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How to open and replace dc power jack - HP Computers & Internet

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Posted on Sep 13, 2008

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Starts to power up then dies and blue light flashes every 10 seconds


The Asus Eee PC Top ET1602C All-On-One Desktop PC, is set up like a laptop.
All the hardware components are in the main unit.

This includes the Power Board. (Power circuit on the motherboard)
Part of the power circuit is the external AC adapter that you plug in.

Test the output voltage of the AC adapter.
Use a multimeter.
[An inexpensive multimeter can be purchased for as little as $5 to $12. Available in a multitude of stores. An auto parts store is but one example. Some chain stores have them in their checkout aisle racks]

AC adapter plugged into power, not plugged into all-in-one.
The center hole of the plug is the Positive connection.
The cylindrical metal outside shell is the Negative connection.

Function knob to DC Voltage.
[If just a symbol, it is a dotted line over a solid line. Fairly expensive multimeters have an auto detect feature, that senses if it is AC or DC]

Positive (Red) probe lead of multimeter goes to center hole.
Negative (Black) probe lead to outside cylindrical metal shell.
You should read 19 Volts DC.

Also while testing have an assistant gently wiggle the cable from AC adapter to all-in-one, and the power cable to AC adapter.
Fluctuation of reading indicates broken wire/s in that cable, or power cord.
Replace AC adapter if voltage low, or cord/cable damage.
One example from a quick search,

http://www.ebay.com/itm/AC-Adapter-Charger-For-Asus-EeeTop-PC-ET1602C-ET1601-Notebook-Power-Supply-Cord-/390467777452?pt=Laptop_Adapters_Chargers&hash=item5ae9b173ac

AC adapter checks out OK?

The port on the all-in-one that the AC adapter plugs into, is a DC Power Jack.
Suggest use the eraser on a No.2 pencil, and gently see if you can move the center pin around.
If so see if the center pin itself moves, or it seems the entire DC Power Jack moves.

Center pin moves indicates replacement of DC Power Jack.
Entire DC Power Jack moves, MAY just indicate the solder connections for the DC Power Jack to motherboard; may just need to be re-soldered.

DC Power Jack external inspection reveals it is OK?

On the motherboard are electronic components, that deal with the input DC Voltage.
Power MOSFETs, and Ceramic Capacitors to be more specific.

Using an ESD wrist strap, and having it connected to a good ground source, (Average price $3 to $6), the all-in-one is opened up, and electronic components are visually inspected.
Inspected to see if they are blackened, burned, or blistered.

Components are replaced if damaged.
If this is not in your line of expertise, then suggestion is to replace motherboard.

http://www.ebay.com/itm/Asus-27-ET2700-04-ET2700I-All-In-One-Computer-Mother-Board-/130769666691?pt=Desktop_PCs&hash=item1e727ac283

No not your motherboard. Just posted to give you a 'feel' what prices may be like.

Opening Case of All-In-One;
I do not have access to a direct Service Manual, nor have I worked on this model.
Very FEW all-in-one computer manufacturers EVEN post, any such information, and speaking of all; all-in-one computer manufacturers.

The usual route is to remove the Back Stand, then the Back Cover Enclosure.

Look for Philips head screws hidden under paper labels, or thin plastic covers; plus any visible screws when going to remove the Back Stand.
May also be a clip you depress after removing screws.

The Back Cover Enclosure is held on by Philips screws which surround it's outside perimeter.

(Suggest lay the LCD screen side down on a soft cloth, on a table to protect it; and be in the correct position for this procedure )

The Back Cover Enclosure also has Latches around the inside, of it's outside perimeter. These snap into Tabs located on the Front Cover Assembly.

Sometimes it's a lot of fun(?) trying to release these Latches.
A flat tipped screwdriver is used, with EXTREME caution.
The tip is ONLY inserted just so far, and the prying action is used with finesse.

[BETTER tool to use is a Spudger Tool,

http://www.ifixit.com/Tools/Spudger/IF145-002 ]

If the screwdriver does not insert at the point you are trying, it may be because you are at one of the Latches. Move over.

Finesse is used, because the Latches are now brittle from over time, and constant heat from inside the computer.
Even if you use great finesse, do not be surprised if a few of them get broken.
Tech or not, brittle plastic breaks.

It will be OK as the Philips head screws will 'keep everybody together'.

Guides using HP/Compaq All-In-Ones as examples. Glean from them in opening yours, (Ones that are listed as All-in-ones),

http://www.hp.com/hpinfo/globalcitizenship/environment/productdata/disassemblydesktop-pc.html



Note that everything comes off in 'layers'. Metal static shields, optical drive, harddrive, etc.

To replace the LCD screen for example, you have to completely disassemble from the back to the front, then you can access the screws which hold the Display Screen Bezel in place. The Screen Bezel is removed, THEN the LCD screen can be removed from the front.

