Question about Mitsubishi VS-4543 45" TV

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PICTURE GOES OUT ON MY MITSUBISHI MODEL # VS-4543.

How doIget at the back of the circuit board to check for loose connection with soldering iron??

Ed,

Posted by edz_11 on

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Anonymous

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Disassemble the set.

Posted on Oct 14, 2008

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Raccordement fil d'antenne sur circuit il est coupe et je ne sais ou le souder


Step 1:
google translated


antenna wire connection on the circuit is cut and I do not know where the weld

antenna wire connection on the circuit is cut and I do not know where the weld

you might need to solder it
You attach wires to printed circuit boards (PCB) in a process called soldering. You heat the wire and PCB pad, melting the solder wire and allowing it to flow onto the wire and pad. The solder wire used is typically a lead-tin alloy although in some special cases, silver is used. Soldering a wire to a printed circuit board may be part of making, repairing or modifying the board or connecting it to another device.

Clean the pad on the circuit board where the wire will be attached. Gently rub the eraser on the pad until it is clean and shiny. Strip about 1/4 inch of insulation from the wire. Tin the end of the soldering iron by melting a small amount of solder onto the iron tip. Heat the wire end with the soldering iron for a few seconds and briefly touch the solder wire to the bare wire, just long enough to melt the solder, and let it flow into the stranded wires. This is called tinning the wire. Tinning the wire is not necessary with solid or single strand wire. Insert the wire end through the hole in the circuit board pad from the top or component side of the board. Bend the end of the wire slightly to prevent the wire from falling out while soldering but do not let the wire end touch any other component lead or another pad on the circuit board. Apply the soldering iron tip to the wire end and solder pad at the same for a few seconds until the solder used to tin the wire end melts. Apply just enough new solder to make a dome-shaped puddle on the pad that covers the hole and the wire. Remove the iron from the pad but do not move the board for a minute. Cool the new soldered joint and do not move the board until the solder hardens. Clip the wire end off with the wire cutters. The wire is permanently attached to the printed circuit board.

Soldering Guide http://www.kpsec.freeuk.com/solder.htm b> b> b> How to Solder to a Circuit Board: Skill Set (with Video)
http://www.popularmechanics.com/cars/news/4213423

Mar 14, 2013 | Computers & Internet

1 Answer

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

Sylvania tv gets thin line where picture should be. Problem comes and goes. What is this?


The problem is in the circuit board, there are bad solder connections near the high voltage transformer and the vertical deflector ic. If you are handy with a soldering iron unplug set, remove the back cover, "several screws" and check the underside of the board on the right side, when in dought touch up with soldering iron.

Jun 20, 2011 | Sylvania SRCD227 27 in. TV/DVD Combo

1 Answer

Audio only plays out of one ear and it's not the ear buds fault because I have tried 4 or 5 different earbuds but the problem still persists


This is likely an issue with a loose connection in the jack in your player. If it is still under warranty, then you should be able to get it repaired or replaced using your warranty. If it is not, and you are not VERY mechanically inclined ... you can take it to a professional to get it repaired ... but depending on the cost of the unit, you might just be better off buying a new one than paying to have it fixed. If you ARE very mechanically inclined, and the unit is no longer covered under warranty, you can check the jack's connections and fix the loose one (if one is loose) or try replacing the jack inside the MP3 player ... but this is not as easy as it sounds due to the small size of the circuit boards and their sensitivity to heat (you will probably have to use a soldering iron, which can easily overheat a circuit board if you are not REALLY good with it).
If paying to have the unit repaired is not going to be worth the cost, and your unit is no longer under warranty (so it doesn't matter if you break the player, considering that your only other option is to buy a new one anyway) then give the repair a shot yourself -- the only thing you have to loose is a broken MP3 player. Open the unit up and find the headphone jack. Use a voltmeter to check the connections from the jack to the circuit board -- if those connections are good, then you have a bad jack. Go to Radio Shack (or somewhere similar) and get a new jack that is exactly the same as the one that you have in your unit. Use a soldering iron to loosen the connections from the circuit board to the jack (to avoid overheating the board, only touch the soldering iron to the soldered joint for a second or two at a time until the solder holding the jack in place JUST melts enough to pull the connection apart. Then, after giving the unit a while to cool, install the new jack with the same technique. Hopefully, you can get the new jack installed without harming the other circuitry, and you should be good to go. If anything goes wrong, the unit will probably not function again ... so make sure that (unless you are used to doing this type of work) this is your LAST option before buying a new MP3 player. Of course ... if it works, you will have every reason to be proud of yourself for being able to do it (and you will have confirmed your skill with a soldering iron). Good luck!

Jun 03, 2011 | RCA Pearl TH1102 MP3 Player

1 Answer

The overhead temperature and directional has stopped working, how do i fix it?


I had the same problem. If you take the compass unit out of the over head plastic housing you will see two small resistors near the left side of the circuit board. In my case the resistor had come unsolder ed due to heat and expansion. The surface mounted resistor popped loose. I resoldered both resistors with a 25 watt soldering iron.

Oct 25, 2010 | 2006 Toyota Tacoma

1 Answer

My crt monitor has been displaying horizontally coloured lines.iam chechking all the cables but it is ouite right now pls help me


Hello,this is vertical IC loose connection. The vertical output components either a transistor or an IC is probaly got a bad solder joint. Also another possibility is the deflection pins. Buy soldering iron and solder from electronic work to repair the connections.Take the back off of it after it is unlpugged and disconnected from the computer and check the bottom of the circuit board for bad solder joints.I recommend you to be serviced by a technician.

Feb 05, 2010 | Zenith L13V36 13" Flat Panel LCD Monitor

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.


[email protected]
Technician

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

1 Answer

Picture on RCA TV shrinks to a horizontal line


Hello,
Sounds to me you have a cold solder joint ( loose solder connection ) on the printer circuit board around or on the vertical chip or on one of the vertical capacitors. You may also have a bad vertical chip or a bad vertical capacitor, but I doubt it since it did come and go. I'de get a soldering iron and some solder and touch up the connections. I will remind you that you need to always excersise saftey by making sure, before removing the back, unplug the TV from the wall, and use care not to come in contact with the large red wire going to the back of the picture tube as the picture tube can be turned off and still store lots of voltage ( up to 35,000 volts). Always stay safe and when soldering, use care not to run solder across places that will make a short.
Good Luck and I hope this helps
Ed Meshechek ( Radio Man )
NC Electronics
Mills, Wyoming
307-266-4675

Dec 19, 2008 | Televison & Video

1 Answer

Sharp 36in tv


Your problem may well be a loose connection ( cold solder joint ) on the printed circuit board. A person would need to disassemble the set and remove the printed circuit board so that you can view the soldered side. Look for any connections that may be loose or discolored ( the color on all the soldered places should be a shiny silver color ). When you have located these area or places that seem to be different or loose, resolder them with a soldering iron, and electronic solder lead.You set should be fixed. Good luck and I hope this has helped.
AS A NORMAL PRE CAUTION, ALWAYS UNPLUG THE SET BEFORE OPENING OR REMOVING THE BACK

Ed
NC Electronic
Mills, Wyoming

Feb 18, 2008 | Televison & Video

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