Try disconnecting all of your source devices from the TV and see if the line still appears. If the line disappears, the issue may be caused by your source device or your cables.
SOURCE: Plasma TV - intermittent blinking
Power supply failure. Either a capacitor went bad, or there is a loose solder joint near the big transformer on the power board. I would guess loose solder connection.
SOURCE: Panasonic TH-42PX60U PLasma - 1/2 screen blacked out
If the screen split is exactly 50/50 top/bottom You are not getting SU or Scan Upper drive.
These are lovely set to work on.
Most likely is SU board itself - Not repairable just to be replaced.
Sorry I work in the UK so I can only guide that the UK part is around £30
SU may have been damaged by failure if the PDP (Plasma Display Panel) but is 9 years only had 2 screens damage the SU board.
There are several setups to do after fitting a PDP. If you don't have the service data - Do not risk it, Reduced life of the Panel and a safety risk.
SOURCE: PANASONIC TH-42PX60U 42 - half of screen not working
I had the same issue. I am going to replace my scan buffer boards. The upper half of mine works but the lower half is black so I would replace the lower Scan buffer board but in case of future issues I have ordered both upper and lower for $44.
The scan buffer boards are fairly simple to locate. Open up back of tv there are two biffer boards identical. The item or product code on them contain letters either SU or SD (Scan up and Scan down)Look up tv parts and item code you will find a place to order or just get the 1 800 number from tv manufacturer.
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I had a repair man check the circuit connections for loose connections. He could not find the problem but determined it would be too costly to try replacing various components. It would be cheaper to buy a new flatscreen TV.
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