I have an older Pioneer VSX-502 receiver that got hit by lightning through the
AC line. Everything seems to work, except for the radio tuner. All fuses are
ok. I have already replaced the LM7001 chip, and the TC9164N (Pioneer suggests
these to be the problem after a strike through the antenna). Still, no radio.

I can get a "thumping" sound (oscillation) through the speakers when in AM
mode, but nothing in FM. Also, there are two indicators in the dislplay for
"tuned" and "stereo". Neither one is lit, except for when the board that
contains the LM7001 chip is removed(?), then they both work, but obvivously no
radio without the antenna card.

One other problem is that when the volume is increased past 1/3 of the way,
there is a relay click (overload protect?), and the speakers cut out. Any
suggestions welcome.

TIA,
Del

The entire tuner board should be available; Pioneer is pretty good about
that. The price is probably even pretty reasonable. (35.00 or so)

The speakers cutting out is more likely unrelated. I would say fix your
speaker wires. This is a common fault. You can test by either shutting off
the speaker switch, or disconnecting the wires from the back of the
receiver, NOT at the speakers. If the receiver stops shutting down as volume
is increased, the receiver is probably OK. You could even have a shorted
speaker driver.

Mark Z.



"DFerree923" wrote in message
...
I have an older Pioneer VSX-502 receiver that got hit by lightning through
the
AC line. Everything seems to work, except for the radio tuner. All fuses
are
ok. I have already replaced the LM7001 chip, and the TC9164N (Pioneer
suggests
these to be the problem after a strike through the antenna). Still, no
radio.

I can get a "thumping" sound (oscillation) through the speakers when in AM
mode, but nothing in FM. Also, there are two indicators in the dislplay
for
"tuned" and "stereo". Neither one is lit, except for when the board that
contains the LM7001 chip is removed(?), then they both work, but
obvivously no
radio without the antenna card.

One other problem is that when the volume is increased past 1/3 of the
way,
there is a relay click (overload protect?), and the speakers cut out. Any
suggestions welcome.

TIA,
Del

Sounds like you have the same problem that I have with mine, no radio. Did you ever get it fixed?
dannyg12