LG MG180C Service Manual page 70

4.14.1 Checking Regulator Circuit (Rx pass continued)
Check P in 5
2.85V?
No
Pin 3 H igh?
No
Check U1 00
PIN3
Yes
Regulat or circuit is OK
See next page to check
VCTCXO circuit
Yes
Repl ace U502
PIN5
4. TROUBLE SHOOTING
VBAT
RF_EN
C533 C534
1000p 4.7u
Ch2 : Pin 5 2.85V
Ch1 : Pin 3 2.67V
- 69 -
RF2.85V
U502
1 5
VDD VOUT
2
GND
3 4
CE NC
R1114N281D-TR-F
C535 C536 C537
NA 4.7u 1u