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Question about Solding on the screen board

Quick question how do u remove the old ones just with the soldering iron .. like burn them off ? might sound dumb but i never soldered over anything before just put new stuff on boards lol

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The easiest way is to use a product called "Solder Wick", it's braided copper with a chemical in it that sucks up the old solder. You just out the braid against a solder joint then put the solder iron against the braid. The other method is to simply heat all three transistor leads (on old one) and the same time and put it out. This is messy and makes putting the new one in much harder.

Geno

Posted on Apr 03, 2008

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How do I replace the race slot on my amp do I need to take out the whole board and get it from the other side and is ther any soldering involved


Removal I can help with. Finding the RCA jack is a little tougher. This part is on you.

Does the circuit board remove from that back plate, where the RCA jack pokes through?
It would be nice to get it out of the way.

The RCA jack does unsolder from the bottom of the circuit board.

Suggest;
1) Use a low Wattage soldering iron. Put a soldering GUN aside.
TOO much heat.
20 Watt soldering iron.

2) Soldering stand, or at least a damp sponge nearby to constantly clean the soldering iron tip.
The soldering iron tip NEEDS to be well tinned, and clean.

3) No.2 chisel tip. It will make your life SO much easier.

[Soldering tip is taken down to the bare copper. Then heat soldering iron. Do not leave plugged in too long. Use Rosin core solder, and I would recommend .030 in size.

Soldering iron tip hot, touch the rosin core solder, and give a light coat of solder. -> Tinning ]

Removing that RCA jack to me, is just like removing a DC Power Jack, from a laptop motherboard.

First thing you want to do, is remove as much solder as possible, from each solder joint, on the bottom of the circuit board.
I use Desoldering Braid. (Solder Wick)

http://www.radioshack.com/product/index.jsp?productId=12580047&filterName=Type&filterValue=Desoldering

Unroll the wick about 6 inches.
Lay about 1/2 inch of wick across the solder joint. (Solder connection on bottom of circuit board)

Put the soldering iron tip on Top of the wick, and on top of the solder joint.
When the wick starts to absorb the melted solder, remove the wick.
Cut off the solder soaked wick part, so you will have a new wick surface to operate with.

Keep going around the solder joint, until most of the solder joint is removed. You will NOT remove all solder. You are JUST trying to remove the majority.

Perform for all solder joints (Connections) on the bottom of the circuit board, for those RCA jack leads.

GO SLOW.
Remove solder from one lead -> STOP
Allow the circuit board to cool down.
Then continue on.

Circuit board on it's side on the workbench, hold the insulated part of the RCA jack with one hand.

You want to rest your hand on part of the circuit board, (If possible), and use the heel of your hand as a fulcrum.
Fingers constantly applying pressure to the jack, pulling jack away from circuit board.

Heat one of the solder connections up on the bottom of the circuit board. Applying pressure with your fingers, see if this one lead will start to come out of the circuit board.

STOP

It will only come out so far, as the other leads of the RCA jack are still holding it in.
The method is to heat one solder connection, try to pull the lead out of the circuit board a little, then go to the nearest lead; and heat it up.
(Heat it up = Melt the solder)

Keep pulling the leads out a little at a time, and going from lead to lead, until they all come out of the circuit board.

NOTE*
What look to be very flat thin copper wires, on the bottom of the circuit board, are actually Circuit Traces. Also known as Signal Traces.

IF, you heat the solder joint (Connection), too long, you stand the chance of ruining the circuit board. This = No.

You can lift the circuit trace right off of the motherboard, using too much heat.
You can burn the circuit trace 'hole', and this will make it so it will NOT accept solder again. (You can't tin it )

GO SLOW. You have as MUCH time as you need.

Suggest melt one solder joint a little, pull on on it's lead, then allow the circuit board to cool down some.
Then go to the nearest lead, heat it's solder joint, pull up; then let the circuit board cool all the way down.

You get the picture

[Leads are the 'stiff wires' coming down from the RCA jack.
Circuit trace 'hole', is the hole where the lead goes through in the circuit board ]

When the damaged RCA jack is removed:

There will be residue left behind on the circuit board 'hole'. This needs to be properly cleaned.
I use Isopropyl Alcohol, and an old toothbrush.

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

Yeah, I know. A disclaimer. I just want to make sure you do not get hurt.

Means circuit board well away from the hot soldering iron, when cleaning.

Info that may help,

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

There may also be a thin coat of solder over the circuit trace holes, left behind.
DO NOT worry about it/them. Leave alone.

When you go to install the new RCA jack, you will cut the leads until they are about 1 inch long, if not already that length.
Bend the leads so you can try a trial fit, and make sure each lead is going towards it's circuit trace hole.

Leads of the RCA jack pushing against (Lightly), the circuit trace hole, and the thin solder 'skin'.
When you heat the circuit trace hole from the bottom of the circuit board, the solder 'skin' will instantly melt, and allow the RCA jack lead to poke through.

Don't know if you used to solder back in the day, but solder has changed now. It is 'green', and no longer contains lead.
Makes it a @$#@^ if you are soldering with it the first time.
Suggest practice on soldering wires together, and perhaps an old circuit board.

The solder joints you make MUST be clean and bright. They should look like a 'Hershey's Kiss' when properly done.

IF, you make a bad solder joint, it is a Cold Solder Joint.
This = No.
You'll be pulling your hair out trying to figure out what is wrong, when it is just a cold solder joint.

