Question about Compaq Presario 700 470024-192 Notebook

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How do you remove the bottom cover

I need to check the solder joint for charger

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Here is a step by step guide.

http://repair4laptop.org/disassembly_compaq.html

Posted on Feb 04, 2009

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2 Answers

Amilio laptop not charging in spite of new charger


please measure the output for your charger,normally they have 19.5 vdc exactly, if they do not measure the adapter is faulty, repair or replace.If the output is o.k the battery can be faulty. Use the software diagnostic coming with the computer, restart the computer HOLD the key f2 or esc depending of your computer model, and make the diagnostic.try again and see what is the result, if the battery is o.k or faulty.God bless you

Apr 05, 2013 | Fujitsu PC Laptops

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IS THERE SOMEONE OUT THERE WHO CAN GIVE ME INSTRUCTIONST TO OPEN UP MY LAPTOP ,TOSHIBA SATELITE P300-160????


Without robotic soldering equipment used at the time of manufacture you cannot repair soldered joints on a motherboard, they are simply too fine. Motherboards are also mulit layered and there are soldered joints between each layer that can easily be damaged by the heat introduced by someone trying to solder a joint. I the old days you could get away with replacing a motherboard battery manually, but these days even that is fraught with dangers. If you have a dry joint on a motherboard then you will have noticed problems from new and it would be covered by warranty, if it's a fault that has developed after a period of time and use, then maybe you should look at replacement parts or even a new machine.

Oct 09, 2012 | Toshiba PC Laptops

1 Answer

Laptop no power


Check the output of the AC adapter (Charger), or skip to check the DC Power Jack, first.

A) DC Power Jack:
The jack on the laptop that the AC adapter (Charger) plugs into.

IF, this is in reference to an HP Pavilion dv2000z series of Notebook PC, this is what the jack looks like not installed,

http://www.dcpowerjacks.net/catalog/index.php?main_page=product_info&products_id=1051

In the views of the jack, the pins and blade are on the Bottom of the jack.
They go down through the motherboard, and are soldered in place.

http://www.aaroncake.net/electronics/solder.htm

Scroll down to Step 5, and observe the Solder Joints.

IF, a solder joint, (Or more than one), is cracked, the DC Power jack will Not flow power to the laptop.

ALL power removed (AC adapter and Battery) see if you can gently wiggle the Center Pin, of the DC Power Jack. Using a non-metallic object is preferred.

See if the entire jack seems to move around.

ANY perceptible movement means a bad DC Power Jack, or solder joint/s.
Laptop is to be completely disassembled, down to the BARE motherboard in your hand. (No Processor, no Ram Memory, Nada )

This is a basic guide to DC Power Jack replacement,

http://www.laptoprepair101.com/laptop/2007/12/06/dc-power-jack-repair-guide/

A) You can use a 25 Watt soldering iron, with a No.2 chisel tip.
Keep a damp sponge handy, if you do not have one in a soldering iron stand. Keep the tip CLEAN, and well tinned, at all times.

B) Use Desoldering Braid. (Solder Wick)
Works MUCH better than a Desoldering Tool. (Solder S-ucker Tool)

Unroll a small length. Flatten out a small length, around 2 inches long.
Lay enough of the tip of the Desoldering Braid, across the solder joint to cover it. Then lay the tip of the soldering iron on top of the braid.

Once the braid, AND solder heat up enough, the fine twisted wires of the Desoldering Braid will pick up some solder.

GO S-L-O-W.

If you overheat the solder joint, the copper circuit trace area under it, can lift right off of the motherboard. Bad times are ahead.

If you overheat the solder joint, the copper circuit trace area under the solder joint, can lose it's tinning, and CANNOT be re-tinned again.
Bad times ahead.

As soon as the solder starts to melt, and you see the braid has picked up some, remove the solder iron, and braid.
Allow the motherboard circuit trace area to cool down.

Then begin again with a fresh new piece of Desoldering Braid.
Cut the solder soaked section off.

