faulty charging circuit on motherboard.

September 5, 2011 at 07:41:01
Specs: Windows 7
An 18 month old samsung r530 laptop has a faulty charging circuit and can only be used with mains power. How to access the motherboard and locate the charging circuit; is it possible to repair, depending upon component?
I have replaced the battery with a new samsung-branded one and the diagnosis has been confirmed by laptop serviceman - sorry not to have included this information.

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September 5, 2011 at 07:50:13
Your battery may not be able to accept a charge. If there is such a thing as a charging circuit on the motherboard it most certainly is not repairable. I suspect the circuit would be located in the AC power pack anyway. I could be wrong.

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September 5, 2011 at 07:57:32
Agree with OTH. Likely the battery is the culprit, especially if there's some indication (LED, Icon on desktop) that the circuit/charger is attempting to charge the battery. Even quality OEM machines can be stuck with cheap batteries, so after 18 months, I'd be more suspicious of the battery than the circuit/charger.

"Channeling the spirit of jboy..."

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September 5, 2011 at 08:01:38
Problems with the charging circuits inside a laptop are relatively rare, especially for a laptop that is only about 18 months old, unless some external event happened - e.g.
- someone dropped the laptop, or otherwise exposed it to a physical jolt
- someone spilled liquid on the laptop, or exposed it to liquid such as rain, or sprayed it with liquid
(it may not have been you that did those things - anyone who has had physical access to the laptop could have done one of those things, and have not told you.)
- there was a power failure event that produced power spikes or surges, or there was a lightning storm in your area, while the AC adapter was plugged into the laptop.

It's much more likely you have a problem with the AC adapter's cord or plug that plugs into the laptop's jack, or with the laptop's jack..

Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.

See response 1:

If there is nothing wrong with your AC adapter or it's connection and the jack in the laptop.......

It's not likely an ~18 month old battery would have this problem - an internally shorted battery - but it's possible....

Laptop main batteries usually work as they should for a year or so, then they begin to rapidly deteriorate. From what I've seen, by two years they cannot be charged to anywhere near their full capacity, and it gets worse after that.
They often develop internal shorts when they are older. If the battery gets HOT rather than just warm after you have attempted to charge it for at least a half hour, or after you have been using the laptop for a while with the AC adapter plugged in, it's definitely internally shorted and you must replace it. Internally shorted batteries getting too hot have been known to cause the laptop to catch on fire.

The charging circuits inside the laptop may be on a small separate circuit board, often one the power jack is directly attached to
Samsung may have a free Service or Maintenance manual you can download to find out how to take apart the laptop series properly, or if not, you can usually find one on the web for free or for a small fee.

Tips about battery charging problems on Dell laptops - may apply to other makes.
See response 3 in this by iTech:

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September 5, 2011 at 18:51:40
Just for your information:

You have to be a little bit crazy to keep you from going insane.

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