It's most likely a bad main board. You can probably find one on ebay, and find a how to replace video on you tube.
SOURCE: tv. does not turn on sometimes? philips 63pf9631d/37
The TV is in some kind of protection mode, the blinking LED show you an error code.
Try pressing 062596 and then press menu button (do these in quick
motion, don't let them to time out while keying)...see what happens
Well I think that if you would have a service manual for this set that
would help a lot, I can send it to anyone who wants it via email/gmail.
Let me know if anyone want one.
I also heard that this problem appeared with some people because the of
the burnt fuse in the TV. To fix that it has to be taken to the tech
shop. 
And yes I also heard about this issue many times, seems like this TV set is very popular with this kind of problem.
SOURCE: Philips flat screen TV MODEL ID 19PFL5422D/27
I bought the television less than a year ago, so I called Philips Magnavox and they asked for the serial and model numbers. Next thing I know they asked for my name and address and Philips is sending a brand new television to replace it !!! The new one should arrive in about ten days. How's that for service? I'm very happy that I bought Philips and I will do so again. So don't forget to keep all the paper work that comes with your new televisions,especially Model and Serial numbers ! Thanks for asking , Debbie Hoffman
SOURCE: Red LED blinking after turn on the TV (Philips Plasma 42PF9631D
The TV is on protect mode.
Try first leaving the TV power cord unplugged for some times, let say one hour or so.
Also
ensure that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem with no receiver box
or dvd connected.
If that does not work, and you keep having a flashing
led on front of the TV, and tv turning off by itself after a while,
that indicates a fault condition.
The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.
1The
internal circuits are jammed because of electrostatic
charges accumulating on capacitors, or because of a wrong voltage read
by the main chip on your monitor controller board. this started the
protection circuit.
2 The protection circuit detected a wrong
voltage or abroken contact, identified an internal fault and kicked in
, startingthe flashing light.
If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.
If you are in situation 2 , then there is an internal fault.
Common faults
that can occur are a blown capacitor on power board, a
convergence IC has blown, or a fault on Digital board.
Check also
the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you
can get same flashing state because of the video cable.
If under warranty contact the manufacturer ringing the number on the user manual
If you want to repair at your own expenses, just locate any good qualified repairer.
SOURCE: Syntax Olevia flat screen tv video goes off then on
Hi, Replace the bulging capasitors on the main power supply board. Thanks.
SOURCE: My philips flat screen 42PF55 tv keeps turning itself off. The gr
Hello,
This issue is related to a power problem in as much as the TV turns off on it's own.
The problem is consistent with overheating on the power supply board of the TV. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby making it to misbehave.
The power supply board of the TV has few capacitors and IC. If any of these IC's gets short or become weak, it can cause the TV to turn off on it's own.
When current passes from electric outlet to the power supply board of TV. The current also goes to the weak/faulty part, then the current stops or slow and the board overheats and TV shuts off on it's own.
To solve this issue, check the power supply board and read it with a meter and continuity tester, in order to detect the faulty part and replace the faulty part on the board which is short due to which power supply board
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board from www/shopjimmy.com to save you some stress.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't have the ability to read the fault, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.
I wish you the best of luck.
Regards.
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