Question about HP Compaq Presario CQ50-103NR Notebook PC

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  • jwclark Nov 08, 2010




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There should be no heating in there. I'm afraid your motherboard is shorted.This is an older model, finding a new mobo will be difficult and expensive.

Posted on Nov 08, 2010

  • Azrael SRL Nov 08, 2010

    Connector 1 is used to power the voltage regulators for the processor ant it gets hot only when one of them is faulty. That's all i know - when damage is detected the board is scrapped in our shop.



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Power jack fix

The above is for an example, not advertising.
Enlarge the photo. Shows the Front and Rear view also.

The Center Pin is the Positive connection. The Center Pin has one prong lead going to it.
The cylindrical metal shell, inside the jack; is the Negative connection. As you can see there are two prong leads going to it.

Lastly there are two prongs that stick up also; but only go to the U-shaped metal bracket, that adds stability to the jack.
All prongs of course go down into the motherboard, and are soldered in place. The jack is shown upside down.

You need to wear an ESD wrist strap, and have it's alligator clip attached to a good ground source.
Your body carries Static Electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.

With an ESD wrist strap, the threat of Static shock to the components is removed.
(And having it's alligator clip attached to a good ground source)

Motherboard removed, the motherboard is turned Bottom side up; so you can access the solder joints, to each one of the DC Power Jack's prongs.

I cut a 6 inch piece of Desoldering Braid, (Solder Wick), and lay 1/2 inch of the tip; across one of the solder joints.
Lay your 25 watt (Or so) soldering iron on top of the braid, JUST until the solder melts.
(No.2 chisel tip for the iron)

All you are trying to do at this point, is try to remove as much of the solder as you can.
The solder wick, (Desoldering Braid), will su-ck the solder up.
Usually the first try gets rid of a lot. You will be leaving behind a thin coat of solder.

What you DON'T want to do is burn the motherboard. Go slow. Takes all day, it takes all day.

If you overheat the motherboard in that solder joint hole's area, you risk lifting a circuit trace up off the motherboard.

[Circuit Trace. Also known as Signal Trace. Think very thin flat copper wires, going all over the motherboard ]

You can also burn the circuit trace hole, (Solder joint hole), and then it won't accept tinning.
(To Tin with solder, is to leave a light coat of solder. A soldering iron, or gun's tip; is Tinned before it is ready to use)

Solder wick tip part that you are using get's 'full', then cut it off so you have a new tip to work with.
Go around, and remove the excess solder, from all those DC Power Jack solder joints.

Removed the excess solder from one DC Power Jack prong?
Allow the motherboard to cool a bit, before going on to the next one.

All excess solder removed from each DC Power Jack's prong, there should just be a light, to slightly heavier; coat of solder left behind.

With the motherboard cool enough to touch, use your fingers to put prying pressure on the jack.
The balls of your fingers grip the jack, and your fingernails work as fulcrums. Gives leverage for your fingers.

Solder iron tip cleaned (Wipe across damp sponge), touch each solder skin joint left behind. You will see you can pry on one side; more than the other; and 1 or 2 prongs should start coming up out of the motherboard.

You can only go so far with them, because the other prongs are still holding the jack.
Allow to cool down some if needed, then go to the other prongs, and heat their solder skin joints.

Keep going back, and forth; or around, and around; until finally all prongs are free from the motherboard, and the jack is removed.

If there is a skin coat of solder left over the circuit trace holes -
If you try to pick it open, or drill it out with an X-Acto knife blade; you RISK ruining the motherboard.

When you go to install the new power jack, the prongs will be resting up against those holes; and you just touch the solder skin joints one at a time, until the prongs poke through.
See how easy that is? lol!

BEFORE installing the new jack you need to THOROUGHLY clean the solder joint areas. The circuit trace holes, and surrounding area.
I use an old toothbrush, and Isopropyl Alcohol. (Rubbing alcohol)
91 percent is best, but 70 percent will do.
50 percent = no IMHO, because it is 50 percent WATER, and 50 percent Alcohol.

Isopropyl alcohol is EXTREMELY FLAMMABLE!
Use in a WELL ventilated area with NO sparks or flames present.

After cleaning you may find that solder was lifted off, and the circuit trace hole needs to be re-tinned again.
Do so if needed.
DC Power Jack in place, I suggest a LITTLE dab of Rosin paste flux; on each prong to be soldered. (Use a flux paste brush is best)

Helps make that solder stick, and you can make a pretty solder joint. (Should resemble a 'Hershey's Kiss', and be bright, and shiny)

Just examples, not advertising;




More info that may help;

Service Manual (Free),

Go to - Gateway 400. (400 in blue) Scroll across, click on -

(It's a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name (450ROG), it may take up to 30 seconds, before the first page comes up )

For additional questions please post in a Comment.

