tech should be able to see this by monitoring supply distributions with a scope.
Depending on the complexity of changing the caps on the boards (if it is actualy a cap problem), the best choice may be board replacements.
In almost all the cases where I had this type of fault, it was a number of capacitors that had to be replaced.
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Unfortunately it sounds like the video processor or a capacitor inside the TV has started malfunctioning, causing the vertical lines. I recommend contacting where you purchased the TV from and ask for help regarding a repair or replacement if it's still in warranty.
I have a Sony PFM-42v1 and it does the same thing, look in your tv menu for picture inversion, usually under screen saver. What it actually does is reduce the chance of screen burnin. By reversing the image it sort of resets the hot areas, brightest colours and the cooler areas being dark colours, switches them around ( negative ). This cools the hot spots and heats up the cold spots.
There should be a option to turn it off, mine and I guess yours as a default is ON, mine has the ON, timer and OFF options.
Hope this helps, please let me know if you need more info.
The Sony Plasma designe not to repair at component level your problem I believe in YSUS PCB you can adjust a few variables resistors on this PCB make sure to mark on the spot before turn you can alway go back to original point, set your plasma on normal channel turn the variable resistor slowly and observe the picture any spot will effect the picture if you can not adjust you need to replace a new PCB
Let me know how you go
If you are lucky, it could be an open resistor or defective IC. Otherwise, I see a new TV in your future as the Plasma display would cost nearly $5500 for the part alone. If the fireplace is used much, I would not mount a TV above it, especially a plasma set which generates a lot of heat all by itself. If the fireplace is only used occasionally and you want to put the replacement set in the same spot, then I would consider a LCD model instead.