No Sound From Beomaster 5 - Bang & Olufsen beosound 5 Service Manual

3.8 Fault flow chart
Fault symptom:

No sound from BeoMaster 5

Possible causes, defective:
W2, SPDIF cable
PCB51, ML-PL
PCB01, Motherboard
PCB04, Power Supply
On PCB51, ML-PL
confirm by LED*:
+3V3_ATX,
+5V_ATX,
OK?
Disconnect BM5 from the mains.
Connect a pair of B&O speakers to BM5 and
reconnect to the mains. Await for the start-up
procedure to finish, and activate N.Music.
Does the connected speaker turn on?
Check W2, SPDIF
cable
OK?
Replace PCB51,
ML-PL
OK?
Replace PCB51,
ML-PL
Replace PCB51,
Replace W2, SPDIF
cable
Replace PCB01,
Motherboard
ML-PL
*Measuring points
Yes
PCB51
GND Voltage
+5V
+3.3V
+12V
+5V
No