Samsung STH-N275 service manual free download

File name Samsung STH-N275 service manual.pdf

1. Trouble Shooting 1. Baseband Section 1-1. Program No Running Press END Key Y ON_SW=H N Y Replace dome S/W VBAT>3.2V N Y Need to check Q107, Q106 VCC=3.0V V_VCTCXO=3.0V RST=3.0V N IVCC=2.2V BOOT=H Need to check Y Q107, Q106 VCTCXO_IN=14.4MHz N 32K_XIN=32.768 kHZ Need to check neighbor part Y Need to check OSC320, Y201 & neighbor part VCC, ADD(0:21), DATA(0:15), Memory (U202) FLASH_CS, SRAM_CS, UBE, control signal OK? N MEMOEB, MEMWEB Y Need to replace Memory(U202) Program Running SAMSUNG Proprietary-Contents may change without notice 1-1 Trouble Shooting 1-2. Abnormal LCD display ,EL Baob Light, Vibrator & Speaker Operation START Y VCC, ADD(2), DATA(0:7), LCD Control DISPLAY_CS, RST Signal OK? N Y Need to check U103 & neighbor part LCD Display Running Send Command EL enable Y EL_EN=H N Y Need to check R126, C148 EL Back light N OK? Y Need to check U104 & neighbor Part LCD Display Running EL Back lingt Running Send Command Vibrator enable Y VIBRATOR=H N