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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Posted on Jan 02, 2017

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LVM-37w1 after 5 minutes of viewing, picture and sound go off. Blue power light turns orange. attempts to turn on TV are unsuccessful. Blue light immediately turns orange.


I saw this fix posted on another blog by a fellow named Patrick. I tried it today and it it worked. It fixed my Westinghouse lvm-37w1. Basically disassemble the back of the TV (removing all the screws on the edges and middle). Remove screws holding bottom speaker and stand. There are 2 chrome rods extending down. There are small screws inside holding them on. You can turn the rods and unscrew the screws but need a small screw driver to put them back on. Remove the black cover on the back. remove the plates on the lower middle section. You will expose a printed circuit card. unplug wires and unscrew 4 screws holding it in. Remove it, turn it upside down and inspect the solder joints near the lower middle (especially under the gray relay on the other side). I found 4 solder joints that were cracked. Resolder the larger solder joints that are cracked or look bad (small solder joints are too delicate). Put it back to gether and it should work now. Mine works great. No more black screen with no sound.12_2_2011_5_11_21_am.jpg

Sep 29, 2011 | Westinghouse LVM-37w1 37 in. HD-Ready LCD...

1 Answer

TV turns off or gose black then come back on


This is typical with many sets when it goes old as there is a high possibility that the components over a period of heating and cooling , tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs.

Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points. Please remove the SMPS and check as it can have poor solder joints. Look for bloated capacitor in the circuit.If seen replace and check.

Jun 16, 2011 | JVC AV-48P575 48" Rear Projection...

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 | Computers & Internet

1 Answer

Thin vertical line, high tension problem ?


Is very unlikely that the high tension system would cause the vertical to collapse but for sure there's a cold/crystalized solder joint near or the vertical IC. I would suggest to check the solder joints from the vertical IC as well from the high power resistors or from areas that looks like they a have exposure to overheating components.
The reason that the TV works when the back cover is removed is because the board might be get a bit loose and the solder joints make electrical contact. With the back cover ON, the board sits straight and the slightly movement causes the solder joint to loose its contact.
Let me know if you need further assistance.

Mar 04, 2010 | Hitachi 32UX59B 32" TV

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

The A/c does not work in the rear.I have a 1996 nissan quest


you have a bad solder joint in your heater control head. If you can solder, you can fix it. I will fix it for $25 and send you a control head. Then you send yours back to me.

Here's our Villager/Quest web site.

http://groups.yahoo.com/group/villagerquest/links

4b29200.jpg
You have to remove 4 plastic screws on console bottom. Then remove 2 screws at bottom of center trim panel. Then remove ash tray and 2 screws just above tray opening. Then 2 screws at top of center trim panel. Then pull off center trim panel. It has 2 spring clips in center.
Then remove 4 screws holding control head in.
Remove all electrical connectors.
remove thin plastic cover on bottom of unit. 2 plastic clips hold it on.
remove circuit board, and look on back side for crack around solder joint that is circled in red on picture. Or the joint next to it.
resolder the cracked joint. Don't heat the joint too much. Just enough to get solder to drop on to it.

Jun 29, 2009 | 1996 Nissan Quest

1 Answer

It won't stay on


The solder joints to the DEW Sensor are "cold joints" which means that the solder joint is defective - is not a sound joint. This means that with temperature variation, the solder joint can intermittently separate and break the circuit, causing the DEW Indicator to come on and completely shut down the camera.
Here is a picture from the perspective of the tape cover being at the top of the picture and the rest of the camera at the bottom. The dew sensor will be on your left.

go to:
http://omlets.tripod.com/sharpdew.jpg

Get a real slim soldering iron with a fine point. Open the tape cover and take the tape out. Get a strong light to shine down into the mechanism.
You may see a brownish material on or around the solder joint - this is flux used in soldering which was applied too heavily, and not heated long enough to burn off. The joint therefore doesn't quite connect the dew sensor to the terminal post - depending upon heat/cold ambient conditions, sometimes it makes contact and sometimes it doesn't .
Heat up the soldering iron - make certain the point is tinned (has a thin film of solder on it). Carefully just touch each solder joint for a couple of seconds - just enough for it to melt, and then quickly remove the soldering iron. You don't want to leave the iron in contact with the solder too long or it may melt other insulation around the terminal. This all probably sounds more complicated than it really is - but it really is just a 5 minute operation. If you've not done much soldering, and feel uncomfortable about trying it, you may want to take it to a radio, tv or computer repair shop and ask them to do it for you.




Feb 20, 2009 | Sharp Viewcam VL-Z1 Mini DV Digital...

2 Answers

Sharp VL-Z900


The solder joints to the DEW Sensor were "cold joints" which means that the solder joint is defective - is not a sound joint. This means that with temperature variation, the solder joint can intermittently separate and break the circuit, causing the DEW Indicator to come on and completely shut down the camera. Here is a picture from the perspective of the tape cover being at the top of the picture and the rest of the camera at the bottom. The dew sensor will be on your left.

go to:
http://omlets.tripod.com/sharpdew.jpg

Then, get a real slim soldering iron with a fine point. Open the tape cover and take the tape out. Get a strong light to shine down into the mechanism.

If your camera is like mine was, you may see a brownish material on or around the solder joint - this is flux used in soldering which was applied too heavily, and not heated long enough to burn off. The joint therefore doesn't quite connect the dew sensor to the terminal post - depending upon heat/cold ambient conditions, sometimes it makes contact and sometimes it doesn't .
Heat up the soldering iron - make certain the point is tinned (has a thin film of solder on it). Carefully just touch each solder joint for a couple of seconds - just enough for it to melt, and then quickly remove the soldering iron. You don't want to leave the iron in contact with the solder too long or it may melt other insulation around the terminal. This all probably sounds more complicated than it really is - but it really is just a 5 minute operation. If you've not done much soldering, and feel uncomfortable about trying it, you may want to take it to a radio, tv or computer repair shop and ask them to do it for you.



Jan 15, 2009 | Sharp VL-Z5 Mini DV Digital Camcorder

1 Answer

Adding a remote USB port


I solved my own problem.1 I removed radio1.gif face 2 I removed back cover of radio face to expose USB solder joints.3 I drilled a hole in the back cover of radio face over solder joints 4 I drilled a hole in front cover of radio behind face plate and lined it up with hole in back cover of face plate.5 I cut the male plug off of a USB extension cord and ran it through factory notch on the back of radio,through drilled hole on front panel of radio, thruogh drilled hole on back cover of radio face and soldered wires to back side of USB plug in. Wire colors from top to bottom are Red, White, Green, Black. Solder sheild to any of the three larger solder joints next to these connections. Make sure wires are not touching any other connections. Put radio back together and add screw that locks face to radio. Face can no longer be removed with this wire added. Now I can plug in my 8gb memory stick1.gif,hide it under the dash and have a clean looking installation.

Jan 17, 2008 | Kenwood KDC-MP435U CD Player

2 Answers

Sony dav s400 protect sign?- HELP!


 NAME:  POPOOLA SAMUEL OKE 
EMAIL:greatpopson@yahoo.com
open the system and remove the cables (white cable) that are installed on the panel at the right hand-side.Replace the dettach cables after 10minutes,couple the system back and insert your cd.
i am sure it will work fine.

nb: the white cables are about 5cables at different location on the panel.

Aug 31, 2007 | Sony DAV-S400 System

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