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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
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If the battery is only 4 or 5 months old it's not likely to be defective. As far as testing the charging circuit, you would still need to be absolutely sure your current battery is OK first as even a fairly new one could be defective.

Checking the charging circuit requires the use of test equipment and some disassembly of the machine. Usually, when the charging circuit is not working or is erratic, the problem is a defective DC input board. The board itself is not expensive but does require quite a bit of disassembly to change it out.

You can get some idea of cost and the procedure to change the board from this site which is located in the US: iFixit: The free repair manual

Regards.
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