No Function In Bm5 - Bang & Olufsen beosound 5 Service Manual

3.2 Fault flow chart
Fault symptom:

No function in BM5

Possible causes:
Defective PCB01,
Motherboard
Defective PCB4, SMPS
Defective PCB51, ML-PL
Defective 94, HDD
Confirm mains
connection is ok by
Replace mains cable
measuring on PCB4,
P19, pin1-2
OK?
Does the status LED
shine red ?
** PCB04, P18, pin 2-3
+5V_SB on PCB04,
On PCB51 confirm*:
Push the POWER
button on the rear
panel, and confirm
the power-up
sequence
OK?
Done
Poor or defective
AC connection on
PCB04, Power
OK?
Replace PCB04,
Power Supply
Disconnect W10
from PCB04, P18,
and confirm Replace defective
+12V_BUS on PCB04, Power
P18, pin 23. OK?
Reconnect W10.
Confirm 0V on
+3V3_ATX,
PCB51, P101 pin 9
+5V_ATX,
+12V_Bank
OK?
Disconnect W9
from PCB94, HDD
and W12 from
Replace defective
PCB51, P150.
PCB01,
Motherboard Confirm the before
mentioned voltages
again* OK?
Reconnect W9 to
PCB94, HDD.
Confirm the before
mentioned voltages
BeoSound 5.
Please refer to the
next page.
Supply
Supply
Replace defective
PCB01,
Motherboard
OK?
Disconnect W5
from PCB51, P101.
Confirm the before
mentioned voltages
again*
OK?
Replace defective
PCB01,
Motherboard
Replace defective
PCB94, HDD Power
again* Supply
OK?
Fault in
*Measuring points
PCB51
GND
+5V
+3.3V
+12V
+5V
Replace defective
PCB51, ML-PL
** Status LED on BeoMaster 5
No
Yes
Voltage
MASTER UNIT IR SPDIF MASTER LINK LINE OUT
Y
DVI-I S-VIDEO
5 V DC
VIDEO
1.0 A
POWER LINK
Pb Pr
R L