Tv will not turn on when tried on either tv or with remote green light flashes 3or 4 times then turns into red flashing light no picture or sound at all.Have tried changing batteries in the remote and fuse on the plug but its still the same.

I'd look at bad LED backlights

yes ill got remote link for u here give me one sec

https://www.youtube.com/watch?v=EanHoWLLpxU

MANUAL PROGRAM CODE SEARCH YOUR XR11 REMOTE TO YOUR TV:
1 – Turn ON the TV you will be using with the XR11 remote.
2 – PRESS AND HOLD the SETUP button (bottom left) on your XR11 remote until the LED status light (top of remote) flashes from Green to Red.
3 – Begin manual TV code search by entering 991 on the XR11 remote.
4 – The LED status light will flash Green 2 times.
5 – Repeatedly press the CHANNEL UP button on the XR11 remote to search through the TV codes.
6 – Keep pressing CHANNEL UP button on the XR11 remote until the TV you are programming turns OFF.
7 – After your TV turns OFF press SETUP.
8 – The LED status light on your remote should flash Green 2 times.
9 – Press the TV Power button on the XR11 remote and if the TV turns ON, your XR11 remote is programmed.
Be sure to hold the SETUP button until it flashes Green 2 times after your TV turns OFF.

Tv probally needed a new tv projection lamp.This tv has not been change it projection lamp like 1 1/2 or 2 years already?Tv been on and used it like 4 or 5 hours everyday?Yes,than the tv flashing or solid on green LED light is on have a word "LAMP" written on it tv bazel frame?Yes,tv 100% require a new tv projection lamp replacement.

Switch the TV on: Press the power switch A on the front of the TV. A green indicator on the front of the TV lights up when the screen is on. If the indicator is red, press the
-CH + keys on the remote control.
The green light blinks every time you press a key n the remote control.

Ref. link:
https://www.manualslib.com/manual/173137/Philips-29pt9420-69r.html?page=4#manual

If the lamp has been replaced I would think the Lamp ballast would be most likliest followed by the color wheel and then the Digital board. You can get any part needed for your model at www.tvrepairworld.com just leave them a email they respond quickly.

turn tv on picture comes up 2to3 seconds later tv blacks out then stand by red light flashes 4 times in a row repeatedly..can not turn on or off when stand by light starts flashing but before tv blacks out you can turn tv on and off repeatedly and picture and sound work.You have to unplug power cord for 30 seconds after stand by light comes on to get tv to turn on.

TV STARTS UP AND GOES BLANK SOUND NO PICTURE