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Should i use lead free or leaded solder on my LG 60PZ550 z-sustain board inductor joints.

I don't want to mix solder. Do I need to completely remove the old solder just to be sure before repairing the cracked joints?

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  • LG Expert
  • 157 Answers

From repair point of view, it doesn't mater, from factory point of view, it mast use lead free soldering, it is a law requirement.

Posted on Aug 11, 2017

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Hi, There are 3 versions of this motherboard; 1.0, 2.0 & 3.3, but the layout is identical. The general layout is shown in pins.jpg. For the power led, the white wire goes to the (-) terminal either pin 2 or 3, both are MPD- while the green goes to the ( ) or pin 1 (MPD ) as shown in powerled.jpg HDDpins.jpg shows the connection of HDD led, the white goes to pin 3 or HD- while the red goes to pin 1 or the HDD . I cropped these images from the manual which is also available at the gigabyte website. Hope this gives you some ideas and workout of you. Good luck and pls post again how things turn up. Kind regards.

Posted on Aug 15, 2007

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SOURCE: Hitachi 50UX22B Convergence Problem

there is a company called pts that will rebuild the board for u just send it in the will repair it and send it back , alwways use your wristground strap.

Posted on Jan 10, 2008

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SOURCE: shure beta 58a mic dismantle

Musman4:

i have 58S, which should look very much alike.

if you can see a screw in a small recess near the tail (not the 2 screws over the switch), remove it.

it you do not find this screw, probably because you lost it, so the 3-pin socket came out. Also, there is a C shape insert, wriggle and raise it, it should pop out.

good luck!

pc-cook

Posted on Jan 25, 2008

petraman7
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SOURCE: Pioneer D711

Hi...
Is there an access cover with screws in it underneath?
MOst of the receivers have something like that.
I would also check the output PCB assby for shorts or opens.

Posted on Mar 24, 2009

SD Tech
  • 14553 Answers

SOURCE: Need assistance changing the convergence IC's

I have step by step start to finish instructions for this repair if you want them.

You can use regular solder--the original is lead free, it does not matter.

If you want the instructions rate this solution with 4 thumbs and I will post the instructions for you.

they will tell you everything you need to do the repair and step by step start to finish instructions.


SD TECH

Posted on Nov 09, 2009

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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

My hitachi ultra vision digital hdtv 53 inch turns on but the screen will not light up ,i checked the power board with magnifying lens and found some cracking solder joints . I repaired them, plug in the...


Just removing and re-inserting a circuit board can make it look like you have temporarily fixed something as it disturbs soldered joints but as the board heats up, the fractured joints open back up.

Some factured solder joints cannot be seen unless viewed by at least 5x magnification so you may have to re-solder other connections that you may have temporarily disturbed but missed. You need to make sure you only use lead free solder on this model of TV as mixing Tin/Lead (called 60/40 or 63/37) and lead free causes brittle solder joints that are prone to cracking.

The best way to re-solder a joint is to remove all old solder to ensure you do not have compatability problems. I recommend removing and resoldering at least 3 times if you are soldering with a different solder.

If the fault is not down to solder joints, heating the components when you re-soldered them could have made them work again for a short time, this is especially true with capacitors.

One last thought is that most TV's have a seperate inverter board which could be suffering the same problems. You do not mention if the TV sounds like it is working and just has a blank screen (inverter fault) or if the TV is not working at all (psu fault).

Feb 06, 2011 | Hitachi 53FDX20B 53" Rear Projection...

1 Answer

Monitor cuts out


Look for bad solder joints on all 4 round inductors, remove the old solder first and clean the leads real weel and resolder, also check the transistors and caps.
http://s807.photobucket.com/albums/yy352/budm/HP%20F1703/

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

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

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Oct 05, 2010 | HP Pavilion F1703 17" LCD Monitor

1 Answer

MONITOR WENT BLANK AND WILL NOT START


Look for cold solder joints on all four round inductors, you will have to remove the old solder first, clean up the leads and resolder the leads back on, also ckeck the purple casing caps for bulging seals at the bottom of the caps, also the transistors.
http://s807.photobucket.com/albums/yy352/budm/HP%20F1703/

Basic LCD monitor troubleshooting guide:

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

Oct 02, 2010 | HP Pavilion F1703 17" LCD Monitor

1 Answer

My hp pavilion F1703 monitor goes blank about every 30 seconds.


Thsi model has known problem with bad solder joints due to contamination, you need to remove the old solder on the four inductor leads, clean the leads eal well and resolder, see my pictures here: http://s807.photobucket.com/albums/yy352/budm/HP%20F1703/
Al so look to see any one of the capacitors have bulging top, they should be completely flat top.

Jun 06, 2010 | CTX S762A 17" LCD Monitor

1 Answer

Screen is black. green light on ac adapter blinks briefly about every 2 seconds


Look for bad solder joints in the inverter circuits, look at the round inductors (4) leads soldered to the circuit board, post or send pictures for futher help.

