Question about Tatung (TWNB12N01) PC Notebook

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No power I recently used my laptop with no problems. Aftern being stored for several week, when I plugged in the ac adapter, no lights or no signs of power going to the computer. Any ideas? thanks. Dee in Texas

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  • Daniel Bass
    Daniel Bass May 11, 2010

    Have you tried running it off of the battery?

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Check the power pin. . . .Pretty common problems for these to get broken.

Posted on Mar 04, 2008

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Hi,
Plug it in For 8 Hours, To charge the Main Battery.
After 1-2 hours ( feel if the A/C Power Pack ) Is getting Warm.
If this does,nt work, check the fuse in the Plug.
Certain Laptops Will not Power On, if the Battery ( In The Laptop ) is dead Or Faulty.
Mike @ Compurepair.

Posted on Feb 26, 2008

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Hi,
Better to connect another AC adapter and check it.If ur laptop have Warranty then please take it from nearest Service centre.

Thanks,

Posted on Feb 26, 2008

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Hello,

There are three possible parts in your computer which causing this problem.

1. Defective Ac Adapter
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3. Defective Motherboard

What you need to do is to is isolate the part which causing the problem. Here's what you need to do.

Remove the battery and use the ac adapter only to power up your computer. Make sure to check that you can see any sign of power in the laptop like lights or anything like that. If the ac adapter does not power up the computer, then you need to replace the ac adapter or check the port for any signs of damages.

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Hp pavilion dv5-1002nr will not power up


Let's run through a basic flow chart.

1.Plug the AC adapter, (Charger), into the laptop.

Is the Power LED light on, and the Battery charging light?

[The Power LED light is on the front edge of your laptop, all the way to the left.

There are three small rectangular LED lights in this area.
1) All the way to the Left - Power LED light.
2) In the middle - Battery Charging LED light.
3) On the right - Harddrive Activity Lamp {Light}
The HDD Activity lamp blinks when harddrive is in use]

Gently wiggle the AC adapter plug, that is plugged into your laptop.

Does the Power LED light and/or Battery Charging light, 'Wink' when you move the plug? (Blink)

Does it stay on when you keep it over to a certain position?

If so, you have either a bad plug on the end of that AC adapter cable, wires that are bad in the cable itself, or a bad DC Power Jack.

(The DC Power Jack, is the port where you plug the AC adapter in. May be labeled as DC IN)

Do you wish to test the AC adapter plug?
See if it has an intermittent connection, due to a break in the wires that meet the plug?

And/or, see if the AC adapter is putting out any voltage, and if so, the correct amount of voltage?

Do you have a multimeter?

A cheap, yet effective multimeter, can be purchased for around $10 to $12 at most auto parts stores. (Radio Shack has them, and a multitude of other stores also. Not an advertisement for Radio Shack)

Set the multimeter to DC Volts, (Turn the knob in the front), and if it has a separate setting, set it to DC Volts - 50 Volt scale.

Read the label on the AC adapter's case. You are looking for the OUTPUT voltage/amperage.

Example:
I'm looking at an Acer Aspire laptop's, AC adapter right now.

INPUT: 100 - 240V ~ 1.8A - 50/60Hz
OUTPUT: 19V === 3.42A

The Output voltage is 19 Volts.

AC adapter plugged into the surge protector.
The Red lead, (Positive), of the multimeter, (Right now it's being used as a Voltmeter), is inserted into the middle of the AC adapter plug.

The center of the plug is the Positive connection.

The Black lead, (Negative), is held against the outside of the AC adapter plug. The round cylinder of the plug on the outside.

This illustrates the AC adapter,

http://www.buy.com/retail/product.asp?sku=213337465&listingid=63465880

The photo shows the AC adapter charger body, attached to the cable with the plug.
To the top left you see the plug, and the shiny metal cylinder. The Black lead touches the outside of the cylinder.

Read whether you are getting voltage, and the proper amount of voltage.
Gently wiggle the plug back, and forth, and see if there is a break.
Voltage, no voltage.

If the AC adapter proves to be good, you have a problem with the DC Power Jack. (DC IN)

The DC Power Jack is on the right side, all the way to the rear.

