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5 Troubleshooting
5-1 No Power
29":Does proper DC 28 V appear
at DC jack connected to CN28?
40":Does proper DC 28 V appear
at DC jack connected to CN29?
Yes
Does proper DC 5 V appear at
Pin 17 of CN201?
Yes
Does proper DC 5 V appear at
Pin 2 of IC952, IC955 and IC 958 ?
Yes
Does proper DC 3.3 V
appear at Pin 2 of IC953,
IC954, IC956 and IC957?
Yes
Does proper DC 2.5 V appear at
Pin 2 of IC961 and IC964?
Yes
Check IC963, IC906 and IC905.
LTM295W/LTM405W
No
Check SMPS PCB and Adapter.
No
Check CN201 and related circuit.
No
Check IC952, IC955 and IC 958.
No
Check IC953, IC954, IC956 and IC957 .
No
Check IC961 and IC964.
CONFIDENTIAL
5-1
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