Samsung SGH-600BL User Manual Page 24

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  • TROUBLESHOOTING
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5-4 Samsung Electronics
Troubleshooting
INITIAL OPERATION
Initial Failure
Check for the clock
signal at U408 pin 83?
Is it present
‘CSROM’ signal on U833
(flash rom) pin 26?
Check all the other connection
between U300 (flash rom) and
U450 (kernel)
Check the clock generation circuit
(related to U201 and U200)
Check and repair the important
signals of U408 as follows
U408 pin 28 =
‘H’ (SYSRST)
U408 pin 77 =
‘H’ (BOOT)
U408 pin 84 =
‘H’ (DACT)
U408
pin 37 (BUSREQ), pin 75
(MSIZE) = ‘H’
U408 pin 74 =
‘H’ (EXTPROC)
Pin 54
(REFTXP) 3.0V
Pin 53 (REFTXN)
0V
Pin 56
(REFADCP) 2.6V?
Pin 58 (REFADCN)
0.3V?
Resolder all pins of U408
Check the circuit around LCD
Check the circuit around U452
(E
2
PROM) and data stored in it
END
Check U843
Check R433 and
related circuit
Check R428 and related
circuit
Resolder U408 pin 37, 75
Resolder U408 pin 74
Check R471, R472, R473
Check R470, R435, R469
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Yes
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