SAMSUNG SGH-N300
Instrukcja Serwisowa

5-2 Initial

Initial Failure

Downloading SW is OK ? (Is CSROM signal OK ?)

No

After power on, check and repair the important signals of U108 as follows

Yes
The node between R162 and C183 = "H" (RST)

No

Check the circuit related to reset

Yes No
R114 = "H" (BOOT) Resolder R114

Yes
Check all the other connection by Test S/W R150 = "H" (GPIO4)

No
Resolder R150

Yes
Check the circuit around LCD

No
R165 = "L" (GPIO2) Resolder R165

Check the circuit around U107(EEPROM) and data stored in it Replace PBA

END

5-3

Flow Chart of Troubleshooting