Panasonic TH-42PX75U - Can See Menus But No Picture

[TransAm84]

Hi everyone, I am fairly new to this hobby but thanks to this forum i was able to repair my computer monitor!

I picked up a 2007 Panasonic TH-42PX75U for next to nothing, knowing it had an issue. The TV turns on ok with the remote and button on tv. All menus seem to work as well as volume & channel/input display. There is no picture or sound from any input. I have checked and re-seated all cables. Can i assume the A board is faulty?

Any help is greatly appreciated.

[capkid]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

I'd assume that the A board is faulty. I like to hook up a portable DVD player to test. It sounds like you've checked out the inputs.

[TransAm84]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

Also there is no sound. Occasionally when cycling through the inputs I will see this green or white horizontal or vertical lines. Also, at one point, with a DVD player plugged in, I got this big white block with a thin green line above it (As seen in the pic). Thanks again

[TransAm84]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

Assuming its a faulty A board, is there a way to repair it? Finding one online is proving to be difficult. Also, I am unsure of the function of the A Board and the D Board, can anyone explain them to me in layman terms? Thanks again

[capkid]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

eBay: http://www.ebay.com/itm/Panasonic-TH...item1c351bb971

Verify the part number. I'm not a fan of buying main boards on eBay, because there are quite a few faulty ones out there being sold as working. You may have to vary your search to find one online.

If you can have the main board professionally repaired, that would be even better. I've never tried repairing a Panasonic main board myself. This company MAY be able to repair it - you'd have to check with them to see if this is one they actually repair. They repaired a Samsung main board for me: http://www.moduslinkptstvboards.com/...andreturn.aspx

http://www.moduslinkptstvboards.com/...BS-P13519.aspx

Here's what I've learned about the A board and D board:

The A board, or main board, is essentially the brains of the TV. It controls functions such as video and audio processing, remote control signal processing, on/off power off signals, etc. The D board, or logic control board, is sort of a coordinator between the various boards in the TV. For example, it takes signals from the main board and converts them so they can be displayed by the various "picture" boards. It normally controls a lot of the display timing so that pixels fire appropriately.

[kevinm34232]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

eBay: http://www.ebay.com/itm/Panasonic-TH...item1c351bb971

Verify the part number. I'm not a fan of buying main boards on eBay, because there are quite a few faulty ones out there being sold as working. You may have to vary your search to find one online.

If you can have the main board professionally repaired, that would be even better. I've never tried repairing a Panasonic main board myself. This company MAY be able to repair it - you'd have to check with them to see if this is one they actually repair. They repaired a Samsung main board for me: http://www.moduslinkptstvboards.com/...andreturn.aspx

http://www.moduslinkptstvboards.com/...BS-P13519.aspx

Here's what I've learned about the A board and D board:

The A board, or main board, is essentially the brains of the TV. It controls functions such as video and audio processing, remote control signal processing, on/off power off signals, etc. The D board, or logic control board, is sort of a coordinator between the various boards in the TV. For example, it takes signals from the main board and converts them so they can be displayed by the various "picture" boards. It normally controls a lot of the display timing so that pixels fire appropriately.

What was wrong with the Samsung main board that they repaired? I've got a 40" and 46" sitting here with suspected main board issues, and they are $100+ if you can find them.

[capkid]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

What was wrong with the Samsung main board that they repaired? I've got a 40" and 46" sitting here with suspected main me issues, and they are $100+ if you can find them.

The Samsung would run for a while, sometimes for hours or days, then it would emit a horrible squealing noise. IIRC, the picture also would scramble. ModusLink charged me $70 for the repair. Their prices vary, though. I ran the TV for a week without issues before I sold it.

[kevinm34232]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

Did they say what they repaired on it? How long did it take? Wonder how they diagnose and test them..

[capkid]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

Did they say what they repaired on it? How long did it take? Wonder how they diagnose and test them..

I didn't ask, and I doubt they would have given me an answer. I think the total turnaround, including shipping back to me was about a week.

[azus26]

Hi everyone, I am fairly new to this hobby but thanks to this forum i was able to repair my computer monitor!

I picked up a 2007 Panasonic TH-42PX75U for next to nothing, knowing it had an issue. The TV turns on ok with the remote and button on tv. All menus seem to work as well as volume & channel/input display. There is no picture or sound from any input. I have checked and re-seated all cables. Can i assume the A board is faulty?

Any help is greatly appreciated.

i have the same problems do you find the issue ?

[diif]

Re: Panasonic TH-42PX75U - Can See Menus But No Picture

i have the same problems do you find the issue ?

I would suspect the Analog Devices IC.
https://www.youtube.com/watch?v=qIKTbYYS6is
https://www.youtube.com/watch?v=QZlc6tiL1gk