Question about Philips 32MF231D Television

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No picture but I do have hiss from speakers. Unit was intermittent with this problem so suspected connection/solder problem. Cannot find anything visually wrong. Friend (owner) claims that sound always worked even when picture dropped out. I have looked at the 2200uf caps but they look good and are 35v so I suspect this was a later revision (BZxxx628xxxxxx). I measure about 24v going from the PSB to the backlight board. Seems like that must be right. But I'm not seeing a picture even from ambient light so I'm not sure that it's just a backlight issue. 2 green leds light up on main board when it's "on". Another solution here suggests that the main board is hosed. I'd like to be a little more sure before ordering a new one.

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  • Chmed Jul 29, 2009

    Ok, so i bought a used lcd drive board which is located under a large piece of sheet metal (under the power supply and main input board. This new piece did not fix the problem so I swapped it back to the board that came in the TV. But at this point I did discover that I could see an image when pointing light into the screen at the right angle. So I bought a used backlight board (to the side of the power supply). This replacement made it light up correctly. But then I noticed that the left half of the screen had a different hue to it than the right. On a blue screen you couldn't tell but on the menu it was obvious. So I swapped the lcd board back to the newer one. And voila, it's working.


    Thanks

  • Chmed Jul 29, 2009

    Ok, so i bought a used lcd drive board which is located under a large piece of sheet metal (under the power supply and main input board. This new piece did not fix the problem so I swapped it back to the board that came in the TV. But at this point I did discover that I could see an image when pointing light into the screen at the right angle. So I bought a used backlight board (to the side of the power supply). This replacement made it light up correctly. But then I noticed that the left half of the screen had a different hue to it than the right. On a blue screen you couldn't tell but on the menu it was obvious. So I swapped the lcd board back to the newer one. And voila, it's working. Thanks.

  • Chmed Aug 31, 2009

    The board that actually drives the lcd panel is underneath some sheet metal. I ordered a used LCD driver board (CPT-320WA01) from a seller on ebay thinking the problem had to be whatever was driving the lcd but this did not fix the problem, initially. After I discovered that it didn't fix it I swapped back to the original logic board in order to send the newer one back. But instead of sending it right away I decided to order the voltage inverter board (CPT-320WA01C) from the same seller. This fixed the no image problem but showed another problem, the left side of the screen had a different hue to it compared to the right side. There was a distinct division up the middle of the screen. So, I swapped the newer logic board back in and low and behold, it works.

  • Chmed Sep 01, 2009

    The board that actually drives the lcd panel is underneath some sheet metal. I ordered a used LCD driver board (CPT-320WA01) from a seller on ebay thinking the problem had to be whatever was driving the lcd but this did not fix the problem, initially. After I discovered that it didn't fix it I swapped back to the original logic board in order to send the newer one back. But instead of sending it right away I decided to order the voltage inverter board (CPT-320WA01C) from the same seller. This fixed the no image problem but showed another problem, the left side of the screen had a different hue to it compared to the right side. There was a distinct division up the middle of the screen. So, I swapped the newer logic board back in and low and behold, it works.

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Posted on Jan 02, 2017

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SOURCE: horizontal and vertical lines

I am having the same problem with my TV. I believe that the Y-Buffer Driver IC's are bad. There are two small boards on the left hand side(looking at the TV from the back) with 6 small heat sinks on each of them. If you look closely at the boards, it ill say Y-BUFFER on them. There are ribbon cables that run from them to the Plasma screen.

In my TV, several sections of the screen do not have lines in them. These driver IC's are not hot, however the sections of the screen that have lines in, the drivers are hot to the touch. In order to verify that the chips are indeed bad, I am going to swap one that I think is bad with a good section and see if the problem moves. If this is the case, the boards can be swapped out, or chips replaced depending on what kind of parts I am able to find. The chip that they use is SN755867. I haven't been able to locate a source for the chips yet.

Posted on Jun 29, 2008

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SOURCE: philips 42pf7321d/37 blinking power board question

The probleis with one of the maina boards and trouble shooting would have to be done to see which board is bad.

Posted on Aug 19, 2008

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SOURCE: 42PF5321D/37

Measure the connector from the logic board to the power supply the second pin from the left it will say Vs_ On if the set has 3.1 volts the problem is the SSB or the logic board. On the logic board there should be a solid led and a flashing led that shown that data id flowing and the problem is the SSB. The SSB is easy to replace just remember what you tokk loose and from where. You probely will save money that way. If the set is in warranty or just out of warranty contact Philips 1-888-744-5477 and see what they can do first.

Posted on Aug 20, 2008

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SOURCE: I have a Philips 30PF9946D/37 no picture

what you have is a bad inverter transformer on the inverter board. I nashed my teeth on this problem for a long time because no diagram is avail. Here's the fix for you:

Remove the invertor board. Take an Ohm meter and measure the outer 4 legs of each transformer. Between pins 1 and 4 (side with the white dot near leg 1) you should read .3 ohms. This side is usually good. Between pins 5 and 8 you should read approx 1.8 to 1.9Kohms. ANYTHING above that is a defective transformer. I'm sorry I do not have the part number for this, I've just been using an old board from a set with a cracked panel. If I can find a part number I will try to post. You can try Encompass parts on the web, they may be able to supply part number and transformer with location number.

Rick
W2ICA

Posted on Mar 19, 2009

  • 1 Answer

SOURCE: magnavox 32mf23id/37 wont tun on

Had the same issue, I replaced two 1200uf caps on the power supply board and now it works fine again. Remember to replace the caps with caps rated for at least 35wvdc.

Posted on Mar 27, 2009

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