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Re: Question about Solding on the screen board
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.
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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.
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.
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,
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.
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.
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.
Hope this helps
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.
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.