Troubleshooting Guide - IBM T541 Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK
J702 PIN 1 VOLTAGE
(12V) ?
YES
CHECK
J702 PIN 4 VOLTAGE
(5V) ?
YES
CHECK
X501'S WAVEFROM
OSCILLATE AS
24MHZ ?
YES
CHECK
J501
WAVEFROM?
YES
CHECK KEY CONTROL

TROUBLESHOOTING GUIDE

1. NO POWER
NO
NO
NO
NO
- 11 -
CHECK THE OUTPUT
OF POWER BOARD
CHECK THE OUTPUT
OF POWER BOARD
CHECK X501.
CHECK U502
PIN 25, 26, 30, 31