Mistubishi Diva Horizintal Strip Picture on Tube

Hi, I have a Mitubishi Diva 35inch CRT TV (purchased 1995-1996??)which seems to have a tube problem which seems to be intermitent. The picture seems to minimize of a inch wide strip across the centre of the screen (goes from edge to edge)...is this a tube problem?? It seems that sometimes turning the tv off for a while and turning it on seems to clear the problem....but is seems to be happening more regularly now... Can anyone help me fix this or understand the problem?? Cheers Anton

Havin-a-go Nov 27, 2007

Same problem where the picture height reduces to 1" after 30 minutes with a CT-33AC2SL Diva. Have not been able to get a datasheet on what I suspect is the main IC driving the video. Can't spot any cold solder joints with a magi-lamp, can't spot any leaking electrolytic capacitors. There are too many capacitors to change and hope you get the right one. The IC I'm trying to source the datasheet is a Toshiba TA8719AN but Toshiba say its obselete and haven't got a copy. If a copy is available hopefully this will lead to the right capacitor to be replaced

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Nope, the good news is that it is NOT a Tube problem! From your description, it looks more like a Cold solder in the Vertical Output stages (80% probability. Another possibility is dried out Electrolytic Capacitors in the same stages, or in the Power supply Line to the Vertical Output Stage. Nothing you can do, unless you know solid state electronics. Better get a good Technecian to have a look. he will locate the Cold solder quickly enough, and do a resolder.

Posted on May 12, 2007

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