Samsung SGH-U100 Service Manual

Also see for SGH-U100: User guide

Flow Chart of Troubleshooting3-3VEXT6P4SSV31R MCVXV1D QANEOXVLDO_5A14VLDO_6C12VLDO_7A10VREF41R NGERV31M PGERVH11VRTCK12VSIM5G1SSV4K2SSV2R3SSVVEXTF15VIB_DRV9L NE_GNR_BIVVL4S_A A12B11VL4S_BD10VL5S_AVL5S_B C9G11VLDO_1J12VLDO_2A13VLDO_3B12VLDO_4B106N3DDVC11VDD3401C5DDV31B76DDV6ABDDV11NDDDV11LVDDV5N1OI_DDV4J2OI_DDV4CLTCO_DDVE14J11SIM_IO K11SIM_RST7E PXTN9UP_CLKUP_IO P10R10UP_RSTF14VACCE13VBAT3J1DDVJ13VDD123M2DDVPIXTXR6C NQXTXR7C PQXTXRL8SCLK_PSCSDI_PSC M7N7SDO_PSCC2 SERCKSERDAC1SERLE1B1A2 SERLE2K14SIM_CLK41C 2WS_RWP6B 1FERAR5B 2FERARRESETN_CSPR39K O_TESERRING_DRV F13H10RTC_ALMN4N KLC_CTRL2 RWN6D NIXTXR7DOCTL0OCTL1C5F5 OCTL2OCTL3E5A4 OCTL4OCTL5G6B3 OCTL6OCTL7A37L FUB_1WSP9M PEEK_RWP51C N1WS_RWPL3G13LED1_DRVG12LED2_DRV6R CM41M NNICIM41N PNICIM51P NTUOCIMPTUOCIM51N01N EDOM5CN 126CNE68G6SDNG9G7SDNG01G8SDNG6H9SDNG31PVDNG11FRUCH_DNG4BLTCO_DNG51B1CSP_DNG51K2CSP_DNG01L QRTNII|O11SDNG21SDNG 9H7J31SDNG8J41SDNG9J51SDNG01J61SDNG01K71SDNG8F2SDNG9F3SDNG01F4SDNG7G5SDNGG3 DB6G4 DB7F4 DB8F1 DB93P RTNID6FBDNG01MDDNGQDNG 8E7F1SDNG7H01SDNG8HDB1K2F2 DB10F3 DB11E2 DB12E3 DB13D3 DB14D2 DB15K3 DB2DB3J5J6 DB4H5 DB531D3CDA_XUACH_BDRV E11F12CH_ISEND14CH_RESCREF E9CSN_PSC K84R KCIAD6L IDIAD6M ODIAD4P NRIADK1 DB0ADC_AUX25P 4XUA_CDA9D CFA21N NATUOA11P PATUOA21P NBTUOA21R PBTUOA41L NNIXUA51M PNIXUA31L NTUOXUA31K PTUOXUAK6 AB0AB1P1L5 AB2AB3N1N2 AB4AB5M2M1 AB6AB7K7K5 AB8E10ADC_AUX1D15U300VCCA_2.9VC310VBATVCCA_2.9VC6GND 2VCC54 YU3041AB 3VRF_2.9VVRTC_1.5VVCCD_2.9VTH300C319C336VCCD_2.9VC317VBATC309R314C318R3002.2KC344VCCD_2.9VVCCB_2.9VR309VCCD_1.8VBAT30012R326C301C339R343R328C320USB_5VR342R341C338R307R306VBATR340C303R308C316 C321 C322C302C313 10VVCCD_1.8V_PSCC337523DZR312VCCB_2.9VVLDO1_1.5VJIG_ON_IFVIB_DRVNTUOCIM PTUOCIM NNICIM PNICIMNBTUOA PBTUOA NATUOAPATUOANQXTR PQXTRNIXTR PIXTRCPAV CFAPWR_ONVIB_ENINTRQPWR_KEEPVBATRSTPSW1_BUFTNI_PSDCM_M31KLC QANEOX K23KLCNTUOXUA PTUOXUA NNIXUA PNIXUAUP_SDIBAND_SELMODE_SELTX_ENXOENASX_ENICHRGPAC_ENRX_ENSERLESERDATRTCALARMSERCLKDSP_AB(0)DSP_IOUP_CSDSP_RWNUP_SCLKFLASH_RESETUP_SDODSP_DB(0:15)DSP_DB(0)DSP_AB(8)DSP_AB(7)DCS_TX_ENDSP_AB(6)GSM_TX_ENDSP_AB(5)DSP_AB(4)DSP_AB(3)DSP_AB(2)DSP_AB(1)DSP_AB(0:8)DSP_DB(14)SIMDATADSP_DB(13)SIM_IODSP_DB(12)SIM_RSTDSP_DB(11)SIM_CLKDSP_DB(10)DSP_DB(9)VSIMDSP_DB(8)DSP_DB(7)DSP_DB(6)DSP_DB(5)DSP_DB(4)DSP_DB(3)DSP_DB(2)DSP_DB(1)EAR_CHECKSIMCLKDSP_DB(15)SIMRST