Compaq R3000 Laptop (AMD Processor) Charge Circuit Problem

[[email protected]]

Hello All,
My laptop no longer charges the battery. I need a motherboard
schematic or at least somebody that knows what 'normally' dies in that
circuit. There is a current sense resistor in the charge path, and
some FETs that i cannot find a datasheet for. There must be some
comparators somewhere in there controlling the FETs. Dose anybody know
about this circuit,or have a schematic??

Thanks!!!
-Stephen

 

[Electronic Elephant]

Hello All,
My laptop no longer charges the battery. I need a motherboard
schematic or at least somebody that knows what 'normally' dies in that
circuit. There is a current sense resistor in the charge path, and
some FETs that i cannot find a datasheet for. There must be some
comparators somewhere in there controlling the FETs. Dose anybody know
about this circuit,or have a schematic??

Thanks!!!
-Stephen

It seems a difficult mission.
A schematic...

 

[webpa]

Hello All,
My laptop no longer charges the battery. I need a motherboard
schematic or at least somebody that knows what 'normally' dies in that
circuit. There is a current sense resistor in the charge path, and
some FETs that i cannot find a datasheet for. There must be some
comparators somewhere in there controlling the FETs. Dose anybody know
about this circuit,or have a schematic??

Thanks!!!
-Stephen

Most likely failure: Broken solder joints on the DC input connector.
Fix: disassemble enough to reach the solder side, re-solder. It is
much easier to find instruction on disassembly than a schematic. If
you REALLY need a schematic, then the machine is not repairable.

 

[Bob Shuman]

Have you tried a replacement battery pack and if so does it behave the same
way? Many times the charging circuit/charger is fine, but the battery pack
itself pops a thermal fuse so will no longer charge.

Bob