4. TROUBLE SHOOTING
- 98 -
KEY BACKLIGHT
390
R105
LD110
LEBB-S14H
LD113
LEBB-S14H
LD106
LEBB-S14H
4.7K
R123
390
R112
LD101
LEBB-S14H
390
R118
390
R117
LD107
LEBB-S14H
LD104
LD118
LEBB-S14H
LEBB-S14H
LD117
LEBB-S14H
390
R110
390
R116
LEBB-S14H
LD109
R108
390
R107
390
LD111
LD115
LEBB-S14H
LEBB-S14H
LD103
LEBB-S14H
LD116
LEBB-S14H
R122
4.7K
LEBB-S14H
LD114
LEBB-S14H
LD102
Q101
UMT2222A
390
R113
R111
390
390
R103
390
R121
LD108
LD105
LEBB-S14H
R115
390
LEBB-S14H
390
R114
R120
390
R109
R119
390
LEBB-S14H
390
LD112
R104
390
VBAT
390
R106
LEBB-S14H
LD119
KEY_BACKLIGHT
CIRCUIT
START
Is the level at R122
High?
NO
Check U101(Main board)
YES
Are all LEDs
Working?
NO
YES
Check the soldering
each R and LED
Backlight will work properly.
NO
Replace or resoldering
component
R103~R121
LD101~LD119
CHECKING FLOW
Figure 4-40.
Figure 4-41.
Summary of Contents for KG920
Page 3: ... 4 ...
Page 48: ...3 TECHNICAL BRIEF 49 3 8 2 AFE Analog Front End Figure 3 22 ...
Page 52: ...3 TECHNICAL BRIEF 53 3 8 5 MBGM01 5M CCD ISP Figure 3 25 ...
Page 55: ...3 TECHNICAL BRIEF 56 3 8 6 MV8620 5M back end IC Multi Media Function Figure 3 26 ...
Page 58: ...3 TECHNICAL BRIEF 59 3 9 MIDI IC YMU787 Figure 3 27 YMU787 BLOCKDIAGRAM ...
Page 108: ...4 TROUBLE SHOOTING 109 CIRCUIT WAVEFORM Figure 4 59 Graph 4 11 Figure 4 60 Figure ...
Page 109: ...4 TROUBLE SHOOTING 110 TEST POINT U602 FB602 U100 Q100 Q101 C113 C114 Figure 4 61 Figure 4 62 ...
Page 112: ...4 TROUBLE SHOOTING 113 Figure 4 67 Figure 4 68 CIRCUIT ...
Page 115: ...4 TROUBLE SHOOTING 116 WAVEFORM Graph 4 13 ...
Page 139: ...6 BLOCK DIAGRAM 140 6 BLOCK DIAGRAM Figure 6 1 ...
Page 148: ... 149 8 PCB LAYOUT ...
Page 149: ... 150 8 PCB LAYOUT ...
Page 150: ... 151 8 PCB LAYOUT ...
Page 151: ... 152 8 PCB LAYOUT ...
Page 152: ... 153 8 PCB LAYOUT ...
Page 153: ... 154 8 PCB LAYOUT ...
Page 154: ... 155 8 PCB LAYOUT ...
Page 155: ... 156 8 PCB LAYOUT ...
Page 163: ... 164 ...
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