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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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Sony Model KV-32XBR48 slow turn on and flashing video for short period at turn on
Have a Sony Model KV-32XBR48 32" TV with the following problem.
First, it takes a rather long time for the video to come on. On most Sonys that I have encountered, the stereo indicator light will flash for about 8 times before the video comes on. On this unit, it takes about 20 flashes before the video comes on. When the video does finally turn on, it will intermittently go off (as if the video is being muted) and on (off for a few seconds, on for longer than a few seconds). It will cycle through this process for about a minute or two before the video will finally stay on. I have resoldered areas (horizontal drive, vertical, power supply) with no change in symptom. Any help would be greatly appreciated. Thanks Ron. -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Sony Model KV-32XBR48 slow turn on and flashing video for short period at turn on
There are many reasons for this type of fault. Some of the most common are
problems in the main power supply, one of the scan circuits are not properly starting up, and or the high voltage or screen bias to the tube may not be coming up properly. Any one or combination of these faults can trigger the protection circuits to not allow HV to come up. One cause that we see from time to time is that the picture tube (CRT) is starting to go weak. When it is weak, the HV current is too low, and the protection circuits will hold off the HV until the CRT is working correctly. As the tube ages, it will take longer for it to warm up. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ========================================= "Ron Novini" wrote in message news:d6ae6f831fe4b3f5198e2e720a4ffb29.123933@mygat e.mailgate.org... Have a Sony Model KV-32XBR48 32" TV with the following problem. First, it takes a rather long time for the video to come on. On most Sonys that I have encountered, the stereo indicator light will flash for about 8 times before the video comes on. On this unit, it takes about 20 flashes before the video comes on. When the video does finally turn on, it will intermittently go off (as if the video is being muted) and on (off for a few seconds, on for longer than a few seconds). It will cycle through this process for about a minute or two before the video will finally stay on. I have resoldered areas (horizontal drive, vertical, power supply) with no change in symptom. Any help would be greatly appreciated. Thanks Ron. -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Sony Model KV-32XBR48 slow turn on and flashing video for short period at turn on
Feel free to do a gGoogle groups search for Sony AKB, video flashing etc.
Assuming no other problems with the set, more than likely the picture tube is simply too weak and the AKB is having a hard time compensating for the poor tube. If when the video is flashing and you put on a black and white movie, is it really black and white or is it shifted to some off color? If it is shifted a very good chance the tube is simply worn out. Strongly suggest you find someone with lots of experience on the Sony line of tv sets to do a proper internal diagnosis to confirm the actual cause of the failure. David Ron Novini wrote in message news:d6ae6f831fe4b3f5198e2e720a4ffb29.123933@mygat e.mailgate.org... Have a Sony Model KV-32XBR48 32" TV with the following problem. First, it takes a rather long time for the video to come on. On most Sonys that I have encountered, the stereo indicator light will flash for about 8 times before the video comes on. On this unit, it takes about 20 flashes before the video comes on. When the video does finally turn on, it will intermittently go off (as if the video is being muted) and on (off for a few seconds, on for longer than a few seconds). It will cycle through this process for about a minute or two before the video will finally stay on. I have resoldered areas (horizontal drive, vertical, power supply) with no change in symptom. Any help would be greatly appreciated. Thanks Ron. -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Sony Model KV-32XBR48 slow turn on and flashing video for short period at turn on
"Ron Novini" wrote in message
news:d6ae6f831fe4b3f5198e2e720a4ffb29.123933@mygat e.mailgate.org Have a Sony Model KV-32XBR48 32" TV with the following problem. First, it takes a rather long time for the video to come on. On most Sonys that I have encountered, the stereo indicator light will flash for about 8 times before the video comes on. On this unit, it takes about 20 flashes before the video comes on. When the video does finally turn on, it will intermittently go off (as if the video is being muted) and on (off for a few seconds, on for longer than a few seconds). It will cycle through this process for about a minute or two before the video will finally stay on. I have resoldered areas (horizontal drive, vertical, power supply) with no change in symptom. Any help would be greatly appreciated. Thanks Ron. Update: Audio lost after several hours operation. Am I having trouble with jungle IC? Is that IC351 on main board? Thanks Ron -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Sony Model KV-32XBR48 slow turn on and flashing video for short period at turn on
Subject: Sony Model KV-32XBR48 slow turn on and flashing video for short
period at turn on From: "Ron Novini" Date: 9/19/03 8:41 AM Eastern Daylight Update: Audio lost after several hours operation. Am I having trouble with jungle IC? Is that IC351 on main board? Thanks Ron Probably unrelated. If this uses the MTS smd assy, it's likely going bad. Picture problem is as David describes it. John Del Wolcott, CT "Nothing is so opportune for tyrants as a people tired of its liberty." Alan Keyes (remove S for email reply) |
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