Riddled TV Repair Forum

zach · Joined: 13 Nov 2010 Posts: 3 Location: New York

Hi,

I'm hoping someone can help me pinpoint a problem I'm experiencing on two Sony PVM-5041Q tvs. These are the 5" color monitors from Sony's professional broadcast line.

The symptom is instead of the picture it displays thick rolling white or pink horizontal bars, slightly tilted diagonally, then turns off after about 10 seconds.

I have swapped out the boards and determined that the problem lies either on the board with the flyback transformer, the board with the socket for the electron gun, or on the tube itself. I cannot swap out these boards, since the anode clip is glued on so securely I would be worried about damaging the envelope by trying to remove it (seems that they used a latex based adhesive that has chemically bonded with the suction cup).

Any insight as to where the problem might lie would be greatly appreciated. There is no visual damage to any of the components.

Thanks!

Zach

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kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

so the lines go away after 10 sec? or the video shuts off entirely?

zach · Joined: 13 Nov 2010 Posts: 3 Location: New York

Video turns off entirely.

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

If it were in my shop, I would first test the flyback. Then test the CRT.

zach · Joined: 13 Nov 2010 Posts: 3 Location: New York

I would think it's most likely something on the board. As some background, I reinstall crt television in custom cabinets. I believe these problems developed due to having to transport them before the boards were secured or forget to connect a jumper before powering up. I kind of doubt it's the tube or flyback because I think of those as some of the less fragile components. The first thing I checked was the fuse, but there's no visible sign it's blown. I also wouldn't want to cut the wire on the flyback and, since I can't remove the anode clip, this only leaves testing it from the pins on the bottom- a little more annoying and less reliable.

Thanks,
Zach

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