HELP SONY CDP-XE800 failure

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Hallo from Poland - sorry for errors in my english !!!
I have a problem with SONY CD-player CDP-XE800. After some basic mechanism
cleaning. The player stop working. Firstly the sound was very silent -
MUTING was always ON. I tried to find what happend - after fer voltage
measurements (I am sure I did not make any shorts and ESD discharges) the
player stopped to respond on load/eject knob - it displays "OPEN", "PLAY"
etc but the load and sled motors are not working and the laser does not lid.
There is a chip controlling o/c motor - LB1641 and it has zener diode 4,7V
connected to pin 4 - it sets the motor operating voltage - and there is 0,7V
on that diode. I exchanged the diode and the LB1641 - no result (only the
diode voltage is now 1,7V). The LB1641 is controlled by the main processor
directly with 2 pins - combination of "0" and "1" on that pins sets the
turning direction - and there is "1" on both pins (and on the processor
terminals also) - that is "braeking" state for motor. Also the other
processor ports driving sled motor and laser (focus etc) and MUTE are set
HIGH. That leads me to conclusion - the main processor is failed. But the
dac chip (CXD8505BQ) is hot and the audio processor is slightly hot - so I
am not sure - maybe the failure is in another component or circuit - not in
the processor itself. So I decided to write to your forum - maybe someone
did already have similar problem and will be able to help me.
I will be gratefull for any suggestions.
Best Regards
Andrzej Stelmach
Poland




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