Dell 2005FPW Service Manual - Page 14
Troubleshooting Guide
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UPC - 012345698705
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TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) 1 CHECK J101 VOLTAGE PIN6, 7, 9(5V)? YES CHECK 2 U403 PIN32 Voltage (3.3V) ? YES CHECK KEY CONTROL CONNECTOR ROUTINE YES U401, R435, R436 3 PIN3, PIN4 VOLTAGE REPEATED AS PULSE SHAPE? YES CHECK DATA LINE CONNECTION(U403, U401) NO CHECK POWER BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO CHECK 3.3V, 5V LINE (OPEN CHECK) NO CHECK U402 VCC X-TAL, RESET Waveforms 1 J101-#6,7,9(5V) 2 U403-#32(3.3V) 3 U401, R435, R436-#3, 4 - 14 -
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- 14 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK KEY CONTROL
CONNECTOR ROUTINE
CHECK DATA LINE
CONNECTION(U403, U401)
NO
NO
NO
CHECK POWER BOARD, AND
FIND OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK
3.3V, 5V LINE
(OPEN CHECK)
CHECK U402 VCC
X-TAL, RESET
YES
YES
YES
YES
CHECK J101 VOLTAGE
PIN6, 7, 9(5V)?
CHECK
U403 PIN32 Voltage
(3.3V) ?
U401, R435, R436
PIN3, PIN4
VOLTAGE REPEATED AS
PULSE SHAPE?
1
2
3
1
2
Waveforms
J101-#6,7,9(5V)
U403-#32(3.3V)
3
U401, R435, R436-#3, 4