Question about Philips 37PF7320A 37 in. HD-Ready LCD Television

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42pf7321d/37 red led blinks 4 times.no picture or sound unplug and turn back on same thing tou can hear relay click off

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  • kyleroxtx Nov 07, 2008

    i have same problem

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Relay clicking is a power board failure --- part of the board still works to supply power to the flashing lights--- the lights are related to an error code while in protection mode

Posted on Feb 24, 2009

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Red led blinks 4 times.no picture or sound unplug and turn back on same thing tou can hear relay click off


Hi my name is Eric,
I hope I can help you with your issue ,
here is what it sounds like it might be:
It could be just a few bad capacitors on the power supply, if you want to attempt the repair yourself you can do a visual of the power board caps will appear swollen on top.
The ones you are looking for are located almost center bottom of the power board,Usually I can see them clearly with the back on simply shining a light into the back through the holes.
look at the photo I am uploading to see what a bulging cap looks like
With the back removed you will see a few circuit boards the upper one (ac cord runs to it through a small board) is the power supply, it has alot of capacitors on it (cylindrical standing straight up soldered in and marked on the sides with the positive/negative sides and MF and Volts values)
Philips uses 2200Mfd or 3300mfd at 35Volts rating capacitors, they cost about $1-$2 each
usually I replace two of them (or all the bulged on top ones) .
The power board and back unscrew with a torx bit and screwdriver size 10 and 15 , if you do not know how to desolder and resolder then do not attempt this as you may damage the TV more than fix it.
We do not recommend do it yourself, but depending on your knowledge and technical ability you may be able to.
You can replace the whole power supply, but Philips has a few versions in their sets and some so called replacements won't fit due to cable location (sockets) being in a different spot.
If there is a blinking red light on the TV count the blinks,if it still blinks after replacing the swollen cap this would indicate a bad buffer board ,
check the capacitors by looking for the swollen tops I hope thats all it is (usually is), if there are no bad caps post again so I can tell you buffer troubleshooting steps and locations.
here is Philips Phone # 1-888-744-5477 in case you need it for exact part #s
 
 
If you feel good about my solution please click accept.
If you have more questions post them
I will reply asap
Thanks
Eric

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1 Answer

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While I can't tell you what this particular code means I know from experience that power boards fail frequently commonly on those TVs. Do you hear a clicking of the power supply first on and then off after a few seconds?

There's a guy or a company on eBay that offers trade-in for faulty power supplys, you should check them out:
http://stores.shop.ebay.com/TechFetch

Search for 37'' Philips in the title or contact them to ask about it. Used to be $99 flat including return shipping.

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you can disconnect the Y-Sus board(to the left of the psu) and if the led stops flashing you can almost guarantee the Y-Sus pcb is faulty!

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