They are flashing vertical lines in various colors as well as letters showing

What causes vertical colored lines on a TV screen? When a TV is showing vertical colored lines, a loose wire cable in the TV might be the cause. If you knock on the back of the TV, the vertical colored lines MAY disappear temporarily. This is a sign that a cable is loose or the T-Con board is faulty.

https://removeandreplace.com/2018/05/01/tv-has-different-color-vertical-lines-on-screen-how-to-fix/

have you tried to uninstall the last upgrade? Sometimes they're not working as expected

Here are some images that might help.

the actuall screen LCD is bad.
in most cases.
supper common failure.. 2008 PC.
see page 31 , part 5 here. bingo, change that out.
there are 2 types used, only your full PC part number on
the service tag show this, post that and we go to the HP parts surfer and look it up.

http://h10032.www1.hp.com/ctg/Manual/c01918142

Just replace the T-con board

more likely to be bad LCD panel (very expensive), but you can try replacing the LCD controller first (around $80~100).

hi i have a 50" magnavox that has a problem, i was looking at several websites and i find out the dirfferent posibilities.
in your case i have 2 posibble answers.
1) negative image
tv turns on and shots down in 2sec
flashing pixels on screen
dark image
has sound but no video
screen goes black and then return to normal picture
vertical color lines on screen no video
vertical color lines with video
vertical bars on screen
horizontal lines on the image
picture goes red after while
IT COLUD BE (X or Y or Z SUSTAIN BOARDS )

2) just left part of screen working
just right part of the screen is working
vertical and horizontal lines on screen
part of screen not working
some functions not working
no video but has sound
functions not working at all
IT COULD BE (LOGIC CONTROL BOARD)
TErry HerreRA

YPU HAVE A BAD PANEL. THE COST OF REPAIR WILL PROBABLY EXCEED THE VALUE OF THE SET.

Here is a picture of my TV problem, the green horizontal line is from the camera flash. thanks for the help.

Take your set to a qualified tech you have a bad vertical ic or some cap around the vertical section is not filtering the voltage properly and your deflection yoke could also be bad.good luck.