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4. TROUBLE SHOOTING
CIRCUIT
VBAT
R103
390
KEY_BACKLIGHT
CHECKING FLOW
KEY BACKLIGHT
R104
R105
R106
R107
R108
R109
R110
390
390
390
390
390
390
390
R122
Q101
UMT2222A
4.7K
R123
4.7K
Figure 4-40.
START
Is the level at R122
High?
YES
Are all LEDs
Working?
YES
Backlight will work properly.
Figure 4-41.
R111
R112
R113
R114
R115
R116
390
390
390
390
390
390
NO
Check U101(Main board)
NO
Check the soldering
each R and LED
NO
Replace or resoldering
component
- 98 -
R117
R118
R119
R120
R121
390
390
390
390
390
R103~R121
LD101~LD119
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