Samsung STH-N271 Service Manual page 5

2. STH-N271 Trouble Shooting
1. Baseband Section
1-1. Program No Running
Press END Key
Y
ON_SW=H
Y
VBAT>3.2V
Y
VCC=3.0V
V_VCTCXO=3.0V
RST=3.0V
IVCC=2.2V
BOOT=H
Y
VCTCXO_IN=14.4MHz
32K_XIN=32.768 kHZ
Y
Memory (U202)
control signal OK?
Y
Program Running
N
Replace dome S/W
N
Need to check
Q107, Q106
N
Need to check
Q107, Q106
N
Need to check neighbor part
Need to check OSC320,
Y201 & neighbor part
N
Need to replace
Memory(U202)
SAMSUNG Proprietary-Contents may change without notice
VCC, ADD(0:21), DATA(0:15),
FLASH_CS, SRAM_CS, UBE,
MEMOEB, MEMWEB
2-1