Feb 02, 2010 | HP Pavilion F1703 17" LCD Monitor

3 Answers

How to replace power jack on sony vaio pcg-k33


Short version?

1.Remove the AC adapter if plugged in, remove the battery.

2.Wear an ESD wrist s-trap, and have it connected to a good ground. Work on a table, have a container with multiple compartments for the screws, and mark where each screw came from. There are as many as 65 screws, and 8 different sizes.

3.Completely disassemble the laptop, down to the bare motherboard in your hand. Remove the LCD screen assembly. No Processor, Cooling Tube, Heatsink, Ram Memory modules, CD/DVD drive, Harddrive, Wireless Antenna module, Keyboard, Nada!

4.Buy a replacement DC Power Jack.
Here is an example of one,

http://powerjack.us/index.php?main_page=advanced_search_result&search_in_description=1&keyword=Sony+Vaio+PCG-K33

5.Use the correct tools.
If you're a really experienced tech, you can use a 30 to 40 Watt soldering iron. No.2 tip. Have a clean damp sponge nearby, to constantly clean the tip.
Make sure the tip is clean and tinned correctly.

Or use a medium priced soldering station.

I advise using soldering wick, (Desoldering Braid), instead of a Desoldering Tool. Works much better.

5.Use the correct soldering procedures.

Linger too long when heating up the solder joint, to remove the DC Power Jack, and you stand the chance of burning the board. (Motherboard)

Also could lift the Circuit Trace right off of the board.
(Circuit Trace may be thought of as a very thin, copper wire on the motherboard. It isn't, but this explanation will do)

Do any of the two errors above, and you can use the motherboard for a Frisbee.

My method for removing the DC Power Jack, is to pull up on one lead at a time. Use constant pressure with my finger, and thumb. (Don't get 'Godzilla' on it. It can break. Everything has it's limits!)

I heat the solder joint for that one lead, and try to pull it up, a little out of the board. Then I move over to another lead, heat it, and pull up slightly on it. Keep moving from lead to lead, until finally they start pulling out.

After the jack is removed, the area needs to be cleaned. I use 90 percent Isopropyl Alcohol, and Q-tips.

CAUTION!!!!
This is HIGHLY FLAMMABLE! Keep it away from that hot soldering iron, and use in a Well ventilated area.
Always immediately return the cap to the bottle, and tighten the cap well.
Have fire precautions ready, just in case an accident happens.
Better Safe, Than Sorry!

The area of solder, around the hole in the board for the jack, may need to be buffed off. (Fine sandpaper in a tight roll, or a fingernail file using the fine side)

All areas that will accept solder need to be clean, and tinned.
Tinned, ...is the area is cleaned, a light spot of flux is touched around the rim of the hole, then solder is applied. The hole's rim then has fresh solder around it, and is ready to accept the DC Power Jack lead.

Be sure you have good solder joints! You may not see a cold solder joint, until you put the laptop back together, and the jack doesn't work. Then you get to take it all back apart, look at your solder joints, and go "OH".

This may help you in disassembling,

http://www.insidemylaptop.com/disassemble-sony-vaio-pcg-k-notebook/

Oct 19, 2009 | Sony VAIO PCG-K33P Notebook

1 Answer

Video Out Genius needed


You better check for loose connection or cold solder joint,Unfortunately, the solder connection alone is often used to make both the electronic as well as the mechanical connections. Solder is made up of 60% lead and 40% tin, so it can not be expected to do the mechanical job for long. Designing larger circuit board traces does help to increase the surface area as well as strengthen the pad and the trace leading to it. To minimize stress to the soldered connections, physically heavy components — as well as all frequently used switches and connectors — should first be mechanically secured to the PCB. joint.jpgFigure 1 has been magnified and enhanced to show four solder pads that have potentially cold joints. Counter-clockwise from lower right, the initial problem isn't so easy to spot, just a slightly "grey" or frosted joint, with each counter-clockwise joint getting progressively worse. This is what ultimately happens when a little pressure is applied over and over again via both mechanical stress and repeated heating and cooling cycles. This would be the case in any studio and especially on the road. Once in this state, the connector could easily be removed from the circuit board with little effort, without soldering. Sometimes the solder connection holds up, but the junction of the PCB trace and the PCB pad will break.

Aug 31, 2008 | Sony Hi8 Hi-8 Tape

3 Answers

Rca hd52w59 convergence problem


there is a special fuse on the power deflection board. when blown this causes the processor to think it a crt tv. The fuse calle fl231 is a small brown rectangular fuse in the middle of 3 just like it next to the flyback transformer the big black thing with the large red wire comeing out. ussally it blows because the solder connections on the flyback. WARNING high voltages are generated by flyback. be careful please

Dec 27, 2007 | RCA HD52W59 HDTV Projection Television

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