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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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#1
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Sony KV-27FS16 (Chassis BA5)
Hello Group,
After 8 1/2 years my Sony Wega went dead yesterday. I opened it and all I could find was the 6.3A main fuse open, not burned, just open. I checked some of the major semis then replaced the fuse and powered it on. The TV seems flawless. My question: Is it advisable to ESR and/or replace all the power supply caps, resolder the horizontal drive and any other suspect points to give the set a longer life? The CRT is still in excellent shape - starts up in about 5 seconds. I figure if I replace all the old caps now and resolder the most common problematic spots, it could prevent some lengthy troubleshooting and replacement of expensive semis and give the TV another 5 years of life. Although it is an analog TV it is connected to a cable box with analog video outputs so the older technology doesn't bother me for now if it saves me some cash for the next few years. What do other group members think? Thank you in advance for your opinions. -Mike in NJ (TV tech in several shops in Brooklyn and Staten Island until they could no longer stay afloat) |
#2
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Sony KV-27FS16 (Chassis BA5)
"Mike S" nospam wrote in message ... Hello Group, After 8 1/2 years my Sony Wega went dead yesterday. I opened it and all I could find was the 6.3A main fuse open, not burned, just open. I checked some of the major semis then replaced the fuse and powered it on. The TV seems flawless. My question: Is it advisable to ESR and/or replace all the power supply caps, resolder the horizontal drive and any other suspect points to give the set a longer life? The CRT is still in excellent shape - starts up in about 5 seconds. I figure if I replace all the old caps now and resolder the most common problematic spots, it could prevent some lengthy troubleshooting and replacement of expensive semis and give the TV another 5 years of life. Although it is an analog TV it is connected to a cable box with analog video outputs so the older technology doesn't bother me for now if it saves me some cash for the next few years. What do other group members think? Thank you in advance for your opinions. -Mike in NJ (TV tech in several shops in Brooklyn and Staten Island until they could no longer stay afloat) Sony's usually don't have too many cap problems, so my advice would be just replace the fuse, inspect, resolder the horizontal drive transformer and vertical output IC, and be done with it. Replacing numerous caps could invite other problems not foreseen. Just as an example, one of the new caps you use could be inferior in ESR characteristics and make another part run too hot. Mark Z. |
#3
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Sony KV-27FS16 (Chassis BA5)
"Mark D. Zacharias" wrote in message ... "Mike S" nospam wrote in message ... Hello Group, After 8 1/2 years my Sony Wega went dead yesterday. I opened it and all I could find was the 6.3A main fuse open, not burned, just open. I checked some of the major semis then replaced the fuse and powered it on. The TV seems flawless. My question: Is it advisable to ESR and/or replace all the power supply caps, resolder the horizontal drive and any other suspect points to give the set a longer life? The CRT is still in excellent shape - starts up in about 5 seconds. I figure if I replace all the old caps now and resolder the most common problematic spots, it could prevent some lengthy troubleshooting and replacement of expensive semis and give the TV another 5 years of life. Although it is an analog TV it is connected to a cable box with analog video outputs so the older technology doesn't bother me for now if it saves me some cash for the next few years. What do other group members think? Thank you in advance for your opinions. -Mike in NJ (TV tech in several shops in Brooklyn and Staten Island until they could no longer stay afloat) Sony's usually don't have too many cap problems, so my advice would be just replace the fuse, inspect, resolder the horizontal drive transformer and vertical output IC, and be done with it. Replacing numerous caps could invite other problems not foreseen. Just as an example, one of the new caps you use could be inferior in ESR characteristics and make another part run too hot. Mark Z. Thank you, Mark, for your input. That sounds like a plan. Mike |
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