I have a philips 42pf7520d/10. it goes into standby mode when turned on. i have to turn off at the mains and then try again,this happenes all the time and now the tv wont come on at all. the red led light just flashes.it used to come on after a number of attemps but now it just stays in standby mode.is it cost affective to get it fixed or buy another one

Replace the main board. It will be the best. Electro help

check the ventilation it might be overheating.

Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Do a hard reset to this TV and check whether it help you. To make it a had reset, unplug it from AC mains wall socket, and re-plug it back after 10 minutes or so. If this do not help you, the main system memory IC to your TV must be replaced.

Try restting it by unplugging the tv for a few mins and it should rest to original factory default settings but leave it unplugged 10-15 mins to be sure.

Unplug the power for 10 mins. Try turning ON again. If the probelm is still there then, you need a new main power supply assembly

Hi.

The clicking noise and the leds on mean that there is an incorrect voltage value detected from the main controller board. When this happen we say that the main controller is forcing the PSU to standby, sending the set in protect mode.In protect mode only

The PSU can be tested bridging the low voltage control lines that are turning the higher DC volts from PSU on.

The procedure to test the PSU is illustrated in the following article. I wrote the article for LCD, but the procedure is more or less the same on your plasma. Simply disregard the part on inverter (plasma work in a different way and have no inverter or backlight system) How to test an LCD TV or monitor PSU

Bridging the voltage lines is a repair suitable for an experienced technician. If you are a DIYer, better testing the resistors and components near to the faulty capacitors by reading Ohms to check if they have continuity. This operation is done with power not connected.

If you need to replace the whole board, here the part number: POWER SUPPLY UNIT LJ44-BLAH101C PHILIPS. The part is temporarily out of stock, and may be available ordering from Philips.

Here the service manual: PHILIPS Chassis EP1.1U AA Service Manual.

sorry freind,i have a same problem..did you found someting? get me please

[1]pls check your tv set mains cabel or pin mostly plugh and mains suplay pin bitwin sparkig then tv set automaticly s.by mode and after sum min re start tv is on so pls proper canaction plugh and pin frist.
[2] secand problum is in side of your tv set pls checked driver transfermor or cancting spear
DT / suplay Ragistanse / capaciter

Replace the main PSU would be my first try.