Philips plasma 63pf9631d/63 has a dark screen and the colors are wrong and it will blink from light contrast to dark. what would cause this

https://www.shopjimmy.com/lg-lc500due-sfr2-led-strips-12-strips.htm

Just one of these can fail and cause the issue you describe.

Faulty T'Con board. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Plasma screens are extremely susceptible to getting broken from any impacts to the face of the screen. What you are describing sound very much like distorted or dead pixels. It may not be a fixable issue, you may have to replace the entire unit or live with the purple bar. The reason you don't notice it as much when the screen is dark is because purple is on the darker end of the spectrum, and will be most visible in contrast to lighter ad brighter colors.

Try ur contrast button some times this adjusted to much also if ur color adjuster is out this will cause same probs

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

42PF7320A: 7 blinks is missing 8.6VDC from supply -- connector CN-1M46, pin 3 (out of 11 pins), goes from power supply to main/input board.

don't need the manual for that the 6 blink code it the power supply

i had same problem. i took apart my tv and found there was debris stuck between the plastic push power button and the little sensor thing it touches. having it on it would randomly turn off. i adjusted it and it was fine. but now it just pops a fuse lol. hope it helps.

Could be a bad tcon or main board, below is the link for the manual if that helps
Philips 42 50 63PF9631D 37 Manual

Unfortunatly you are better off replacing it with a new TV.

You can have them repaired using a TV Repair guy but often it costs as much as a brand new tv. My daughter broke my $1,600 LCD. It would have cost $1,200 to fix.. so I just bought a new one.After that I picked up a TV screen protector called TV Armor http://www.tv-armor.com Its designed to protect the TV from damage. Now I dont have to worry anymore when she is playing near it. It works really well.

Eric