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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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Mits vs45607
Hi;
This puppy came in with lines that got worse as it warmed up and eventually lost all tuning on the main tuner. I put the cap tester down after I saw the coolant. So I cleaned it and now have very different symptoms. There is no tuning at all, no convergence correction and it's dark. All supplies seem to be normal, but I don't have a print. There is however no pin on either tuner with 32 volts. From what I can see this set doesn't use a zener for that supply, there is no higher source coming from the power supply. There is a 32 volt though so I assume that's where it comes from, err is supposed to come from. I suspect with all the handling one of the feedthrus might've popped, may even have been weakened by corrosion. At this point it would help me to know which of the tuner pin(s) get the 32 volts. That would give me a convenient point into which I can backfeed the supply. Does anyone know which pin this is ? Also if you experience on these do you happen to know if the 32 volt source should affect the convergence and video ? Thanks in advance. JURB |
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Jeff,
You are really gonna need the paper manual to track the circuit board traces and find the open feed thru's. PIA if you ask me for a 46" with a coolant leak. BTW check www.3diamonds.com for your other question. Good Luck, Bill Jr "JURB6006" wrote in message ... Hi; This puppy came in with lines that got worse as it warmed up and eventually lost all tuning on the main tuner. I put the cap tester down after I saw the coolant. So I cleaned it and now have very different symptoms. There is no tuning at all, no convergence correction and it's dark. All supplies seem to be normal, but I don't have a print. There is however no pin on either tuner with 32 volts. From what I can see this set doesn't use a zener for that supply, there is no higher source coming from the power supply. There is a 32 volt though so I assume that's where it comes from, err is supposed to come from. I suspect with all the handling one of the feedthrus might've popped, may even have been weakened by corrosion. At this point it would help me to know which of the tuner pin(s) get the 32 volts. That would give me a convenient point into which I can backfeed the supply. Does anyone know which pin this is ? Also if you experience on these do you happen to know if the 32 volt source should affect the convergence and video ? Thanks in advance. JURB |
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