Jan 05, 2013 | Gateway 450 Rog, Xp Pro, 512ram, Intel...

2 Answers

Hey, I have a samsung R60 Plus laptop for a few years now, and its out of warrently and the DC jack power socket has just stopped working. I ordered in a new DC jack for the power socket and soldered out...

When the short happened it caused a feedback in the power supply charger, I would sub out the power supply with a replacement as a first important step to see if the laptop will come back online.

May 21, 2012 | Samsung Computers & Internet

1 Answer

I have Acer Laptop with a JV50PU motherboard which has a faulty DC input socket connection. The laptop works OK on Charged battery but not on DC input. Is it possible to get a schematic of the motherb

If the DC Power Jack is soldered onto the motherboard then take the time to unsolder it and remove it. Then buy another DC Power Jack which costs less than $8.00 and solder it into it's place. Normally when it is soldered onto the motherboard there is no cable involved. That's all there is to it if it's soldered onto the motherboard.

If it sits on a slot in the motherboard and has a cable harness attached to it then you can purchase that too for less than $15.00. All you do then is follow where the other end of the cable harness plugs into the motherboard and unplug it. Then place the new dc jack in the slot where the old one sat and plug the other end of the cable harness into the motherboard.

Mar 20, 2012 | Computers & Internet

1 Answer

Hp dv4 power supply diagram

Power Supply is the AC adapter (Charger), the DC Power Jack harness it plugs into in the laptop, and a power sensor chipset, or chipsets, on the motherboard.

[ Chip and Chipset are slang terms for I.C.
Integrated Circuit, ]

As for a diagram of how the Power circuit runs on the motherboard, it isn't available to the general public. It is part of HP's, and/or the motherboard manufacturer's, design patent.

All I can state, is that you may want to check out the continuity, of the DC Power Jack harness. (Ohms check of each individual wire)
See if it is good. Also make sure it it plugged in tightly to the motherboard.

Past this point it's check out the motherboard with a dual trace oscilloscope. Trace the power circuit down to see where the problem is.

Bad power sensor chipset? Usual repair is to just replace the motherboard. Cost, and obtain ability of procuring the chipset, plus technique, and tools involved, justifies replacing the motherboard, and not trying to replace just the chipset.

The chipset is mounted to the motherboard via a BGA Surface mount.

BGA Surface mount:
Compare to an older Intel Pentium 4 processor, that uses a Socket 478 processor socket.
The bottom of the Processor chipset has contact pins. 478 of them.
The processor socket has matching socket holes. 478 of them.

With a BGA Surface mount, there are no contact pins, nor matching socket holes.
Solder Balls take the place of the contact pins on the chipset.
Copper Pads take the place of the socket holes on the motherboard.

The chipset is set into place over the motherboard, with the Solder Balls lining up on the Copper Pads.
The chipset is set down into place, and heat is applied.

Heat is applied at a specific temperature, and for a specific amount of time. The solder balls melt, which solders the chipset to the copper pads. (Which in turn solders the chipset to the motherboard)

To replace, a BGA Rework Machine should be used. Not something everyone has laying around. Read - Expensive.
Therefore repair is expensive.

Justifies motherboard replacement.

HP Pavilion and blue - dv4

For additional questions please post in a Comment.
I would like to know what specific problem you are having, also.


Jan 04, 2012 | HP Computers & Internet

3 Answers

Where the charger plugs into the laptop the pin broke off from the laptop can I replace just that piece

the power on a Dell laptop is an integral part of the Motherboard so I am afraid it needs the whole motherboard replacing.

Dec 19, 2010 | Dell (8N816) Motherboard

2 Answers

How do I check for faulty DC socket (power jack) in my asus eee pc

1) Start out by removing all power to the laptop.
Of course you probably have the AC adapter (Charger) removed, but also remove the Battery.

See if you can gently wiggle the Center Post.
Also look to see if it seems that the entire DC Power Jack is moving around.

You may have to scrutinize pretty close to see any perceptible movement.
There should be No perceptible movement at all.

This is an example of a DC Power Jack for an Asus Eee 1005HAB Notebook PC.
It may, or may not, be The DC Power Jack you will need, but is used here for an example of the DC Power Jack construction,

You can click on any of the three views shown, and have all three views enlarged.
Click to enlarge.

