Question about Philips 42FD9954 42 in. Plasma HDTV
The DC power relay will not energize when the on button is pushed. I have two monitors that act this way.
Have made some ac and dc voltage checks with the units off and compared them with a good monitor in the off position and they look good. Have ordered a service manual but would like to know if this is a common problem with this model. If so, what component should I look at ?
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.
Posted on Nov 01, 2009
Hello: I'm having the same problem, Your voltages can't be good . the issue is on the standby power supply, that is the TYN256 IC, but that IC is not the problem, something else cause the voltages go all wrong, where it's suppose to have 24V i read 12V, on the 9V, reads 6.8V , the 5V reads 3.8 , the 3.3 seems to be good, the problem is you need 9V to energize the relays, I've checked for shorts and nothing, all components look good, this IS a common problem, and I'm pretty sure it's cheap to repair , just nobody seems to have the right clue that what's the faulty component.
Posted on Dec 19, 2007
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