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Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
4. TROUBLE SHOOTING
XWWVXZ]
CHECKING FLOW
START
Is TP1 low
at KEY_BL_EN = high ?
NO
Check Q201
Are all LEDs
Working?
NO
YES
Check the soldering
each R and LED
Backlight will
work properly.
NO
Replace or resolder
component
YES
CIRCUIT
TP1
LD202
LD201
VA205
VA226
LD201
Q201
1
2
3
LD202
VA204
1.2K
R222
R268
10K
74
14
2
R
0.1u
C249
VBAT
13
2
R
74
KEY_BL_EN
KEY BACKLIGHT
TP1
LD202
LD201