Bang & Olufsen DVD 1 Mode D'emploi page 13

5.2 Repair tips, English
Repair tips
There is a problem with:
- Picture.
Analog video signals can be measured from PCB71.
For RGB or CVBS measure on 71-1603 or 2J15.
For Y/C measure on 71-1604 or 2J14.
If video signals are OK from PCB71, the fault may be located on PCB2.
- Sound.
Only digital audio signals can be measured from PCB71.
Try playback of an Audio CD. If OK, the fault may be located on PCB71 or PCB94.
If not OK, the fault may be located on PCB2.
- Both picture and sound.
Ensure that all voltages from PCB1 to PCB71 and to PCB2 are OK.
Measure if there is any activity on I2C DATA and I2C CLOCK on 1J6.
- Playback of DVD/CD.
Ensure that all voltages from PCB1 to PCB71 and PCB2 are OK.
Measure if there is any activity on MOTOR and TRAY on 1J1 and 1J10.
- Loader/tray.
Check for any mechanical failures on PCB94.
Measure if there is any activity on MOTOR and TRAY on 1J1 and 1J10.
- Display/Keyboard.
Measure voltage on 1J5. Measure if there is any activity on CS, K DATA and
K CLOCK on 1J5.
Ensure that voltage on key-pins 1J5 pin1-5 is pulled down when pressed.