20 Most Recent Philips 42FD9954 42 in. Plasma HDTV Questions & Answers

The problem is in the standby power supply. the standby power supply generates the 9 volts and the 5 volts requird by the tv. If you measure the 9 volts source, with only the red light on, the correct voltage is 9 volts. However if the 9 volt measures 6.5 to 7 volts it is too low and the startup relays cannot operate. My set is a model 42FR9954/17S. In this set if capicator, 2603, is heated the voltage climbs to 9 volts and the relays work. If cold air is applied to the capicator the relays fail to operate. Replace capacitor 2503 and the problen is fixed. This capicator is: 47 Ufd, rated @ 450 volts, and is 20%.

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Check for bulged electrolytic caps on the power supply, then replace them, or replace the power supply.

Are you sure that it's a TV and not a computer monitor?? A monitor will not have a coax connector on it as it's made to connect to a computer..

Not a fix, but it got my tv on.
I removed the back and tried the power switch.
I located the relay that was clicking.
I have two blue relays in the middle of my power board.
I placed a hair dryer over the relay for a few minutes.
After four tries of the power switch and it stays on!!!!!
Heat keeps the relay from just clicking off.
I don't know why.
This will at least get the tv on though.

This is a error code more than likely a power issue. Check the power supply of the Philips web site for the error codes.

I repaired this model TV for a friend. The red standby LED would take about a minute to come on, and most of the time the TV wouldn't turn on even after it, and the relays would engage/disengage rapidly when it did try to turn on. After reading about the capacitor problems, but not finding any obvious physical issues with them (and not having a way to readily test capacitances) I went ahead and replaced all the Rubycon branded caps on the power board. This solved the problems - the red standby LED comes on immediately and the TV turns on like normal with a single click engagement of the relays. It seems the problem is just the low quality/defective/bad run of capacitors. I spent about $40 on capacitors at a local electronics supplier, but probably could have spent half of that if I hadn't wanted them right away and ordered online.

If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

Check its speaker. If found OK, check and replace damaged component/s at its audio output stage circuit. If you wish to get some details, check the site linked here. Pull up older posts.