Samsung SGH E105 service manual

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SGH-E105 Block Diagrams

2. Base Band Solution Block Diagram POWER (DC/DC, CHARGER) X-TAL 13MHz

IRDA

TRIDENT ACC DSP16000 IO RWN AB(8:0) PPI RS232 (Programmable Peripheral I/O) GPIO DB(15:0) INT1 IRQx PAx RSTB ARM7TDMI IO RWN AB(8:0) DB(15:0) INT1 IRQx PAx RSTB SIM I/O SMART CARD X-TAL 32.768 KHz RTC EMI JTAG/ICE LCD KEYBOARD DSPJTAG JTAG DAICK DAIRN DAIDO DAIDI DAI

CSP1093
<RF DRIVER> TX I/Q RX I/Q TXP SERCK SERLE SERDA OCTL

TXIP TXIN TXQP TXQN RXIP RXIN RXQP RXQN SERCK SERLE SERDA RXOVL TXP OCTL RF SOLUTION - RFIC - PAM

ARM JTAG/ICE

AUDIO PART MCP 128M FLASH 16M SRAM AUDIO LCD Memory Part MOTOR B'D to B'D Connector
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4. SGH-E105 Flow Chart of Troubleshooting and Circuit Diagrams 1.Baseband
1. Power ON

'Power On' does not work

Check the current consumtion more than 100mA YES

NO

Download again

Check the Vbat(battery+) O Voltage more than 3.3V YES Check the pin 15 of U100 is more than 2.8V YES U100 pin 46,39 = 2.8V YES U100 pin 13 = 1.8V YES

NO

Charge the Battery

NO

Check U100 and C113

NO

Check C114 and C116

NO

Check C112

Check the clock signal at pin4 of U800 Freq=13MHz ? Vrms°300mV ? Vpp is around 900mVpp

NO

Check the clock generation circuit (related to OSC801 and U800)

YES 'Power On' does not work

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SGH-E105 Flow Chart of Troubleshooting and Circuit Diagrams

2. Initial
Initial Failure

Check the signal at the pin 28 of U100 is "High" when the phone is boot on

NO
Check U100

YES NO

Check the pin 22 of U100 is "High"

Check the U700

YES NO

Check the pin 4 of OSC801 is around 2.8V

Check the soldered status of OSC801, R803, U100

YES
Check and resolder LCD connector CN200 if there is solder bridhe between the pins

YES
END

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