Keep going back, until you have removed all of the excess solder that you can.
(Make take a few times, or more, to perform this, and allow the circuit trace area to cool down in-between )

There will be a skin coat of solder left behind. As you heat one of the pins, or the blade, pull up on the jack.

The pin, or blade, will partially come out. It will not come all the way out because of the other pins, or blade, is still soldered in.

Go to the next pin/blade, and heat it up. Pull. The pins, and blade will come out of the motherboard a little further.
Allow the circuit trace area to cool down in-between heating each pin, or the blade.

Keep going around until the jack is free.
You might have a skin coat going across the circuit trace hole.
That's OK, leave it.

When the new jack is installed, the pins, or blade goes against this skin coat. When the soldering iron touches the skin, the pins, or blade, will poke through.

Make GOOD, shiny bright solder joints. A dull, cold solder joint, will have you scratching your head.

B) If the DC Power Jack proves to be good, with the simple test of the device to see if it will wiggle, go to the AC adapter. (Charger)

The Center Hole in the plug that plugs into the DC Power Jack, is Positive. The outer cylindrical metal shell is Negative.

Positive (Red) probe lead to Center Hole, Negative (Black) probe lead to outside cylindrical metal shell.

Function knob set to DC Voltage. (If just a symbol, the symbol is a dotted line over a solid line. If more than one scale, set it to the 0 - 50 Volt scale )

You should be reading VERY close to 18.5 Volts.

Also have an assistant wiggle the Power Cord, and the cable from the adapter unit, TO the laptop.

An intermittent reading indicates a broken wire.

DC Power Jack, and AC adapter check out, the problem is the power controller chipset.

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

http://en.wikipedia.org/wiki/Integrated_Circuit

The power controller chipset is a power MOSFET.
Here are two examples used in a Lot of laptops,

1) http://html.alldatasheet.com/html-pdf/85156/VISHAY/SI4925BDY/183/1/SI4925BDY.html


2) 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

When bad, generally the power controller chipset will burn up, and blacken.

Note that in both examples above, that the chipsets are in a D2PAK surface mount design.

The J leads are easy to unsolder, and solder.

Feb 17, 2012 | HP Pavilion dv2000z Notebook

1 Answer

I have compaq CQ50-215NR, and it has a problem charging.. If I play with the charger I can get it ti charge, but not for long.. I dunno if I can re Solder the connection to the motherboard if this jack is...


Take out the charger plug and with a sharp tool try to move the connections inside the socket. If they move then yes, the solderings have gone and you will have to redo them - it's not a complicated job, you just need to be careful when removing the bottom cover and to not overheat the motherboard.
If they don't move then it's the cable from the charger (almost surely is this) - just get a new charger.

Sep 07, 2011 | Compaq Presario CQ50-215NR Notebook

1 Answer

Hello, power failur on mother board p/n cp298380-01


So how is the DC Power Jack solder joints on that Fujitsu Lifebook?

The DC Power Jack (DC IN) is the jack on the laptop where the AC adapter (Charger) plugs into.

Do any of them look oxidized?
Dull finish on any of the solder joints holding the DC Power Jack to the motherboard.

De-solder and makes fresh solder joints.

Are any of the solder joints cracked?
Cracked at the area of the solder joints to the bottom of the motherboard.
Re-solder.

What condition is the DC Power Jack itself?
Physical condition of the jack.
Bad physical condition requires replacing.

Do you see any discoloration, or burn spots on the chips on the motherboard?
(I.C., Integrated Circuit = Chip and Chipset)

There is a sensor chip on the motherboard for power. Senses when the battery needs to be charged, or doesn't, and when the laptop is to just use the AC adapter power.

If so replace the motherboard.

Post any questions about the above in a Comment.
(Believe upper right of your page > Comment)

Regards,
joecoolvette

Dec 02, 2010 | PC Laptops

2 Answers

My Acer Extensa 4620Z seems to have a lose connection when I plug in the power cord charger because I have to keep turning it to make sure it holds. Is this repairable.


