3-5
ONE POINT REPAIR GUIDE
3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET
When power on the set, any icons or characters on VFD are not displayed.
3-1. VFD
3-1-1. Solution
Please check and replace VFD300 on DISPLAY board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check if VKK, FL+ and FL- are output from SMPS to VFD via the MAIN board.
2) Check if IC105 outputs VFD_SDA, VFD_CLK and VFD_STB to the DISPLAY board.
3) Check the GR signal(pulse signal) of IC300 on the DISPLAY board.
Check the SG signal(pulse signal) of IC300 on the DISPLAY board.
If the GR and SG signal isn’t output, replace IC300 with a new one.
If the GR and SG signal is output, replace VFD300 with a new one.
3-1-3. Service hint (Any picture/ Remark)
VOL_LDE1 1
VOL_LDE2 2
VOL_LDE3 3
LDE4 4
OSC 5
DOUT 6
DIN 7
CLK 8
STB 9
K1 10
K2 11
VDD1
13
VSS1
12
SG1
14
SG2
15
SG3
16
SG4
17
SG5
18
SG6
19
SG7
20
SG8
21
SG9
22
23 SG10
24 SG11
25 SG12
26 SG13
27 SG14
28 SG15
29 SG16/KS16
30 VEE
31 SG17/GR12
32 GR11
33 GR10
39
GR4
38
GR5
37
GR6
36
GR7
35
GR8
34
GR9
40
GR3
41
GR2
42
GR1
43
VDD
IC300
44
VSS
PT6315
47u
F
/50V
C
331
0.1uF
C
300
R301
100K
C301
0.1uF
R302
100K
R303
220R
R304
220R
R305
220R
R306
100K
R307
100K
C315
0.1uF
C307
0.1uF
100P
C
308
100P
C
317
C
309
100P
R361
47R
C351
106
C352
106
VFD-STB
VFD-CLK
VFD-SDA
F-VKK
VDD+3.3V
P-STB
P-CLK
P-SDA
VDD+3.3V
VDD+3.3V
GD1
GD2
GD3
GD4
GD5
GD6
GD7
GD8
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
GND
GND
GND
GND
GND
GND
GND
GND GND
GND
GND
GND
GND
< Waveform of GR and SG signal >
SG signal
GR signal
GR SIGNAL
ABOUT 30 V
SG SIGNAL
ABOUT 30 V
Summary of Contents for CM2460
Page 11: ...1 10 ...
Page 13: ...2 2 ...
Page 15: ......
Page 17: ...3 SPEAKER SECTION A60R A60L ...
Page 46: ...3 29 13 14 4 USB USB_5V D D Figure 4 14 13 ...
Page 47: ...3 30 ...
Page 54: ...3 58 3 57 SMPS P C BOARD BOTTOM VIEW ...
Page 55: ...3 60 3 59 2 MAIN P C BOARD TOP VIEW ...
Page 56: ...3 62 3 61 MAIN P C BOARD BOTTOM VIEW ...
Page 57: ...3 64 3 63 3 DISPLAY P C BOARD TOP VIEW ...
Page 58: ...3 66 3 65 DISPLAY P C BOARD BOTTOM VIEW ...
Page 59: ...3 68 3 67 4 KEY P C BOARD TOP VIEW BOTTOM VIEW ...
Page 60: ...3 70 3 69 ...