LG C3400 Service Manual page 50
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Also See for C3400:
- User manual (297 pages) ,
- Specifications (4 pages) ,
- User manual (135 pages)
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(1) Checking Regulator Circuit
TEST POINT
CIRCUIT
RF2.85V
C536
4.7u
(1608)
Checking Flow
Voltage at
Pin5 of U503
Is 2.85V?
YES
Regulator Circuit is OK
See next Page to check
VCTCXO
U503. 3
Figure 4-2
U503
5
1
OUT
IN
2
GND
4
3
BYP
EN
C535
22n
MIC5255-2.85BM5
NO
Pin3 of U503
YES
Replace U503
- 49 -
U503. 5
RF_LDO
VBAT
CLKON
C539
4.7u
(1608)
Level at
NO
Is high?
4. Troubleshooting
Change main board
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