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5-2 Initial
Initial Failure
Downloading SW is OK ?
(Is CSROM signal OK ?)
Yes
Check all the other connection
by Test S/W
Check the circuit around LCD
Check the circuit
around U617(EEPROM)
and data stored in it
END
SGH-N500 Flow Chart of Troubleshooting and Circuit Diagrams
No
After power on,
check and repair the important
signals of U467 as follows
The node
between R661 and C712
= "H" (RST)
R348 = "H" (BOOT)
R440 = "H" (MSIZE)
R438 = "L" (EXTPROC)
Replace PBA
No
Yes
No
Yes
No
Yes
No
Check the circuit
related to reset
Resolder R348
Resolder R440
Resolder R438
5-3
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