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How do I repair the charger portion of the unit without replacing the entire unit

Don't know where to start

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No make and model # makes answering difficult so I'll have to give very general information. Also I'm assuming this is well out of warranty - otherwise call the manufacturer first. Now, when we start without any schematic we trace backwards from where we know the circuit should end. In this case you start at the battery terminals since you're trying to find the charging circuit. It is more difficult today since if there's a microprocessor in the mix it could be controlling when a given line is active, when the charging line is connected to the battery, or not. The charging circuit will be a constant-voltage circuit for Li-Ion batteries ~ 3.7 Volts depending on the battery. If it is Lead-Acid it will probably be 13.8 - 14.0 volts, if Ni-Cd or Ni-MHd then it depends on the size of the battery pack and again will probably be a max voltage of about 1.25V/cell * Number-cells. Once you find the circuit you can test to see if there is any output voltage and current when it is "on" - if it never turns on then the problem is either the circuit is dead or the CPU is not turning it on - if the CPU controls this. If you can find the line from the CPU to the charging circuit see if it ever changes state, if not you could try "forcing" a different state, ie, it the state is always off (usually a 0 Voltage) then try finding the voltage line to the CPU and place that voltage on the CPU to Charger circuit line. If the line is always high (anything from 3.3 V to probably 5V depending on the CPU's power requirement) then try lowering the voltage to a 0 state. This is much more difficult since it may require cutting the line from the CPU to the charger. If either of these gets the charger to work then the problem is with the CPU, if nothing gets the charger to work the problem is the charger.

Posted on Nov 24, 2014

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