Question about Toshiba Satellite A75-S211 Notebook

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The Ac power supply on the motherboard gets hot and stops allowing the AC power to generate power and switches to battery and eats the battery power really fast. then won't charge until PC is completely cold.

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So the DC jack on the motherboard is Heating Up? I'm assuming the AC Adapter (charger cord) is also HOT...??

Here's what your issue is:

1. You're using the wrong volt/amp Adapter..(charger) For Example.. Your Laptop needs a 19.5v Adapter and you are using an 18.5v
2. You're using a "generic" AC Adapter and Not an OEM one.. the generic adapters will overheat and sometimes even melt due to Cheap capacitors/resistors being used..
3. You need to clean your Fan/Heatsink.. Clean the heatsink cooling fins to free blockage and stop overheating issue..
Or .... 4. Possible faulty battery

Posted on Nov 16, 2009

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1 Answer

Dometic AC B59516.711 15,000 BTU, while on generator power the AC works during day while it hot but once the sunsets and it cools down, compressor kicks on it drags the gen down and shuts it off.


something else besides the ac is stopping ( overloading) the genset
if it works well during the day, the compressor has to be working so the ac is not the problem
a 4000 watt gen set has a duty cycle load of around 3000 watts full time so any additional power requirement besides the ac will overload it
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It is possible that the auto power detect section has gone faulty and is switching in this shunting manner because of an error in the line detect section. The op amp is detecting a low voltage to switch on and doing so it goes back to power. This can be due to a frequency problem in the AC generator and so If you switch off the generator the fault must stop.
If so have the generator checked for frequency change or the UPS has a circuit error. Try to set the AC voltage of the generator up to the required level if there is a drop on load.

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Please understand that the generator produces power from fuel with an engine wheras the invertor is one which genrerates power from a stored battery using the principle of frequency switching a DC source to induct and produce AC.
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Helloi bought a new TR2424-230-50 inverter and 2 X 12V batteries connected. When charging with my 5KVA generator the generator frequency is very unstable and the amps (a/c) drawn is upto 10A. Is there a...


Frequency is a function of generator RPM. Slower the engine, lower the frequency. Faster the engine, higher then frequency.

Look at your generator first, it should be able to maintain this load without problems - check your governor.

You can try plugging in a lamp directly into the generator so that it won't see a pure inductive (input to inverter) load, but will also see the resistive load from the lamp.

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Are you feeding your generator into the inverter via the transfer switch, or are you plugging the coach power cord into the generator? The former would force all the AC loads to be switched by the inverter, the latter allows all ac loads to be powered, even those that you may not know about / realize (water heater loads are a big one) and eat up generator capacity.

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Hello,

the problem is from the motherboard. One problem with toshiba laptop, is that they overheat too much.

Check if the fan of your laptop is working and make sure you keep your laptop where there is ventilation, so that air can enter into the laptop.

You could also open up the laptop, clean every dust on the motherboard and also the fan and cooler.

That's the area you should concentrate your attention on and not the battery or AC adapter.

Take care.


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I have the feeling that the battery has to be in place to allow the AC power to be transferred to the mother board

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Dead Sony Laptop


If power supply is supplying correct voltage, then you do not need power supply PCB.

Try starting the laptop with AC adapter and no battery, if battery is shorting out you may get same problem.

Test the soldering joint on the AC socket and laptop motherboard, if there is a bad soldering on laprop ac adapter socket, you get same symptoms.

If it is none of the above, and the adapter is fine, then it is usually a faulty motherboard.

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Battery will not charge


Hi!

It's your ac adapter that is causing this issue. The ac adapter doesn't supply enough power or doesn't supply any power at all to the battery. Try to borrow another ac adapter from any inspiron system and if that works, then you need to replace the ac adapter, else, it's the motherboard.

Hope you find it helpful.

Thanks,

Karlox™ :)

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There is no manual way to switch from battery to AC, the machine or docking station should automatically switch between battery and AC. There is a power management chip inside the laptop that regulates the power and switches from battery to AC when plugged in. Some docking stations have a chip built into them to do this. Start by ruling out the power supply. Do this by undocking the laptop and plug it in using the power supply that is attached to the docking station and see if the machine is just running off of battery. If it is running off battery, then check the power supply with an ohm meter for the proper output. The output readings are on the supply. If you have two power supplies, and you know one works with the machine, try that supply on the docking station. If the power supply checks good, then I'm afraid the pm chip on the motherboard has gone out. You will need to take this in to have it professionally diagnosed, because it could be a replaceable component that works in conjunction with the pm chip. However, if it is the pm chip, then the motherboard will have to be replaced in order to fix it.

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