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Acer Travelmate 5742 wont charge battery

Acer Travelmate 5742 will not charge the battery. I replaced the charger with an original Acer 19V 3.42 Amp unit from acer and the battery too with a brand new original one. Machine works fine, but will not charge the battery. The same charger and battery works fine in another notebook.

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  • Riaan May 06, 2013

    It turns out that the main board was a bit damaged, and Acer wanted to replace it which cost more than a new laptop. So then I searched and found a service manual for the Acer travelmate 5742 series (covers some other models too) but this only told me how to disassemble the unit and not what to check exactly on the main board. So then I found out the motherboard is made by Compal model LA-5892P, and I searched for a schematic diagram for it and found it on some Russian site. On page 39 of the manual is the entire charging circuit. I found that a diode (PD13) has broken off the board, so I replaced it.

    The entire charging circuit is driven by PU17 which is a ISL6251 battery management chip, and all the components around it.
    If you can solder neatly and you can diagnose a little electronics then this link will be helpful:
    http://www.s-manuals.com/manuals/motherb...

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Specs ms2132


I hope this is useful; it's rather scanty
From the 2300 TM series manual (available from the acer website): 65W AC adapter 19V 3.42A

Or have a look at this
http://www.ukbatteryfast.co.uk/acer-travelmate-230-power-adapter-charger-p-1130
webpage. I think it's for a compatible power adapter, rather than an original Acer one, but it gives pictures of the connector.

Try www.acer.com > support > chat and see if they can be more helpful and specific

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The solution to your problem lies in one of the following three areas:

1.) Your charger is faulty and is therefore not able to pass power to your laptops battery.

2.) The charging connector on the laptop has come loose from the contacts. Therefore a bad connection.

3.) Your battery is faulty.

I think possibility 2 is the most likely, although you will have to test possibility 3 by removing the battery and plugging in your charger and seeing if the laptop powers on.If it does power on then that rules out possibility 1 and 2 leaving a faulty battery.

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The solution to your problem lies in one of the following three areas:

1.) Your charger is faulty and is therefore not able to pass power to your laptops battery.

2.) The charging connector on the laptop has come loose from the contacts. Therefore a bad connection.

3.) Your battery is faulty.

I think possibility 2 is the most likely, although you will have to test possibility 3 by removing the battery and plugging in your charger and seeing if the laptop powers on.If it does power on then that rules out possibility 1 and 2 leaving a faulty battery.

If you need to buy a new laptop charger, the following to adapters are for your reference:

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it sounds like one of three things:

1. Battery itself no longer functions
2. Laptop Charger has inadequate amperage
3. The motherboard is defective (most likely).

If you have another battery, or a friend with the same battery, you can try that first (and someone else's laptop charger).

If the problem is the motherboard, you can try to have it repaired but I don't trust many companies to do this kind of work. I outsource my motherboard jobs to a company called Laptop Rescue (http://www.laptoprescue.com/laptop-repair-2/). Coincidentally, they also sell laptop chargers in case that's the problem. Hopefully it's just a charger or battery issue and not a motherboard.

If you can confirm your laptop charger is dead, just purchase a new one:

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