HP 720 PDA AUDIO FAULT

[Altz-]

I AM NEW TOREPAIRING ELECTRONICS AND HAVE DONE SOMETHING STUPID, I GUESS. MY HP 720 JORNADA PDA HAD AN INTERMITTENT AUDIO FAULT. THERE WAS NO AUDIO OUTPUT TO SPEAKER OR JACK SOCKET UNLESS I PRESSED ON THE CASING ABOVE THE SOCKET. I PRESUMED THAT THERE MUST BE A BROKEN TRACK OR BAD SOLDER JOINT AROUND THE SOCKET, SO I REMOVED AND RESOLDERED THE SOCKET AND TWO SURFACE MOUNT COMPONENTS WHICH WERE LINKED TO THE SOCKET OUTPUT CHANNELS. NOW I HAVE NO AUDIO AT ALL. EVEN THOUGH I ONLY TOUCHED THE SOLDER PADS ON THE SURFACE MOUNTS VERY QUICKLY, WOULD I HAVE DAMAGED THEM ? PUTTING A METER ACROSS EACH ONE, I READ 150KOHM ON ONE AND 5 MEG ON OTHER. I CANNOT FIND A SCHEMATIC ON THIS PCB. HP WON'T SUPPLY ANY INFO TO ME.



CAN ANYONE HELP ME PLEASE.



MANY THANKS,



KUNIA



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[Tomi Engdahl]

THERE WAS NO AUDIO OUTPUT TO SPEAKER OR JACK SOCKET UNLESS I PRESSED ON THE CASING ABOVE THE SOCKET. I PRESUMED THAT THERE MUST BE A BROKEN TRACK OR BAD SOLDER JOINT AROUND THE SOCKET,

Broken solder joints or bad solder are possible sources in your case.
But the damaged part could as well be the connector itself.
I have found out that very often the actual 3.5 mm jack connectors
get damaged quite often nowadays. When there is an intermittent fault
near those small audio connectors, most often the connector itself
is the problem.

EVEN THOUGH I ONLY TOUCHED THE SOLDER PADS ON THE SURFACE MOUNTS VERY QUICKLY, WOULD I HAVE DAMAGED THEM ?

Depending on the soldering iron temperature and soldering it is more or less probable to damage surface mount component or soldering pads.

Other things that can do damage when soldering are ESD and leakage current on soldering iron tip. Proper tools and grounding practices
reduce the possibility of those to minimum.