Looking at the view on the far left, the Front view. You will see what appear as three pins sticking up.
These are Prongs.
Shown again in the Back view, which is the middle example.

These two views show the DC Power Jack upside down, in relation to how it sits on the motherboard.
The Prongs go down through holes in copper circuit traces on the top of the motherboard, and are soldered to the motherboard on the bottom side.

A) From accidentally bumping the AC adapter's plug while inserted into the DC Power Jack, the solder joints may have cracked. This can also happen with just normal usage from plugging, and unplugging the AC adapter.

Solution for this is to re-solder the cracked solder joints.
Sounds easy, but in reality the entire laptop has to be disassembled down to the bare motherboard in your hand. No Processor on the motherboard, no Ram Memory, no nada, but the bare motherboard.

Soldering can ruin a Processor, Ram Memory, or associated hardware components still installed on the motherboard.

B) The DC Power Jack may be broken. The Black body of the DC Power Jack that you see in the examples, is made of plastic.
This entails de-soldering the Prongs of the DC Power Jack, removing it, properly cleaning the area, (area around the copper circuit trace holes in the motherboard), re-tinning the area around the circuit trace holes, then installing the new DC Power Jack, and soldering it into place.

This is a basic example of DC Power Jack replacement,

C) The motherboard area that the DC Power Jack is soldered to, can be compared to a 'Peninsula'.
A small strip of motherboard that sticks out away from the main body of the motherboard.
This 'peninsula' can crack at the area where it meets the motherboard.
This will result in stretched broken circuit traces.

[Think of a circuit trace as being a very flat, thin, copper wire ]

If this has occurred toss the motherboard.

[ In regards to the DC Power Jack repair guide in the link above;

1. You don't need a soldering station. A soldering iron around 40 to 50 Watts with a No.2 chisel tip, and well tinned, will work just fine. Have a very damp sponge nearby to constantly clean the tip with.

2. I advise using Desoldering Braid instead of a Desoldering Tool. The braid is laid on the solder joint to be removed. The tip of the soldering iron is laid right on the braid, above the solder to be removed. The copper braid will 'soak up' the solder.
A lot handier than a Desoldering Tool IMHO.

3. Isopropyl Alcohol is EXTREMELY FLAMMABLE! Do not use near the soldering iron, and use in a WELL ventilated area with NO sparks or flames present!

4. If you are rusty with your soldering/de-soldering techniques, practice awhile before attempting this procedure.

Do Not overheat the copper circuit trace area around the holes. This will burn the area, and it won't accept tinning. (Tinning: Applying a light coat of solder) If it will not accept tinning, toss the motherboard at the cat. It's junk.

Overheating can also lift the copper circuit trace right off of the motherboard.
Make SURE you make a pretty, clean, solder joint. A cold solder joint will result in you starting all over.
It's a pain in the keister to disassemble the laptop in order to repair a cold solder joint.

Make sure the soldering iron tip is clean, and well tinned before you start.
Clean the tip often by wiping it across the damp sponge ]

The center pin of your DC Power Jack may be 1.0mm in diameter, or it may be 1.65mm
Make sure you obtain THE correct DC Power Jack.
The one's that are advertised around $2 to $5 may be junk, and no where near the actual DC Power Jack you need.

This place may be the one to go to. Don't know, haven't tried them, and not advertising for them.
I do like how they want you to send a photo in, and they also ask questions BEFORE you purchase.
IMHO it seems as though they may be professionals in their area of expertise,

If you wish to have a Service Manual I do not see any online links to give you, except for one that details how to disassemble down to the Harddrive.
From there it would be a guide to an Asus Eee PC that is fairly close IMHO.
Plus guidance from me.

Have questions mtrunner53 please post in a Comment.


Dec 13, 2010 | ASUS Eee PC 1005HA-PU1X-BK Netbook

1 Answer

Have a dell insprion 9300 Will not charge the battery I have two of these laptops ones the e1705 and the 9300 batterys are the same as watts does the same thing with both batterys it will run on battery...

The jack on the laptop that you plug the AC adapter (Charger) into, is called a DC Power Jack.

I would like you to click on the photos of the jack. (3 views shown. Has on it)

The middle photo, and the photo to the right, shows copper prongs that protrude out of the jack.

