I checked for DC voltage at the output of the power amp IC, and got about
3v. Maybe the IC is cooked? I also tried grounding the IC directly to the
PS, which made no difference. Ditto for resoldering the connections to the
board from the IC.

Also, when the unit is doing the flashing thing, my voltage drops from 14.4
to about 8. With an ammeter connected, it's only drawing about 300mA so I'm
not sure what that is all about. I could go ahead and replace the IC, but
I'm not real familiar with car stereos, and there is a lot of logic and SM
components in there that I suppose could also be causing the problem. Add to
this the fact that I have no schematic, and you can see that I'm running out
of ideas. I suppose I could scope the output, but I can already hear what
I'm going to see (maybe I'll give it a try anyway).

Any other ideas?

Thanks


wrote in message
...
On Wed, 17 Sep 2003 21:54:14 -0400, "tempus fugit"
wrote:

Hey all;

I'm currently trying to get a Sony EXCD-21 auto CD player up and running.
The unit worked fine when it was removed from the previous car, but when
I
tried to install it in another car, it was dead.

I pulled it back out, and hooked it up to my bench PS, and found that it
wasn't actually dead, but the display was flashing faintly (all the LEDs
for
the panel as well as the LCD display). If I hit the reset button, it
turns
off, but flashes again when I turn it back on. I noticed that when a
ground
wire for the speaker touched the power ground, I got a steady display and
all the controls were now functioning; however, I get no sound out of
it.
With the ground wire separated, I get a dit-dit-dit sound from the
speaker.

Any ideas on what to do next?

Does grounding the case fix the problem?