50" philips won't power on. get the 4x red blink led light

check this
The Service Default Mode (SDM) is a technical aid that can be used to display the your TV error code.
Follow these instrutions exactly to place your set in SDM Mode.
For sets that still have video do the following.

1. Turn your TV on
2. Using the original Philips TV remote press the following keys. Press each key for 1 sec then press the next.
3. From the remote press 0 6 2 5 9 6 MENU
4. You should now see the letters "SDM" in the far right hand corner.
5. If not do step "3' again.
6. To display the error code hit the "Status" button on your remote.
7. The TV can store up to "7" past errors.

For sets that have no video do the following.

1. Turn your TV on
2. Using the original Philips TV remote press the following keys. Press each key for 1 sec then press the next.
3. From the remote press 0 6 2 5 9 6 MENU
4. Wait a few seconds. The red power light should begin to blink.
5. The blinking sequence will determine the error code.
6. You will have one long 5 second red blink followed by the error code.

Note: On some sets the TV will automaticaly blink the error code when its powered up without having to go into the SDM menu. If you power light blinks after the set is powered up jot down the sequence.
Example Error Codes from the power light.
( RED 5 Seconds ) off ( RED 1/2 Sec ) off ( RED 1/2 Sec ) off ( RED 1/2 Sec ) = Error Code 3
Example #2
( RED 5 Seconds ) off ( RED 1 Sec ) off ( RED 1/2 Sec ) off ( RED 1/2 Sec ) = Error Code 12



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Error 46

Description Pacific 3


Detected by VIPER

Device T6TF4HFG


Error/ Prot E

These info are for qualified service technicians.

Before going OFF, the standby LED might blink. These blinks are fault indication. The number of blink should be counted. Count the number of blinks at one time, before the TV goes OFF. [eg: 4 blinks Power SOS P Board; 6 blinks Driver SOS 1 SU / SD / SC Boards
(SC energy recovery circuit)] and so on. you can get more details from this site named 'Electro-help'. You can reach it by searching the keyword "electronicshelponline" by internet.

Dont know if this will work for you or not, but my brother gave me his because of the same problem. It would power up and a green light would come on, then after 10 -15 seconds it would change to a red blinking light. I plugged a usb cable into the service port on the side and left the other end unplugged. Then plugged the tv back into the power. i took a small screwdriver and ran across the contacts in the end of the usb cable until both the red light and the green lights came on. I did this several times listening fot the clicking noises in the TV. after doing this for approx 20 seconds, i pressed the power button and the TV worked fine. 5 days now and no problems. Only thing I can think is I somehow reset the software and now it is working fine. Hope some of you can figure this out and give it a try. if the TV is just sitting, you have nothing to lose

The probleis with one of the maina boards and trouble shooting would have to be done to see which board is bad.

The SONY Owner's Manual for the KDS55A2000 does not state what the 4 times blinking Power LED means.

However, my Sony Extended Care Service support insists that the projection lamp is the cause for the 4X blinking LED
Power light.
I do not agree but am forced to buy a replacement lamp (not cheap) to prove that the problem is probably the fan, as the TV Technician states elsewhere in these FixYa support questions and answer

Yes you can first try this:. Red status LED, self-diagnosis error 44, check for open F9A06 on the Power PCB part # 283P128050 on the Power PCB 2. Red lamp LED, self diagnosis error 34. Check for 5-volts DC at J-9 connector pin 1 and 2 on the Engine Driver PCB if missing replace the Power PCB part # 930B921002 3. LED stops blinking after 70 seconds of plug in but will not power on. This model is equipped with a keyboard lock feature, this can be mistaken as a no power condition. To unlock the keyboard press and hold the "menu" button on the front panel for 10 seconds 4. LED stops blinking after 70 seconds of plug in but will not power on. Check for 3.2 volts DC at connector LE pin 3 and 4 on the Control PCB, if low suspect problems with the switches/buttons on the Control PCB part # 935D776001 5. LED stops blinking after 70 seconds of plug in but will not power on. Keyboard is not locked and key inputs at connector LE pin 3 and 4 check good. Suspect the E2P PCB part # 934C121001 6. LED does not stop blinking after 70 seconds of plug in. Disconnect the USB connector from the card reader to the front from the Chassis, if the unit will then boot up replace the Card Reader part # 299P271010. 7. LED does not stop blinking after 70 seconds of plug in. Disconnecting the USB connector from the Card Reader did not help. Suspect the DM PCB part # 934C116002

The most likely reason for the no picture might be the back light is gone and needs to be replaced, now as for the LED light blinking on different intervals is because its diagnosing it self unfortunately the user manual does not have any information on this part only by contacting the Phillips customer support you might get a better idea, but check your back light first it may just be that. Also try to check your Manufacturer warranty repair.

Any luck? I have the same problem with a 25"