You may wish to also view some soldering tutorials on Youtube,

http://www.youtube.com/watch?v=fYz5nIHH0iY

Check the - Related videos on the right also.

For additional questions please post in a Comment.

[Even though you can see I'm pretty 'Windy', I feel like I have left something out ]

Regards,
joecoolvette

Nov 11, 2012 | Computers & Internet

1 Answer

How to take out 2 bad capacitors in my magnavox modle 50f231d/37


Get a soldering iron, some solder and solder wick. Use the wick and the iron to remove the solder off of the legs of the cap. Remove the cap. Install the new cap exactly the same direction the old one was in. With solder and iron, solder the legs on to the board. Cut off the extra length of the legs and you are done.

Apr 14, 2011 | Toymax Magnavox 37MF231D 37 in. LCD TV

1 Answer

Backlight on slide temperature control , passenger side out. 2005 tahoe how to replace


go to radio shack, buy 12v led light, sub min size.

remove back cover, remove knobs from front.

you will need a solding iron, unsolder light, check for + side of

led and + side on broad and solder led in place, install front and knobs

and install back and screws, install in truck

Feb 07, 2010 | 2005 Chevrolet Tahoe

1 Answer

How to replace convergence ICs in samsung


You will need:
  1. Convergence ICs.
  2. Heat sink grease or thermal compound.
  3. Soldering iron.
  4. Solder lead.
  5. Digital multimeter.
  6. Solder pump.
  7. Small side cutter.
Steps:
  1. Unplug the unit from the AC outlet.
  2. Remove the screws and take the back panel off the TV. The convergence ICs are located behind a large heat sink.
  3. Remove the board that the ICs are on.
  4. Check all the big resistors on the board using the digital multimeter. Some resistors are connected in parallel so they read half of their nominal resistance.
  5. Check the board for cracked solders and tracks.
  6. Cut all the legs of the ICs and unscrew them from the heat sink to take them out.
  7. Remove all the legs by applying soldering iron on one side and pulling on the other side.
  8. Clean the holes for the new ICs with the soldering iron and solder pump.
  9. Clean the heat sink from the old thermal compound or grease and apply the new one to the ICs.
  10. Fit the new ICs legs on the holes and screw them to the heat sink. Wipe excessive grease. Make sure they are making good contact with the heat sink.
  11. Cut excessive length of legs. Leave about 2mm and solder it in.
  12. Clean solder points with lacquer thinner or even alcohol.
  13. Make sure no solder is going to two legs at the same time.
  14. Put all back together.
  15. You may need to readjust the convergence on the menu.

Oct 24, 2009 | Samsung HCN653W 65" Rear Projection...

1 Answer

How to remove and replace damaged power relays


The relay is soldered onto the circuit board. Unsolder the connections using solder wick. Solder wick is a fine copper braid that soaks up solder as it melts, leaving the connection clean so you can remove the old part. You also need an appropriate soldering iron and solder for electronic work. Rosin-core solder, small diameter, and a 40-watt iron are sufficient.

Once you have the correct replacement part, remove the old one and solder the new one to the circuit board in its place.

Apr 26, 2009 | Sony STR-DE675 Receiver

4 Answers

My MLT386Y power supply in AKAI LCT37Z6TA burned out and I bought


where can I find amlt386y power supply? and how much?

Apr 01, 2009 | Televison & Video

2 Answers

Fixable at home?


This problem is a design flaw on all Magellan Maestro GPS from the 3100 series to the 4xxx series.  This problem can easily be fixed, but you need to be handy with a soldering iron.  
NEEDED: 1. Fine tip soldering iron, solder, soldring flux or paste.

1. Remove the four screws on the back of the unit holding the back cover to the GPS 2. Pry open but be very careful, make sure the SD card slot is empty 3. Open from the SD card slot side and then remove the cover slowly, remove the speaker cable 4. Use soldering paste or soldering flux, apply some to the leads of the yellow female DC port on the PC board 5. Heat the soldering iron to temp, and then press the solding iron against the leads of the yellow dc port and also apply some solder. 6. Do this to all four terminals of the dc port 7. Now plug in the dc power jack into the port and make sure the unit is charging...  8. Replace cover, make sure the audio and power jack is in the slot first, then close the cover and screw in the 4 screws.
DONE!
Hope this helps

Mar 11, 2009 | Magellan Maestro 4040 GPS Receiver

1 Answer

How do I clean this set?


first,unpluged the ac cord,then open the back cover,after that try to remove all the dust by using the a 2 inch paint brush.after that you need to visuallized the parts or the semi conductor if thres a cold solder,you need to use soldering iron to fix the cold solder or loose connection of the parts.look the wire of RGB or red green blue of the neck board.try to re-solding the connection between the mother board and neck board.make sure, no leads drop to avoid short circuit.


kira_yuk99@yahoo.com
Technician

Jan 11, 2009 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Convergence ic


You will need to replace your convergence IC's. They are located on the D Board, left side board that is mounted flat on the bottom. They are on the two large heat sinks you can see at the back of the tv. Get the part numbers off those and order some new ones along with thermal grease. You'll need a good desoldering gun or braid and a good solding pencil. Buy thin soldering not the thick stuff. Radio Shack is a good place to get irons and solder for the job.

Jun 11, 2008 | Sony KP-46WT510 46" Rear Projection HDTV

3 Answers

Nintendo ds


Possibility that flex cable from top LCD screen, which passes through right-hand hinge, has become damaged, torn or has slightly pulled out of its connector socket.

Nov 17, 2007 | Nintendo DS Lite Console

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