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2.616 bytes |
Service Hints & Tips |
Document ID: RMIE-3ETE3M |
TP755C/CS - Battery not charging on AC
Applicable to: World-Wide
Symptom:
9545 755C BATTERY NOT CHARGING ON AC POWER
A small number of 755C and 755CS systems may not charge the main battery during AC operation when using the following 35 Watt AC Adapters:
35 WATT ADAPTER FRU
P/N85G4951
P/N85G6693
P/N85G6691
On affected 9545 755C 755CS systems, the charging circuit could interpret signal strength from a 35 watt AC Adapter as though it was a Car-Battery Adapter. This would only allow main battery charging while the system was off.
Solution:
To determine if this is occurring, shut the system off and unplug and plug the 4-pin power connector at the back of the system - then turn the system on and check for charging. Do this multiple times. This action resets the charging circuitry, allowing the system to intermittently recognize the power supply as a 35 Watt Adapter and allow charging during operation.
If the system charges the battery during the test, a 40 Watt 4-pin AC Adapter should be used on the system.
If the system does not charge the battery during the test, follow normal problem determination to determine the cause of the failure.
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Search Keywords |
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Hint Category |
Power | |
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Date Created |
03-03-97 | |
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Last Updated |
22-04-98 | |
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Revision Date |
11-04-99 | |
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Brand |
IBM ThinkPad | |
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Product Family |
ThinkPad 755C/CS | |
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Machine Type |
9545 | |
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Model |
Various | |
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TypeModel |
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Retain Tip (if applicable) |
H135471 | |
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Reverse Doclinks |