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Laptop won't power up with AC adapter and won't charge battery

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  • Laptops
  • Power Up
  • Motherboards
Last response: in Laptop Tech Support
January 3, 2014 8:55:49 AM

1) the laptop doesn't power on without a battery
2) the light which would indicate that the laptop is plugged into the ac adapter is not on when the ac adapter is plugged in.
3) the battery charge light is also not on, which would indicate the battery is being charged.

The battery does not charge...
The AC adapter is fine, tested with other laptop.
The battery is also new and works fine

I took the laptop apart. Took out the DC Jack and tested it separately.

I used a crappy non digital volt meter. Set it to 50 DC V. Plugged the DC Jack into the AC adapter...

There are 2 red 2 black. Each red shows 8V exactly.

I plugged the dc jack into the motherboard with the AC adapter connected, with the motherboard out and proceeded to test the various contact points on the 4 pin connector with the dc jack plugged in. I tested contact points on both sides of the motherboard on the soldering points. Each time getting the 8V reading.

Thanks for the help

More about : laptop power adapter charge battery

a c 538 D Laptop
a b V Motherboard
January 3, 2014 9:03:35 AM

Hi, what is the make and model of your laptop, if you read 8V from the adapter, it's a bit low for the voltage, but I don't know which laptop we are talking about.
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January 3, 2014 9:23:35 AM

Hi sorry it's a Toshiba Satellite PSK1NC-03J00S - Satellite L650D - 03J
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Related resources
a c 538 D Laptop
a b V Motherboard
January 3, 2014 9:52:31 AM

If you check the voltage of the adapter by itself, you will have 19V DC, less, you have a defective adapter. But if you have 8V DC at the motherboard, then you have a short circuit on the motherboard.
m
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January 3, 2014 10:07:57 AM

well the adapter is fine because I checked it on another laptop...

sorry, I don't know what that actually means "short circuit" on the motherboard....

do I need a new motherboard?

the thing is...I was also only getting 8v on each red wire when I had just the dc jack connected to the ac adapter alone...

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a c 538 D Laptop
a b V Motherboard
January 3, 2014 10:18:40 AM

Yes, you need a new motherboard, you have a short, meaning some integrated circuit connects the power to ground.
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January 3, 2014 10:31:02 AM

Correction, I'm an i diot and don't know how to read my volt meter properly.

I'm getting 19V coming from the AC Adapter through the DJ Jack and those are also the same values when testing the connectors on the motherboard while the dj jack is plugged in.
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 10:39:42 AM

When you are not familiar with a voltmeter sometimes it's easy to make a wrong reading.
m
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January 3, 2014 10:41:09 AM

so where if anywhere do I go from here?
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 11:01:10 AM

If I have the right schematic, you should have a fuse near the DC jack or the wires from the DC jack, it's a white rectangle mark FUSE on the motherboard, check the voltage on both side from ground.
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January 3, 2014 11:12:09 AM

you mean the little tiny white rectangle shaped thing with golden metal ends and it says E8A on it or something? so I just keep the dj jack plugged in and use the volt meter, touch each end?


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a c 538 D Laptop
a b V Motherboard
January 3, 2014 11:19:45 AM

Yes that's the one, DC jack plug in, the black probe from the voltmeter to the black wire of the jack, the red probe to each side of the fuse, you should have 19V on each side.
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January 3, 2014 11:33:31 AM

ok both ends show 19V and one spark, not sure what I touched...I also accidently touched this little thing next to the fuse which emitted a spark as well...*hides in shame*
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 11:55:19 AM

Search for the PAD6205, what voltage do you have with the red probe.
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January 3, 2014 12:07:37 PM

I found the PAD6205 and if you're just referring to touching the soldering contact point that's there it shows no reading at all...I even dug the probe a little bit in because I think these motherboards have a coating on them to protect from electrical surge?
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 12:14:00 PM

The black probe is still with the black wire, check with the red the PAD6202.
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January 3, 2014 12:21:32 PM

yep black probe always on black wire on dj jack...6202 is about 3-3.5v
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 12:36:56 PM

Just to be sure I have the right schematic, what is the number on the Q6002 chip.
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January 3, 2014 12:57:34 PM

I can't say I know what I'm looking for...so far I can't locate it....do you have skype?