The view to the right shows the jack upside down, in relation to how it's mounted on the motherboard.
The prongs go through the motherboard, and are soldered to circuit traces on the motherboard.
(For simplification, think of circuit traces as being very thin flat copper wires on the motherboard)

There is data stating that the solder joints have a tendency to crack, even with normal usage of just plugging, and unplugging the AC adapter.
It is also stated that the motherboard area where the DC Power Jack is mounted, is of a bad design.
Many have had the motherboard replaced, ($400 to $500), only to have the same problem come up later.

It has also been stated that the manufacturer states replacing the AC adapter, but has been shown to no avail in solving the problem.
Same thing comes up for the Dell Inspiron e1705.
(I know, I'm just a 'Ray of Sunshine')

A cracked solder joint, or cracked solder joints make an intermittent contact. When the DC Power Jack is in a certain position with the AC adapter plugged in, the contact may be good. Moved around by plugging in the AC adapter again, the position may change, and result in an intermittent contact, or no contact at all.

Laptop will not power off of the AC adapter, nor will the AC adapter charge the battery.
This is the reason why the laptop will run straight off of the battery, but the battery isn't being charged back up.

It could also be that the damage is further than a cracked solder joint, or cracked solder joints.
One of the prongs could have come loose from it's mounting, and no longer be attached to the pin it's supposed to be attached to.

[ The AC adapter converts AC {Alternating Current} electricity from your household, or business, into DC electricity.
{Direct Current. Batteries are an example of stored DC electricity}

DC uses two connections. A Positive connection, and a Negative connection.
One of the prongs is for the Positive connection, another one is for the Negative connection. The other prongs are used for stability, to mount the DC Power Jack in place to the motherboard. Generally the center pin/s are for a Positive connection, the outer pin/s are for the Negative connection ]

Unless I had the laptop in my hand, I can only give you a generalization of what may be wrong, and the possible solution to repair it.

1) All power to the laptop removed, (AC adapter and Battery), see if you can wiggle the DC Power Jack around. Any perceptible movement is bad.

2) Past this point the laptop will have to be completely disassembled, down to the bare motherboard in your hand. Requires visual inspection of the solder joints for the DC Power Jack, and the surrounding circuit traces.

It may be something as simple as resoldering a cracked solder joint. (Or joints)
It may go further into replacing the DC Power Jack.
It may still go further if the area on the motherboard where the DC Power Jack is mounted, has cracked.

You or a tech may not be able to mount a new DC Power Jack.
This would require a workaround, IF feasible. Won't be aesthetically appealing, however.

Dell Support > Inspiron 9300 Notebook PC > Service Manual,

Older Dell Inspiron 1300 laptop, but linked to show you more about replacing a DC Power Jack, and the required 'little things'. Such as properly cleaning the solder joint area on the circuit trace, that a prong for the DC Power jack, goes through, and is soldered to.

You may find this useful also,

Click on - Dell 5150/1100 series Slideshow
(Author Charles House)

1) Buy an wear an ESD wrist strap. (Electro Static Discharge) The average cost is around $3 to $8.
Connect the alligator clip to a good ground source. I connect to the metal frame of an empty desktop computer case.
Observe Anti-Static Precautions.

[Your body carries static electricity. Static will fry out (Short Circuit) the hardware components inside a computer. Wear the ESD wrist strap, and connect it to a good ground when working on the laptop.
Should you leave in the middle of working on your laptop, upon your return be SURE to put the ESD wrist strap back on ]

2) There may be as many as 60 screws, and 12 different types of screws. Do Not mix them up.
Use a multi-compartment container for the screws. Mark each compartment for the area the screws came out of. Do not stack them neatly on a table. Recipe for disaster.
You can use a clean egg container in a pinch. Mark each egg holder.

3) Use Solder Wick, (Desoldering Braid) to remove the old solder. Do not use a Desoldering Tool.

4) Make sure the area of the circuit trace that you have removed solder from is CLEAN. The links above will detail more about this. Make sure the circuit trace areas are pre-tinned with solder, before inserting the DC Power Jack's prongs. Don't worry if the hole in the circuit trace is covered with solder from tinning.
You can heat it up to insert the prong. (One prong at a time)

5) DO NOT linger too long with the soldering iron, (40 to 50 Watt) This can render a circuit trace useless.
It will burn it, (And the motherboard), and render the circuit trace useless from accepting the tinning.
(Solder it applied to the area to be soldered in a light coat. = Tinning)
Linger too long, and you can lift the circuit trace right off of the motherboard.

For further questions please state in a Comment.

Oct 27, 2010 | Dell Inspiron 9300 Notebook

2 Answers

Dell Inspiron B130 - can you replace the connection for the power source/battery charger? Mine is shorting out and not always charging the battery (new battery, new AC cord and adaptor).

