Question about Philips Magnavox 42MF521D/37 Television
Tv was working fine, unpluged cable from back with tv left on and then unpluged tv. When I went to turn tv back on it clicks on and back off. It seems to cycle approx. every ten seconds if you hold the putton in to power on and power off. It also tries to power up on any of the keys ( menu, volume, channel keys)
I have unpluged tv and waited and tried to power it up with no luck.
my tv was fine, turned it off, won't turn on at all. unplugging, waiting the time then plugging in again, doesn't make any difference. is there a button or something?
This is a common problem on these plasma TV's. The problemresides in the high voltage boards known as the X and Y Sustainboards.. You can purchase them here for a very reasonable price:
The above link is to a Y-SUS board. The X-Sus board is often the 2nd cause of failure and can be found here:
Totest which board is failing, you need to check voltage input to theYSUS board first... Input should be 120V from Power supply, outputshould be above 250V.. Do this test with XSUS disconnected. IF 250+Vexists, then XSUS is damaged. If not, then the YSUS is the faulty part.
Posted on Oct 16, 2009
You may need to replace the Y-buffer to say the least. And if this is not the problem, you will need to replace theY-main board. If the Y-main board is bad you will also change the Y-buffer. Please see a Philips Tech!!!
Posted on Dec 25, 2009
The tv needs the power supply serviced, most likely ( 2) 3300u 10v capacitors. (they can be spotted because they will bulge on top) best to have a pro replace them, however since I am telling you what the problem is try to negotiate a fair price - no more than $150 dollars. you can try to do it yourself but you will need soldering equipment and some level of electronics knowledge. good luck.
Posted on Sep 14, 2010
SOURCE: I have the Philips 50
There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, it may eventually stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.
If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).
Most of the caps that go are 10V 1000uF or 3300uF.
I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
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(do not delete)
As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.
Posted on Mar 25, 2011
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Same happened with my Olevia 540-B11. You can probably find the details of how to disassemble the TV somewhere online. The problem is poor stress-relief on the cables that plug into the secondary (low voltage) side of the power circuit board (PCB). Once the back is removed you'll find the PCB on the left side with three cables connected to the very top of the board. These cables plug into four clips, 3 horizontal clips side-by-side at the top and one vertical clip on the left side. Unplug these cables, remove the PCB and re-solder the sockets (there are approximately 40 solder points on the back of the board). Reassemble your TV and it'll work just fine.
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