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a c 538 D Laptop
a b V Motherboard
January 3, 2014 1:09:24 PM

No, I don't have skype, internet is too slow for it right now. What you are searching for is a little black square chip with 8 pins, beside the chip, it's written Q6002, I need the number on the chip, just to be sure.
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January 3, 2014 1:41:26 PM

found it but there's no way I can read that...any other indicator that could work?
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 1:47:02 PM

Ok, a bigger one is the U6000 24 pins chip.
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January 3, 2014 2:43:22 PM

17453se tg(or q)d43 itbi +
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a b D Laptop
a b V Motherboard
January 3, 2014 3:03:39 PM

This board is likely shot and when a high priority chip like this fails it usually takes others with it unless there is a bad joint you are not likely to get this running. So you are left with one other option and that is to hunt down another board. I rebuild and customize laptops so I learned what to fix and what to flat out avoid. When a board goes out it is usually not worth the money fixing or replacing but bad chips can be difficult to root out.
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January 3, 2014 3:57:51 PM

the board and laptop work fine on battery so it must be a very local issue. I don't believe I can start soldering on new parts of the motherboard but I'd like to know what exactly is blown.
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 4:43:52 PM

Ok give me the voltage on the R6013 resistor, it's below 2V DC.
On one side is zero volt.
m
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January 3, 2014 5:09:12 PM

if it's a tiny little one then it gave me no readings and I have no idea what you mean by "below 2v dc"

in any case, if I got the correct resistor, it gave me no readings no matter where I touched it.
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a c 538 D Laptop
a b V Motherboard
January 3, 2014 5:36:30 PM

I said it's below 2v DC because you need to have a low scale on the voltmeter to have an accurate reading.
You have the coil L6001, what do you have on both side.
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January 3, 2014 6:23:44 PM

I had the volt meter set on 10vDC for the others....for L6001 it's about 19-20v on both sides.

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a c 538 D Laptop
a b V Motherboard
January 3, 2014 6:49:55 PM

Now the MOSFET Q6002, pins 5,6,7,8 all connected together for the drain, pins 1,2,3 all connected together for the source, and pin 4 for the gate.
What are those voltages, drain, source and gate.
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January 3, 2014 7:36:09 PM

1,2,3,4 19-20v
5,6,7,8 about 3v....the top pin (I'm assuming pin 5) on the right side if I'm looking at the Q6002 right side up doesn't have any power
the other 3 on the right side I'm assuming 6,7,8 are all about 3v

m
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January 4, 2014 3:33:45 PM

I'm just thinking, I don't understand how it's possible that the entire system works fine on battery but won't charge and won't power up on the ac adapter...
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a c 538 D Laptop
a b V Motherboard
January 4, 2014 4:16:24 PM

Hi, I'm back, it's because you have the charging circuit (MAX17435ETG) who switch between the adapter and the battery. It's some component around this chip or the chip itself who is the problem.
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January 4, 2014 8:07:51 PM

can we fix it?
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a c 538 D Laptop
a b V Motherboard
January 5, 2014 6:12:31 AM

I can do it, but you if you never solder before I don't think so. You need to have the skill in soldering to do a good job. You must have a soldering iron and a hot air soldering iron to remove the chip. The most difficult component is the chip (MAX17435ETG) if it's the problem. And you need to find the component also.
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January 5, 2014 11:34:49 AM

So based on the troubleshooting we did, you can confirm that it's that one chip? Where would I find it on the board? Maybe I can find a guy locally to do it...do you think the job would be costly?