Yes you can replace the power adaptor. You may also remove the solder from the existing adapter and re-solder it back on which is what I did. If you just want to replace it I suggest Ebay before I repaired mine I ordered a new one for $5 w/ free shipping.

Dec 29, 2009 | Dell Inspiron B130 Notebook

3 Answers

How to replace a powerjack

This is a difficult task, that only the most proficient tech should try to take on.
There are very fewer, and fewer techs that do this.
Because it is easier, and sometimes wiser, to just replace the motherboard.
[Also generates more money for a repair shop $$$$. There ARE instances when it is necessary to replace the motherboard though, instead of just the DC Power Jack. Read on]

That said, read the following, and see if this task is within what you want to take on.

1.Basic static precautions should be observed. The tech must wear an ESD wrist device to help prevent static electricity shock, to the delicate computer hardware components. Your body carries static, and body movements can generate Static.
Static can silently fry out delicate computer hardware components, and 9 times out of 10, you won't see it or feel it.

[A cheap ESD wrist device can be purchased for around $6 to $8]
The Electro Static Discharge wrist device has a cord attached to it, with an alligator clip on the end of the cord. The alligator clip is attached to a good ground source. (I use an empty desktop computer case, and attach the clip to the metal frame)

You should work on a tabletop, and wood, or fake wood is preferred. DO NOT work on a bed, couch, or directly on a carpet floor. These are high areas of Static electricity!

2.AC adapter, (Charger), and battery removed, the entire laptop has to disassembled, down to the bare motherboard in your hand. No processor, Cooling Tube and heatsink, ram memory, wireless adapter card, harddrive, optical drive, Nada. [The LCD screen is removed from the main body, and is not disassembled any further]

3.After THE correct DC Power Jack is located and purchased, then it's time to use the proper tools for removing the DC Power Jack. It's best to use a Soldering Station, but if you are proficient at de-soldering, and soldering precise electronic components, you can use a pencil tip 40 Watt iron. I recommend using Desoldering Braid, instead of using a Desoldering tool. Much easier, and a better tool.

I don't know your electronic repair expertise, but be aware that lingering too long when melting solder to remove it with the solder wick, (Desoldering Braid), can result in burning the motherboard, rendering it useless. Not enough heat when soldering, can result in a 'Cold Solder Joint'.

I pull up on the DC Power Jack to be removed with my fingers, as I'm melting the solder joint for one lead. Use finesse with the amount of force you apply, as you can apply too much force, and pull up a circuit trace right off of the motherboard! As the solder joint melts for that lead, only pull it up so far. Now go to another lead, melt the solder, and pull it out so far. Keep going around the leads until lead, by lead, comes out of the motherboard, and the DC Power Jack is in your hand.

I clean the DC Power Jack area on the motherboard with Isopropyl alcohol. Isopropyl alcohol is VERY FLAMMABLE, and should be used with Extreme caution! Keep the soldering iron far away from it, use in a Well ventilated area.
You want those mounting holes very clean, for the Rosin core solder to stick to it. I make sure the small area around each mounting hole, is tinned well with fresh solder. Gives a good area for solder to stick to, after the new DC Power Jack is installed. After the new DC Power Jack is installed, you may have to clip the leads that stick out, IF, they protrude too far. I haven't found any yet, but there is always the first time.

4.Now reassemble the hardware components back onto the motherboard, and reassemble the laptop.

If you have made a mistake anywhere along the way, you now have an expensive doorstop.

Some laptop motherboards have an area that the DC Power Jack mounts to, that resembles a Peninsula. (Like an island attached to the main body of land)

This Peninsula can break away from the main body of the motherboard. When it does, the circuit traces on the motherboard stretch, then break. (Circuit Trace. Think - Very, Flat, Thin copper wires)

Replacing the motherboard is the best option in this case.

Sep 10, 2009 | Gateway 7330GZ Notebook

1 Answer

Amilo Pro v2065 shuts down when battery is plugged

you need do check:
1) no charging means adapter input problem, first check your adapter DC output voltage is ok
2) check DC jack socket on the motherboard:
--- DC socket any pin disconnected, you need use iron and flux to fix it
--- DC socket damage(broken),you have to change it
3) if DC socket connection normall, the DC/DC circiute near around DC socket some component damage, you need find a technacian to repair.
hope help you to deal it well

May 14, 2009 | Fujitsu Siemens AMILO Pro V1000 Notebook

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