Bang & Olufsen BeoPlay V1-40, Руководство по обслуживанию

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3.6 Fault flow chart
Replace PCB49,
Backlight Driver
Confirm voltage
between PCB49, P3
pin 1 and pin 2 and
between pin 5 and
pin 6 is approx. =
50V?
No
Yes
Hint:
Measurement plugs,
pins and test points;
see page 3.17
From page
3.5 or 3.7
Check V-by-One
cables W30
between PCB01
and T-CON
OK?
Check PCB04, P18
pin 9, 11 P12V_
TCON = 12V
OK?
Replace cable or
re-establish
connections
Check PCB04, P18
pin 13
TCON_ON = 3.2V
OK?
Replace PCB04,
Power Supply Unit
Replace PCB01,
Video Engine
Replace PCB01,
Video Engine
Replace LCD
Confirm signal on
L4800 pin 2 *
OK?
L4803
IC4804
P121
L4804
IC4805
L4805
IC4806
IC4830
L4830
R4
85
9
R4
86
0
D4827
R4
89
2
R4
86
1
R4
85
5
R4
86
3
R4
92
5
R4
87
9
R48
51
R4852 R485
4
R4
85
7
R4
891
R4862
R4
84
9
R4
85
0
R4
85
8
FE1
02
C1
12
C1
09
C1
08
L4800
IC4802 IC480 1
L4801 L4802
IC4803
C1
08
L4800
802 IC4 801
L4
L4800, pin 2
Measuring on L4800, pin 2 with signal from a source Measuring on L4800, pin 2 without signal but with Menu
* Measurment point
0.2 V / div 0.2 V / div
5 ms / div 5 ms / div