TV WONT TURN ON, STAND BY LIGHT FLASHING 3 TIMES CONTINUOUSLY

When an abnormality has occurred to the unit, the protection circuits operate and set the unit to stand by mode. At this
time the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.

Fault maybe on the A board 3.3V SOS give me your email & i send you the full timing chart.

The T con board controls the picture. It has a problem and needs to be replaced. You can get the board from:
TV Parts Universal TV Stands DLP Chips ShopJimmy
You can replace this board yourself if you're not afraid to take the back off the TV.

ok, this may be a silly question but when you turn it on and it starts flashing red, have you tried pressing the stand-by button on the remote. if a tv has been put on stand-by by the remote, and is then switched off by the set, when the set is turned back on it is still in stand-by mode and you need to press the stand-by button on the remote.
other than that I don't know.

need the model number of the panasonic and also how many times it is blinking. The blinking is an error code.

Hard to troubleshoot with just this info, the red light can be helpful if its 10 blinks repeating over and over replace the power supply first then the A board. Voltages check on the power supply would narrow down the culprit.
Post again if you measure the power supply voltages

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771

Please count red light flashes and let me know. There would be long pause between flashes so count pause to pause. It is an error code of TV problem.

thats pretty normal, it takes a good second or two to warm up and the display to turn on(at least0, you get the green flashes as you hold for on, 1 sec is a long time at times, lol, be patient, no problem with your tv!

i have a toshiba dlp doing that after research i found it to need a lamp replacement

yOUR CRTS ARE SHOWING THE SIGHNS OF WEAR. ON THE FRONT OF THE SET BEHIND THE SPEAKER GRILL OR FRONT FACIAL. THERE ARE 6 CONTROLS 3 FOR SCREEN RED GREEN AND BLUE AND 3 FOR FOCUS RED GREEN AND BLUE. YOU CAN TRY TURNING THE RED SCREEN DRIVE CONTRIL COUNTER CLOCK WISE. JUST A VERY LITTLE BIT.

SOUNDS LIKE A FLYBACK PROBLEM AROUND $70.00 FOR PART