LG KF750 Service Manual page 143

4. TROUBLE SHOOTING
4.16.4 Step 4: Checking VCC
TP06_RF
C503 (VDD_E)
C503 (VDD_E)
C 1 2
V D D _ A
AB3000
B 1 1
E X T L D
O
F 1 2
V D D _ D
D 1 2
V D D _ E
Check Point
VDD_A (C501)
Check Point
VDD_E (C503)
LGE Internal Use Only
(Bottom)
Figure 4-5-1. Power for Radio ASIC
TP05_RF
C501 (VDD_A)
C 5 0 1 C 5 0 2 C 5 0 3
1 u 1 u 2 2 . u
Figure 4-5-2. Schematic (Power)
2.8V OK?
Yes
1.8V OK?
Yes
Common Input Power is OK
See The Next Part
- 144 -
AB3000
VRADA_2V8
(RF3000 analog)
R 5 0 4
0
VDIGRAD_1V8
(RF3000 digital)
TP06_RF
C503 (VDD_E)
Check the AB3000
No
Check the AB3000
No
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP05_RF
C501 (VDD_A)
C501 (VDD_A)