The setup, and mounting for this DC Power Jack differs from most laptops.
Most laptops have the DC Power Jack soldered directly to the motherboard, or are soldered to a separate small circuit board, that plugs into the motherboard.

This jack has a cable leading from it, and the jack attaches to the bottom case of the laptop, via a small bracket.

To illustrate what I'm referring to here, you may want to download, (Free), the Maintenance and Service Guide from HP Support.

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&product=3753576&lang=en&

(Just click on the X, of the small survey window that comes up)

On this page Left-click on -
HP Pavilion dv5 Entertainment PC - Maintenance and Service Guide
(10th file down. This is a PDF file. The computer you are on now has Adobe Reader on it, which uses PDF files)

Give it a few seconds to download. It may take up to 20 seconds before you see the first page.
I advise wait, until it has fully downloaded before looking through it, or you may break the download connection.

Under the Bookmarks column to the left, click on the + sign next to - Removal and replacement procedures

Click on the + sign next to - Component replacement procedures

Scroll down, and click right on - Power connector cable

(Or use the blue down arrow above to go to Page 96)

Point of this?
If you are technically inclined, you could disassemble the laptop, and replace the Power connector cable.
The DC Power Jack is part of the Power connector cable.

[BUY and USE an ESD wrist s-trap. Connect the alligator clip to a good ground source. I use an empty desktop computer case, and connect to the metal frame.

Average cost is around $6 for this device. Can be found in a multitude of stores. Again, Radio Shack is one source, but there are many.

Use a multi-compartment container for the various screws you will remove. Label each compartment for the area the screws came out of.
You can use a clean egg carton in a pinch.

Make notes, and drawings as you disassemble. Use a digital camera if you have one available.

Check with HP to see if this part is available. I also would check online, and you may want to give thought to Ebay]

2. If the Power light stays on with no intermittent problems with the DC Power Jack, or the AC adapter:

A.There may be a problem with the Power On switch itself. (Under the Power On button)

B.The Ram Memory modules, (Slang is Stick), may have become jarred loose.
AC adapter unplugged, battery removed. Open the Memory Compartment, and remove all ram memory modules. Now reinstall them.

Reinstall the Battery, and then the AC adapter. (Then plug the AC adapter into the surge protector)

Power On the laptop.

C. The Harddrive might not have a good connection.
All power sources removed again, open the Harddrive, (HDD), Compartment.
Make sure the harddrive's plug is tightly connected.
(Page 62)

D.If none of the above cures the problem, then it's time to seek a professional, competent computer repair shop.

The charging circuit of the motherboard may be bad. There is a sensor that determines if power should come from the AC adapter, or the battery.
It also determines if the battery needs charging.

You may have harddrive failure.

[Again, if the shop does determine it to be a bad motherboard, AND you feel technically inclined, you may want to replace the motherboard yourself.

Check online, and also Ebay]

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1 Answer

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There are several simple indicator to determine the source of the problem. There are 4 major components involved, the laptop circuitry, contact terminal, AC adapter and battery. Every laptop has a LED light indicating if it is in the charging mode (without powering up the laptop). Start out with your laptop shutdown. Pull out the battery, then plug in the AC Adapter. See any LED light go on? Try again, the same procedure now with the battery plug in first, then plug in the AC adapter. See any additional LED lights go on? If there is no different, than the laptop can not detect your battery. If the AC adapter can power up your laptop, you can eliminate the battery (assumed brand new battery) & AC adapter. This only leaves you with the laptop circuitry & contact terminal. If your laptop can charge up your old battery or any battery, then it might be still the battery & contact. So, you try these procedure to reduce down to the "problem" component.

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plz try by resiting the ram, if the problem persist then you have problem in display adapter,send it to the vendor from whom you have bought

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If the ac adapter was plugged into the laptop at the time may be bad news. Unplug AC adapter, take out the battery and hold power button for 10 seconds. Then connect AC adapter and hit power. If that doesn't work put battery back in without ac adapter and hit power button.

If neither test works bring to repair center for diagnosis. Best case AC adapter would need replacing. Worst case Motherboard fried.

Thanks

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