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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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One possible solution for bright blue screen with retrace lines
Hello,
I was troubleshooting a bright blue picture with retrace lines. I opened up the back, and I noticed that if I put a very slight pressure on a vertical board (using a wooden stick,), the problem corrected itself. This board, the Y/C Jungle, is shielded, being inside a metal frame. To get the board out, you have to remove the shield first. I've put the Y/c jungle back in after soldering all internal connections, and the main IC on that board. TV is now working. By the way, what's the purpose of the shield? During my testing I left it out and the picture seemed fine. TV is a 1992 Sony KV-27xbr35. regards, Dave |
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"datest" wrote in message ... Hello, I was troubleshooting a bright blue picture with retrace lines. I opened up the back, and I noticed that if I put a very slight pressure on a vertical board (using a wooden stick,), the problem corrected itself. This board, the Y/C Jungle, is shielded, being inside a metal frame. To get the board out, you have to remove the shield first. I've put the Y/c jungle back in after soldering all internal connections, and the main IC on that board. TV is now working. By the way, what's the purpose of the shield? During my testing I left it out and the picture seemed fine. TV is a 1992 Sony KV-27xbr35. regards, Dave The shield may be there to prevent the TV from interfering with other equipment, it's also possible that in some situations it would make a difference in performance. |
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On Mon, 17 Jan 2005 20:43:42 GMT, "James Sweet"
wrote: By the way, what's the purpose of the shield? During my testing I left it out and the picture seemed fine. TV is a 1992 Sony KV-27xbr35. regards, Dave The shield may be there to prevent the TV from interfering with other equipment, it's also possible that in some situations it would make a difference in performance. Thanks for the info. Looks like my fix is not successful, and I'll have an opportunity to put it back now that I've got to get the chassis out again. I suspect either a bad solder joint or a crack somewhere because when I flex the board ever so slightly the picture is restored. However, this board has solder, components and traces on both sides, with tiny miniature parts that I'm going blind looking at. Unless the fault is on the main A board, very close to where this y/c jungle is soldered in. Any thoughts? Dave |
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