[Watch me be mistaken with this model, and there IS a way to access the LCD screen from the front, lol! ]

Here are basic examples of components on the motherboard, that you may find to be bad,

https://docs.google.com/viewer?a=v&q=cache:oER5NNz8cwcJ:www.fairchildsemi.com/ds/FD/FDS6675BZ.pdf+Fairchild+FDS6675BZ&hl=en&pid=bl&srcid=ADGEEShOhWPjm_M-ROHme4iEMrztCTOd-28jNiy1hVLQQh_VOyv8zcXEVDB_iTQA6MuZO88UmRkDgjyW9j4CP2aIJ-4DS-h6JNM3lvxldeApQeecmz_DADCw1s7tmNLxfPknqX14SZP6&sig=AHIEtbS_rYUAeo_8rB9YHkW05ZjLqeH4Jg

Average cost of a Fairchild Semiconductor - FDS6679 - Power MOSFET,

http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679

One dollar, and one penny, USD.

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrkrZ1z0vhw8

Average price 63 cents to 80 cents USD.

Regards,
joecoolvette

Oct 12, 2012 | ASUS Eee Top ET1602C (ETP1602CBKX0163) 156...

1 Answer

Laptop wont come on


1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced.
2. Make sure the power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work.
5. The power button could be bad.
6. The motherboard could be defective & needs to be replaced

Sep 19, 2010 | Computers & Internet

9 Answers

Dead Toshiba A100 laptop computer


In order to replace the power jack in your laptop you’ll have to remove the jack from the motherboard as I explained in the previous post: Replacing DC power jack.
While removing the jack you can accidentally pull out the internal copper coating (I’ll call it a sleeve) from the inside of the “+” terminal as it shown on the picture below.
9807c6d.jpg
The internal copper sleeve has been removed and cannot be installed back. If you solder the power jack back on the motherboard without this sleeve it might work but the connection between the “+” lead and motherboard will not be reliable.
In the following guide I explain how to fortify a damaged power jack connection. You can use this repair technique in some laptops with similar power jacks.
Laptop is dead. How to troubleshoot the problem.In this post I’ll explain how to troubleshoot a dead laptop and find the problem. The following troubleshooting tips are not model and brand specific, they should work for most laptops.
Let’s take a look at two different scenarios.
Example 1. The laptop is absolutely dead. 
When you plug in the power adapter and press on the power button, there is no signs of life at all. The laptop will not make usual noises, LEDs will not light up, the fan will not spin, the screen is blank and black, etc… In short, the laptop is dead.
What you can do in this case?
1. Make sure the wall outlet is working and the laptop DC adapter is getting power from the outlet. Try another wall outlet.
2. Test the laptop DC power adapter, make sure the voltage output is correct. You can test the DC power adapter with a voltmeter.
3. Let’s say the DC adapter is fine and the adapter outputs correct voltage. In this case unplug the power adapter from the laptop, remove the battery, wait for 1-2 minutes, plug in the adapter and try turning on the laptop again.
OK, you tested the adapter and it’s bad. If you decide to replace the original DC adapter with a generic one, you’ll have to follow this rule:
The voltage output on your new adapter has to be exactly the same as on the original adapter. The amperage on the new adapter could be the same or higher.
If nothing helps and the laptop is still dead, apparently the motherboard is fried or there is a problem with the DC power jack. It’s possible the DC power jack is broken and the motherboard is not getting any power from the adapter. In this case you’ll have to disassemble the laptop and replace the power jack. Check out thisguide for fixing laptop power jack.

Jan 12, 2009 | Computers & Internet

2 Answers

Broken DC jacks on laptop


Here is a guide on how to fix the DC jack:
http://www.laptoprepair101.com/laptop/2007/12/06/dc-power-jack-repair-guide/


You may have to copy and paste the link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Nov 01, 2008 | Computers & Internet

1 Answer

Hp pavilion dv6000 not charging when pluged in


Hi,

Common causes of similar problems are a loose connection or a cold solder on the DC jack at the end of the laptop. In some instances, it could be the actual charger/AC adapter that may be at fault. This however could be verified with the use of a voltmeter measuring the DC voltage at the output plug. As to the DC jack, it would be more of a concern opening the laptop and exposing the underneath of the motherboard (where the solder are) rather than the actual repair which is soldering. Incidentally, there are cases where the terminals/pins of the DC jack might have been cut off hence a replacement may be required. Perhaps your best bet would be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 05, 2008 | Computers & Internet

2 Answers

My HP Pavillion entertainment PC laptop does not turn on. the charging light comes on when connected to electric outlet, but when I turn on power button, the top buttons light up for 1 sec then everything...


Hi cgafinest,

I had a similiar issue some months ago. I replaced the power supply and fixed the problem. You may want to try that first.

Hope this helps and good luck.

Aug 02, 2008 | Computers & Internet

2 Answers

Acer 9100 dc jack broken


search ebay for a DC Jack for your model. Disassemble your laptop. Desolder the broken DC Jack from the laptop motherboard. Solder the new DC jack onto the motherboard and reassemble laptop. If your not experienced in soldering of disassembling laptops I would recommend you hire someone to do this job. If you wish contact me jason@jrdtech.net

May 13, 2008 | Computers & Internet

1 Answer

Acer DC Power Jack


well..actually, it's installed on the motherboard..you'd need to strip the whole unit open, and then figure out how to desolder it from both top and bottom layers of the board..loads of potential issues arise on that.

Mar 23, 2008 | Computers & Internet

2 Answers

Asus notebook


Get a new power supply which works properly

Mar 18, 2008 | Computers & Internet

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