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
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Summary of Contents for SGH 600
Page 2: ...Samsung Electronics Co Ltd ELECTRONICS ...
Page 6: ...1 4 Samsung Electronics General Description MEMO ...
Page 20: ...3 4 Samsung Electronics Specification MEMO ...
Page 40: ...7 8 Samsung Electronics Electrical Parts List MEMO ...
Page 48: ...8 8 Samsung Electronics Exploded View and its Parts List 8 9 Hands Free Kit Diagram ...
Page 49: ...Samsung Electronics 8 9 Exploded View and its Parts List 8 10 Boost Kit ...
Page 57: ......
Page 58: ......
Page 59: ......
Page 60: ......
Page 61: ......
Page 62: ......
Page 63: ......
Page 64: ......
Page 65: ......
Page 66: ......
Page 67: ......
Page 68: ......
Page 69: ......
Page 70: ......
Page 71: ......
Page 72: ......
Page 73: ......
Page 74: ......