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.
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