You will need to disassemble the notebook & bring the motherboard out to check the power socket into which you plug the power adapter. This socket will then need to be checked.
If the solder joints binding this socket to the motherboard are loose, you will need to re-solder it. If the socket itself is broken, you will need to replace it.

Apr 19, 2010 | Acer Extensa 4620-6456 Notebook

1 Answer

Dry joint problem on power socket


Hello,

First thing is to remove the top bezel. This is the piece of plastic between the keyboard and the display. Since you have removed all the bottom screws, you should be able to pop the bezel off by inserting the tip of a small flathead screwdriver under one of the plastic hinge covers. Check the back of the hinge covers for screws and remove any you see first. Once the bezel is off, remove the screws securing the keyboard and remove the keyboard. Be careful with the keyboard ribbon cable and the connector for it, they are fragile. Flip it over and remove any bottom panels. Disconnect the wireless antenna cables from the wireless card (usually black and white). Flip it over again. Snake the wireless antenna cables up through to the top and disconnect the other thicker cable (video and power) from the mainboard. Now you need to remove the display. After the display is off, remove the optical (dvd) drive. Remove any case screws you see from under where the keyboard was. You should be able to get it apart now. Be VERY mindful of connector wires/ribbons as you take it apart.

When soldering the joints (do em all on the power jack) be careful not to heat up the area too much as there are often very sensitive fuses close to the power jack. Do the joints quickly and do not use an excessive amount of solder. After you solder it, dry-fit the laptop back together and test it. If it's good, lay a small bead of hot glue around the base of the dc power jack to reinforce it.

Post a comment and let me know how you make out!!

Sep 04, 2009 | Fujitsu Siemens AMILO Pro V2010 Notebook

2 Answers

Charger wont charge not sure if the problems with the charger or the bit socket on the computer you plug into,prior to today if you wiggled the charger bit it charged now it wont


Hi!
I too had the same problem and posted my query on 4th September 2009 (yesterday) after I had tried a number of other things including replacing the battery.
I received a prompt response from joegoldman only a few minutes after posting the query. My sincere thanks to this person's excellent instructions I managed to dismantle my laptop and fix it on the same day.
It was indeed the dry joints causing the problem. I also had to apply some solder at the back of the power socket to stop the slight wobble of the pin on the power socket to prevent it from happening again. I also had to remove the hard drive and its base which was screwed on to the back panel through the mother board.
I suggest you too try out Joe Goldman's solution , which I am pasting here for your reference. Good luck. If I can be of any further help to you please let me know:

"First thing is to remove the top bezel. This is the piece of plastic between the keyboard and the display. Since you have removed all the bottom screws, you should be able to pop the bezel off by inserting the tip of a small flathead screwdriver under one of the plastic hinge covers. Check the back of the hinge covers for screws and remove any you see first. Once the bezel is off, remove the screws securing the keyboard and remove the keyboard. Be careful with the keyboard ribbon cable and the connector for it, they are fragile. Flip it over and remove any bottom panels. Disconnect the wireless antenna cables from the wireless card (usually black and white). Flip it over again. Snake the wireless antenna cables up through to the top and disconnect the other thicker cable (video and power) from the mainboard. Now you need to remove the display. After the display is off, remove the optical (dvd) drive. Remove any case screws you see from under where the keyboard was. You should be able to get it apart now. Be VERY mindful of connector wires/ribbons as you take it apart.

When soldering the joints (do em all on the power jack) be careful not to heat up the area too much as there are often very sensitive fuses close to the power jack. Do the joints quickly and do not use an excessive amount of solder. After you solder it, dry-fit the laptop back together and test it. If it's good, lay a small bead of hot glue around the base of the dc power jack to reinforce it."

Aug 23, 2009 | Fujitsu Siemens AMILO Pro V2010 Notebook

1 Answer

I have a vaio pcg-7l1m which will not power up. Have checked adapter and it's fine. Would like to open laptop and see if input is loose. anything I need to know about getting case open? Having opened other...