Can I test this chip via the volt meter to confirm it's dead?
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a c 538 D Laptop
a b V Motherboard
January 5, 2014 12:45:07 PM

The voltages you gave me are not conclusive to determine for sure that U6000 is defective. To be sure, give me the voltages for the :
D6004 diode = ?
D6005 diode = ?
R6012 resistor on both side = ? and = ?
C6023 capacitor = ?
C6032 capacitor on both side = ? and = ?
all those voltages referring to ground or black wire.
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January 5, 2014 1:39:20 PM

ok ill do this later, I really need to get a magnifying glass.

thanks again.

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a c 538 D Laptop
a b V Motherboard
January 5, 2014 2:54:32 PM

Those components should be around the U6000, it's somewhere to start, and they are very small.
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January 13, 2014 7:11:36 AM

Sorry it took so long, got busy at work...

D6004 - 19v
D6005 - 19v
R6012 - can't find for the life of me, I have a 16 and a 13 but no 12
C6023 - 19v
C6032 - 3v-0v
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a c 538 D Laptop
a b V Motherboard
January 13, 2014 8:21:40 AM

To confirm that the U6000 is not defective, on the capacitor C6028 you will read zero volt on both side. The voltage should be 1.68V on one side to detect the adapter.
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January 13, 2014 9:12:48 AM

Just tested the c6028....its as you say, 1.68v on one side and 0 on the other side.

You think maybe there was a surge in the circuitry and by removing all the parts and doing this testing I may have fixed this? You remember in our initial testing I said I got some sparks? This is no longer happening, I've touched those same components again near the U6000 and there are no more sparks.
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a c 538 D Laptop
a b V Motherboard
January 13, 2014 10:49:53 AM

Ok, the adapter is detected but the MAXIM (U6000) is not giving the voltage to switch on the MOSFET Q6002. So, check the MOSFET Q6004 on the 3 pins.
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January 13, 2014 10:58:37 AM

only one of the 3 pins shows a voltage (17v) to be exact...it's the 2nd pin on the side where there are two which shows the voltage...the other two pins show no voltage reading.
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a c 538 D Laptop
a b V Motherboard
January 13, 2014 11:37:00 AM

Can you give me all the voltages on the chip U6000. Here is a picture of the pinout.

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January 13, 2014 12:28:27 PM

1 - 0v
2 - 0v
3 - 19v
4 - 5.8v
5 - 0v
6 - 0v
7 - 8v
8- 3.2v
9 - 3v
10 - 3.8v
11 - 3v
12 - 3v
13 - 3v
14 - 0v
15 - 3v
16 - 3v
17 - 0v
18 - 0v
19 - 1.5v
20 - 3.9v
21 - 4.4v
22 - 5.8v
23 - 0v
24 - 0v

again all my measurements are with a crappy non digital volt meter
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a c 538 D Laptop
a b V Motherboard
January 13, 2014 1:53:46 PM

From all the readings you did, the problem could be the charging chip U6000. I'm not certain at 100%, but one reading said that the chip is defective. I could be wrong, but this is what I conclude.
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January 13, 2014 4:10:14 PM

based on my original symptom it is the charging chip...which part of the U6000 is the culprit? Thanks for all your assistance, I enjoyed learning a bit.
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Best solution

a c 538 D Laptop
a b V Motherboard
January 13, 2014 4:42:16 PM

You have the pin 3 named DCIN, this pin is the Charger Supply Input, on this input you read 19v, the voltage from the adapter. After you have pin 19 named ACIN, it's the AC Adapter-Detect input with 1.5V, it's compared to a fixed voltage of 1.485V (typ). The two readings are good, but the comparator inside the chip gives a low signal to the ACOK who is the AC Detect Output. The pin 10 is the ACOK, it should be low when the AC adapter is present and enables the charger. But you have 3.8V on pin 10, also you have the pin 14 named PDSL, who at the presence of the adapter should give 8V above the voltage of the adapter, but you have 0V. You have some voltages from this chip who are not good to use the adapter for the main source of power.
Sorry if it's too technical.
Share
January 13, 2014 5:08:57 PM

no this is perfect, thank you.
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