Dell 2005FPW - UltraSharp - 20.1" LCD Monitor - Troubleshooting Guide; No Power Issues

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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