Hello,

When you say you checked the adapter, I assume you mean you put a meter to it and it is giving 18-19 volts. I also assume that no power means no led's, no fans, no nothing.

Before you tear it apart, please try the following to try and get some signs of life.

Remove the battery and try to boot. Leave the battery off for the rest of the testing. Remove the hard drive, and the optical (dvd) drive. There is likely a screw on the bottom that will release the optical drive. Try to boot. If no good, remove the ram and try again. The ram stick(s) are located under an access panel on the bottom of the laptop.

If all this produces nothing, your last effort may be to resolder the dc power jack on the mainboard. This is not that difficult but you need to be careful while doing this:

I like to keep two separate containers for screws...one for those from the bottom, and one for those from the top. If you own a video camera, maybe video the laptop as you do this. It could be a valuable reference when re-assembling it :)

First, remove the access panel from the bottom that provides access to the wireless antennas (2 wires). Pop the connectors off of the wireless card. You must do this to remove the display, as the wireless antennas are in the display. Next you need to remove the top bezel (strip of plastic above the keyboard. You may need to remove some screws from the bottom to release it. Gently, insert a small flat head screwdriver under one of the hinge covers (plastic bump over hinges) and pry up . Usually it is just plastic clips holding it on and it will pop off. You should be able to remove the bezel easily.....gently, remember? With the top bezel off, you can remove the keyboard (may have screws on the bottom holding it, but likely not. Remove keyboard screws on top, disconnect the ribbon cable and remove the keyboard. Now, snake the antenna wires that you removed earlier up through the top of the laptop. Remove any connector cables going from the display to the laptop. Remove the hinge screws holding the display on and remove the display. There might be two screws on the bottom securing the display as well.

Now, remove all screws on the bottom of the laptop and try to gently pop the plastic case apart. There may be screws under the keyboard (on the top side) that hold it together too. Take your time here, paying close attention to any connector wires....BE VERY MINDFUL OF TINY WIRES AND CONNECTORS.

Once you get the case apart, there will likely be a few screws securing the mainboard to the plastic case. Remove these (circle the empty holes from the screws with a marker so you know where they go back in)

With the mainboard out, locate the dc power jack. It likely has 3 or 4 solder joints securing it to the board. With a magnifying glass, inspect the solders for cracks in the solder joint. If they are cracked, that's likely the issue. If not, resolder them anyways. Using thin electronic solder wire (do not substitute with plumbing solder) heat each solder joint, and apply a SMALL drop of solder. Not too much, or it can run down into the connector and bugger things up. Be careful not to touch/heat up any other components near the jack too.

With this done, dry fit (without all the screws) the laptop back together. Make sure all the little connectors have been re-connected and while thinking happy, positive thoughts, try to power it up :)

If this won't get it to power up, then you likely need a new main board. If you can't find one for a reasonable price on ebay, get a new laptop. In my experience, Sony will not sell a mainboard to anyone other than an authorized Sony service shop, and even if they will, it will likely cost $400 or more.....too much to spend on a part (likely refurbished) with a 90 day warranty.

Hope this helps! Post a comment and let me know how you made out.

Aug 23, 2009 | Sony VAIO VGN-AR230G Notebook

1 Answer

How do I replace the LCD inverter in a Gateway 3018GZ laptop?


Hi,
Remove the screen bezel (plastic screen surround), this will reveal the whole screen. At the bottom of the screen you will see an elongated piece of circuit board with wires coming from either end covered by frosted plastic.
That is the inverter, to remove it gently pull the plugs from each end and remove the screw from the middle and pull the board away and replace it.
If you have not got a replacement yet look at the inverter for a copper coil, if you re-solder the solder points around the coil you may find it works again as components that suffer from extreme heat the solder joints dry causing bad connections, re-floating the solder solves the problem in 90% of cases.


Good luck.

Aug 06, 2009 | Gateway PC Laptops

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