Samsung SCH-i830 Service Manual page 50

Flow Chart of Troubleshooting
IRDA_TX
IRDA_RX
1
IO
2
GND
3
SIM VCC
BATT_BACKUP
KBR(0)
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ZD605
6
CLOCK
5
NC
4
ZD604
6
1
VCC30
2 5
IRDA_SD
3
4
KBR(1)
7-24
LCD_MCLK
LCD_DE