IBM T541

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TROUBLESHOOTING GUIDE
1. NO POWER
CHECK X501.
CHECK
X501’S WAVEFROM
OSCILLATE AS
24MHZ ?
NO
CHECK THE OUTPUT
OF POWER BOARD
CHECK
J702 PIN 4 VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
CHECK THE OUTPUT
OF POWER BOARD
CHECK
J702 PIN 1 VOLTAGE
(12V) ?
NO
CHECK U502
PIN 25, 26, 30, 31
CHECK
J501
WAVEFROM?
NO
YES
YES
YES
YES
CHECK KEY CONTROL