Question about IBM ThinkPad T23 2647 Notebook
I just went through this with my Think pad, used a volt meter and found the power supply was not putting out any voltage. Ordered a new one.
Posted on May 31, 2010
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Posted on Jan 02, 2017
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Zero-crossing signal problem
• The main PCB does not detect the zero-crossing signal (Z CROSS SIG) for the time specified below.
Poor contact in the connector terminals. - Check the connection of connectors YC1-3 on the main PCB and YC2-6 on the power source PCB, and the continuity across the connector terminals. Repair or replace if necessary.
Defective power source PCB. - Check if the zero-crossing signal is output from YC2-6 on the power source PCB. If not, replace the power source PCB.
Defective main PCB. - Replace the main PCB if C6400 is detected while YC2-6 on the power source PCB outputs the zero-crossing signal.
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