Re: Magnavox 42mf531d/37 trouble.

I've replaced the defective 4004Q648 139<GP> transformer with the ebay 4004L530008(GP) transformer. The tv still goes to black after a second, however the faint flicker before it turns black is gone.

My soldering gun may have been overkill for this job. Consequently, during the removal process, the small pad under pin 7 was liberated from the board. I did retrive it from molten solder, but was unable to attach it back to the board. Then I lost the little thing as I proceeded downhill at an increasing rate. I could see no visible...

Re: Magnavox 42mf531d/37 trouble.

I've ordered the first one as it will be here several weeks sooner. I'll post the results when I have news to report.
Thanks for the input
Sean9275

Re: Magnavox 42mf531d/37 trouble.

Starting from the bottom of each board:
RH LFT
1) 4.16 11) 4.14
2) 4.12 12) 4.16
3) 4.11 13) 4.13
4) 4.11 14) 4.12
5) 4.12 15) 4.13
6) 4.08 16) 4.12
7) 4.11 17) 4.13
8) 4.09 18) 4.12
9) 4.11 19) 4.15
10) OL 20) 4.10

The part number on #10 reads 4004Q648 139<GP>.
The picture is of #1 for reference....

Re: Magnavox 42mf531d/37 trouble.

The back of the tv is not lit up. Here is a photo of each of the inverters....

Re: Magnavox 42mf531d/37 trouble.

I just verified sound from a dvd player into av2. No faint image with a bright flashlight aimed at screen. The menu bar pops up on power on and faintly flickers before the whole screen goes dark. No image during any of this sequence. I'm not sure how to check for backlights, nothing around the perimeter of the screen. There is some visible light coming from inside the back cover of the tv. It is green, I assume an LED or two, (I know what happens when I assume.)

Where to go from here?
Thanks,
Sean

I have acquired a Magnavox 42mf531d 37 that has no picture. Upon turning the tv on, after a brief moment, the screen flashes dark gray/black and then nothing. The LED on the switch illuminates steady green. The audio, (I am told by previous owner,) works normally.

After researching this condition the capacitors became the prime suspects. Upon visual inspection, there appeared to be no obvious defect with any capacitors on the power board or any other board for that matter. Based on a search of this model tv and similar models on this site, I proceeded to test the components on...