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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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All white raster on Sony Wega TV
Sparky" wrote in message ... This TV was working before we recently moved it -- without dropping the 175 lb beastie! Now with no inputs the raster is all white instead of all black as it used to be. The brightness and picture controls (as well as all of the other menu items) appear to operate and display normally but the background raster remains a saturated white instead of black as it used to. Unlike the main picture, the PIP picture has reasonable contrast but it has no color, only black and white. You can see a just a tiny bit of detail in the main picture. Since the PIP picture displays video and I have a raster, I'm looking for problems in the luminance path for the main picture, not the CRT grids or anything else CRT related. Looking at the schematic makes me suspect that the PIP control is shot but all else is likely okay. Any opinions on what may be wrong with the TV and where I might be able to source a replacement circuit board? Thanx! Since you say it was dropped, I'd look for cracks in the cirucit board and also look for cracked solder joints. - Mike |
#2
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All white raster on Sony Wega TV
Michael Kennedy wrote:
Sparky" wrote in message ... This TV was working before we recently moved it -- without dropping the 175 lb beastie! Now with no inputs the raster is all white instead of all black as it used to be. The brightness and picture controls (as well as all of the other menu items) appear to operate and display normally but the background raster remains a saturated white instead of black as it used to. Unlike the main picture, the PIP picture has reasonable contrast but it has no color, only black and white. You can see a just a tiny bit of detail in the main picture. Since the PIP picture displays video and I have a raster, I'm looking for problems in the luminance path for the main picture, not the CRT grids or anything else CRT related. Looking at the schematic makes me suspect that the PIP control is shot but all else is likely okay. Any opinions on what may be wrong with the TV and where I might be able to source a replacement circuit board? Thanx! Since you say it was dropped, I'd look for cracks in the cirucit board and also look for cracked solder joints. - Mike The mystery is that the TV malfunctions now but was NOT dropped during the move. Pulling the back of and tapping everything inside didn't expose any connections that are sensitive to mechanical vibration. More troubleshooting to follow as I get the time... |
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