SDP502 or SD-P502 Pioneer 52" Clean shuts down after 1 minu

J

Jason D.

Guest
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
 
You got more gutsn than me . I will never touch another pioneer anything ,
with all their high $$ custom chips and poor design :-(

"Jason D." <jpero@sympatico.ca> wrote in message
news:40245789.14251554@news1.on.sympatico.ca...
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
Click to expand...
 
"Jason D." <jpero@sympatico.ca> wrote in message
news:40245789.14251554@news1.on.sympatico.ca...
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
Click to expand...
 
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." <jpero@sympatico.ca> wrote in message
news:40245789.14251554@news1.on.sympatico.ca...
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
Click to expand...
 
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