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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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SDP502 or SD-P502 Pioneer 52" Clean shuts down after 1 minute or less.
Acted like x-ray trip picture cuts out & power LED goes out.
Have schematic for it from pioneer, resoldered deflection board to no avail, checked & changed caps. Googled for that model and problem doesn't match what I'm having. What I found was only for leaky transistors in convergence board, this one convergence board is working fine. Voltages are on specs, picture normal (remarkable for 10+ year old projector), audio working. Seen this before? I was just going to write it off unfixable and push it back to poor customer. :-( Cheers, Wizard |
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SDP502 or SD-P502 Pioneer 52" Clean shuts down after 1 minute or less.
You got more gutsn than me . I will never touch another pioneer anything ,
with all their high $$ custom chips and poor design :-( "Jason D." wrote in message ... Acted like x-ray trip picture cuts out & power LED goes out. Have schematic for it from pioneer, resoldered deflection board to no avail, checked & changed caps. Googled for that model and problem doesn't match what I'm having. What I found was only for leaky transistors in convergence board, this one convergence board is working fine. Voltages are on specs, picture normal (remarkable for 10+ year old projector), audio working. Seen this before? I was just going to write it off unfixable and push it back to poor customer. :-( Cheers, Wizard |
#3
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SDP502 or SD-P502 Pioneer 52" Clean shuts down after 1 minute or less.
"Jason D." wrote in message ... Acted like x-ray trip picture cuts out & power LED goes out. Have schematic for it from pioneer, resoldered deflection board to no avail, checked & changed caps. Googled for that model and problem doesn't match what I'm having. What I found was only for leaky transistors in convergence board, this one convergence board is working fine. Voltages are on specs, picture normal (remarkable for 10+ year old projector), audio working. Seen this before? I was just going to write it off unfixable and push it back to poor customer. :-( Cheers, Wizard |
#4
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SDP502 or SD-P502 Pioneer 52" Clean shuts down after 1 minute or less.
Jason,
Check the feedback circuit from the high voltage bleeder. It feeds an op amp that controls the high voltage B+ Also check the x-ray protect feedback for the 6.xx volts Do all this with a black raster input signal. Check the collector of the pnp regulator transistor that is mounted on the same heat sink as the HVout. It shouldn't be over 120 volts with dark screen. Good Luck, Bill Jr BTW, the high voltage bleeder is NLA from anywhere. "Jason D." wrote in message ... Acted like x-ray trip picture cuts out & power LED goes out. Have schematic for it from pioneer, resoldered deflection board to no avail, checked & changed caps. Googled for that model and problem doesn't match what I'm having. What I found was only for leaky transistors in convergence board, this one convergence board is working fine. Voltages are on specs, picture normal (remarkable for 10+ year old projector), audio working. Seen this before? I was just going to write it off unfixable and push it back to poor customer. :-( Cheers, Wizard |
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