LG CG225 Service Manual page 77

4. TROUBLE SHOOTING
4.16.1 Checking Regulator Circuit (Rx pass continued)
Check P in 5
2.85V?
No
Pin 3 H igh?
No
Check U1 02
PIN3
Yes
Regulat or circuit is OK
See next page to check
VCTCXO circuit
Yes
Repl ace U503
PIN5
VBAT
RF_EN
C560 C532
1000p 4.7u
Ch2 : Pin 5 2.85V
Ch1 : Pin 3 2.67V
- 76 -
RF2.85V
U503
1 5
VDD VOUT
2
GND
3 4
CE NC
R1114N281D-TR-F
C533 C534
NA 10u
C535
1u