Question about Philips 42PF7320A 42 in. Plasma HDTV
We purchased our TV in 2003, it's a Phillips 42" plasma (model # 42FD9954) and the unit will not turn "ON". We see a standby red light indicating the monitor's "ON" but the when the power button is pressed on the remote control, the red light only blinks "on" and "of" for each time the power button is pressed on the remote. We have tried unplugging the unit but only for a few minutes. Anyone have a fix? We called around for TV repair prices and these places want $125 just to give us a diagnostic analysis and then another $360 flat service fee (no parts included) to come back for the repair. We really appreicate any help from anyone!
I have a Phillips 42FD9954/17S and every time I try to turn it on I also get the power red light blinking and sometimes it will try to turn on with a bunch of clicking noises and it will be green for a while then turn red. What I do and its very weird but works, put a blow dryer on hot and blow it under the tv on the side of the power button for about 10 minutes and it will turn on. I took it apart and there is a heat sink that if i put the blow dryer directly onto it on heat it turns on in less than a minute. Can someone tell me how I can fix this heat sink? I cant take it off. I want to put some thermal compound to see if that works. Give it a try I promise it will work. The Red Light has to be on put the heat on it and then press the power button, if you hear it clicking and green then back to red you are almost there. Keep putting heat on it and it will turn on.
Posted on Mar 31, 2009
Your problems may have been just caused by loose solder on the high power/voltage handling components of your tv. Components such as power transistors, voltage regulator ICs, rectifiers, etc., generate heat during normal operation that is why some of these components sometimes have heatsinks on them.
If heat sink is not present or heatsink is not efficient enough to dissipate heat, it melts the solder and makes the component pins lose contact and worse burn out the affected component.
1. Look for loose/blackened or sometimes like rough overheated solder joints on the power supply PCB or power amplifier section of your tv circuit.
2. If there is, take out the burnt solder with a soldapult or a plain old toothbrush by heating it with soldering iron and brushing it while the solder is hot.
3. Look for burnt/overheated components (obvious physical signs) such as power transistors, diodes, capacitors, resistors, etc. I there is, there is nothing much you can do unless you could identify the component part no. or value and able to purchase the replacement.
4. If you found a defective component, it may not be the only one that was defective. It may have been just a part of the circuit that was affected or just was the main cause of the failure. Try looking for more obvious signs on the circuit board.
5. Transistors, diodes, SCRs, TRIACs, DIACs, and other semiconductor tend to become shorted if the become defective. If this is the case, some manufacturers provide circuit protection to prevent further damage to the equipment. Check for possible semiconductor shorting (you should have familiarity with semiconductor charateristics and testing) . Isolate the suspected component and test with a good old VOM. A presence of shorted component also would indicate an opened or burnt resistor/s or sometimes micro fuses on the circuit board. Use your VOM to test for resistance. An open resistor would give infinity or very high resistance reading.
Hint: Resistor values to look at are 0.1 ohm-2.2 Ohms. Philips commonly uses these resistors as safety circuit fuses.
6. If component is un-identifiable or not available, it is wiser to bring the tv to your nearest or trusted electronics technicians in your area. They are more experienced to handle the problem and they may have the parts available in stock or get them for you.
Note however that it is not always guaranteed that the component you found and replaced will immediately solve the problem there may be some other parts that were affected by the defective components and will give different symptom or just burnout the new components again.
Consider it you're lucky if you replaced components or re-soldered loose joints and your TV worked !
if this solution is too much for you to follow or beyond your comprehension, then dont waste time, just bring your tv to an experienced technician to do it for you.
If all else fails, buy a ne TV!
Good Luck !
Posted on May 23, 2008
The blinking red light problem can, in most cases, be fixed by changing three capacitors oin the power supply. Check for physical signs of damage. The capacitors are usually located at the top left hand side of the board.
Posted on May 03, 2008
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