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SGH-D800 Flow Chart of Troubleshooting
2-
23
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2-2-4. DCS TX
U403
check or resolder
U101
check or resolder
Yes
Yes
No
U404
pin25,26,27,28
100mV ?
OSC400
check or resolder
No
U403
pin35 : 26MHz ?
Vp-p : 950mV ?
Yes
U101
pin
A13
,
B10
,
C113
,
C115
check or resolder
No
U403
pin16,41,31,29
: 2.9V ?
No
U101
check
U404
check & change
Yes
U404
pin 2 : 0V?
pin 3 : 3V?
Yes
No
U404 pin1
about 5dBm ?
Yes
U401 pin21
check
No
U404
pin 6 : 2.9V ?
Yes
BATTERY
check & change
No
U404
pin16, 17: 3.7V?
No
F400
check & change
Yes
U404 pin19:
about 30dBm?
C418
,
CN400
R406
,
ANT401
check & change
Yes
Yes
U101
check & change
No
F400
pin 3 : 2.6V ?
No
U404 pin 13 :
about 30dBm?
Summary of Contents for SGH-D800
Page 48: ...6 1 6 SGH D800 Block Diagrams ...
Page 49: ...SGH D800 Block Diagrams 6 2 ...