Car stereo output stage blown
- From: JR North <junkjasonrnorth@xxxxxxxxxxx>
- Date: Fri, 25 Apr 2008 15:32:05 -0700
Pyle PLRG23
I had the unit out, on the bench, troubleshooting no FM lock. AM was fine. I had power/ground connected to the plug, which also carries the speaker circuits. These are female connectors.The radio was on, at min volume. I did not have speakers connected. During initial testing with a logic probe in the tuner section, the radio shut off. I found high current draw in the power supply, and turned it off immediately. On checking, the radio would not power up, and drew 10A from the supply. I determined the monolithic stereo output chip (TDA-burn) was dead short to ground. The heatsink was quite hot.
Q:
Could the chip fry from no load connected? I'm certain I didn't short it at the plug, and wasn't even in the output stage with my tests.
JR
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