Question about Philips 50PF7320A 50 in. Plasma HDTV
Have replaced capacitors and worked originally but then started going black screen and now clicks on and then off. Green lights come on on power board when back open and then click off
If you used capacitors from Radio Shack, that may be why. RS uses whatever they can get in the values spec'd, so they really are only adequate for general purpose use.
When I do a repair on a power supply, I order "High Ripple Current" types, or even the newer style polymer types, and step up in the working voltage slightly. So a 16 volt cap gets a 25 colt cap, a 25 volt cap gets a 35 volt cap and sometimes a 35 volt cap will get a 50 volt cap.
Now- if you did order high ripple types, check the transistors in the inverter section. They can fail too. If they check okay, then look at the inverter transformers. They do make a test tool for them, and not too expensive for what it does, but you can also check the transformers with a "Grid Dip Meter". They must be out of the circuit or you may get some false faults.
Sometimes you can find a faulty transformer by locking the PWM controller on- the method is usually described in the data sheets for that particular controller IC from the manufacturers data sheets, and if a transformer is bad, it may reveal itself with a whine, or by flaming out. Digikey dot com does have a wide selection of the PWM controller IC's, and you can get the datasheet online from them if they carry that IC. Otherwise you need to rely upon the manufacturer's website or a site like Datasheet archive.
If the set has more than 3000 hours of use- consider replacing the CCFL tubes.
Posted on Nov 01, 2012
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Posted on Jan 02, 2017
hello, amigo if the all the caps are godd then you have to replace the power supply board. don't try to fix it this is not an easy task. you are looking at almost $200.00 with tax an shipping. just go to google and type your tv model # and ask for the power supply board or just look for the part# on the board itself. good luck
Posted on Jul 29, 2009
Commonly it's going to be a power supply related problem. The two boards that need to be looked at is the Main Power Supply Board or the power supply board for the screen. The one that powers the screen, some manufactures call it a Backlight Inverter Board.
If you have some electronic experience, you can sometimes find a Service Manual for the TV over the internet for less than $20. It will have the all resource material for repairing your TV model. It's just the matter of replacing the bad part on the circuit board.
Posted on Aug 12, 2009
The power board numbers you need to search for on eBay is 310432847531 or 310432838621 - they are compatible according to Philips.
Posted on Nov 05, 2009
I had the same problem and it was the power supply board,but I replaced it myself and only spent about $140.00 for the part and 2 day shipping . It was easy just pull the back cover off and there are about 8 small screws that hold it on and like 6 connectors that's it. Also ShopJimmy.com was the place for parts on these T.V.'s.
Posted on Nov 09, 2009
One of the boards (module) has a short on it, and or the power supply itself is failing.
The service center will find the fault using the process if elimination. They will replace the bad boards or modules as required to get the set working again.
Posted on Dec 16, 2009
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