Service manual

Troubleshooting
Samsung Electronics 7-9
All power is measured
correctly and front cable is
properly connected?
All clocks (20MHz,
33.8688MHz, 27MHz) of main PCB
oscillate normally?
Check A/V decoder signal process block.
Check all clock oscillating parts.
Yes
Yes
No
/CS2, /RD, /WR signal occur?
Check short pin out of micom
common-bus (8-bit).
Check short or operating of micom.
Check soldering of micom and
communication devices.
Yes
No
Play works?
Check VIC1 peripheral unit.
Yes
No
Yes
Yes
Yes
Yes
C
Key operation or
remote control error
MIC1-9 is fixed to 0V?
MIC7-4, 5 pin is fixed to 0V?
Check A/V decoder signal process block.
Check DVD signal process block.
Yes Yes
MIC1-10, 19
waveform state (0, 1)
changes whenever pressing
front key?
Check MIC1 peripheral soldering.
Yes
Check eith article
"No Front (SET) Operation"
No
C
No
No