Only For Training And Service Purposes - LG GT500 Service Manual

4.16.4 Checking VCC
TP1
AB3100
K13
OA_OUT
C12
EXT_LDO EXT_LDO
L12
OD OUT
G14
Check Point
VRADA_2V8
Check Point
VDIGRAD_1V8
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Only for training and service purposes

Main Board (Bottom side) : Power for Radio ASIC
R302 0
R303 0
R304 0
R305 0
C302 C303 C304
2.2u 2.2u 2.2u
VDDC_2V65
TP2
2.8V OK?
(TP1)
1.8V OK?
(TP2)
Common Input Power is OK
See The Next Part
AB3100
TP1
VDDA_2V8 VDDD_2V65 VDDE_1V8 VDIGRAD_1V8
VDDH_2V75 VDDF_2V5 VDDG_2V85
No
Yes
No
Yes
- 127 -
4. TROUBLE SHOOTING
TP2
VBAT
VBAT
to RF3300 Power Detector
VDDA_2V8
VDDD_2V65 to AB3100 CODECs/ADC/PLL
VDDE_1V8 to All I/O Supplies and Memory
VDIGRAD_1V8 to RF3300 digital
VDDK_2V75
Check the AB31000
Check the AB31000
LGE Internal Use Only