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Xbox360 Forums => Xbox360 Hardware Forums => Xbox360 General / Hardware Chat => Topic started by: mezmerize1 on January 26, 2007, 08:18:00 PM

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 26, 2007, 08:18:00 PM

does anyone know a good way of removing these??
(IMG:http://i51.photobucket.com/albums/f375/Mezmerize1/normal_motherboard.jpg)
i was able to remove the two little metal legs that were soldered to the board but it seems like the actual black part of it is glued or something to the mobo. is there any good way of removing this or has anyone done it before and whats holding it on the board?

Title: Neeed Help Removing A Transistor
Post by: JEB-101 on January 26, 2007, 08:24:00 PM

Why would you want to remove those anyways? Probly a bad mobo.. but I would say either get a heatgun or something to heat it up a bit should pop raight off.

(IMG:style_emoticons/default/beerchug.gif)
JEB

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 26, 2007, 09:05:00 PM

well i shorted out the transistors and im replacing them with good ones, thats why im trying to take them off. but wouldnt a heat gun burn the mobo considering it is a pretty small chip and a heatgun usually has a large opening?

Title: Neeed Help Removing A Transistor
Post by: hanksemenec on January 26, 2007, 09:28:00 PM

desoldering braid

Use desoldering braid and a soldering iron, suck up the solder with it. Then with heat applied to each transitor leg lift the leg with tweezers.

Hank

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 26, 2007, 09:36:00 PM

no, i already got the legs of, but the whole bottom of the transistor is soldered to the board.

Title: Neeed Help Removing A Transistor
Post by: hanksemenec on January 26, 2007, 09:45:00 PM

Heat up the big tab and lift

Title: Neeed Help Removing A Transistor
Post by: RDC on January 26, 2007, 11:25:00 PM

You just need a little more heat to get that kinda part loose from the board. A heat gun is a bit much, the soldering iron you have may or may not cut it. If your soldering iron has a temperature control, crank it up a bit. If it doesn't then try this. Iit may sound odd or even wrong at first, but put a little bit of fresh solder on the tab of it and then just keep your soldering iron tip there until it gets the whole part hot enough and comes loose. The new solder and flux will help transfer the heat better and should heat it enough to break it loose. Don't go dumping a ton of it on there, that'll make it worse, just enough to make a decent "liquid joint" between your soldering iron tip and the part. Just keep it pressed against that tab and it should come right off.

Title: Neeed Help Removing A Transistor
Post by: RBJTech on January 27, 2007, 02:47:00 AM

.. the problem is with these components is that they are soldered to a backplane of copper which acts as a heatsink - exactly the opposite of what you want when you're trying to remove them !

A techique I use for this sort of component is to use two soldering irons (if you have them that is) - apply a secondary source of heat (use some fresh solder for the heat transfer as RDC suggests) close to the component and use your main iron at the other end.  The heat 'loss' will then be minimised, allowing you get enough heat to melt the solder and lift the component ....  (ps any old crappy Iron will do for the 2nd heat source..)

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 27, 2007, 07:40:00 AM

QUOTE(RBJTech @ Jan 27 2007, 04:18 AM)

.. the problem is with these components is that they are soldered to a backplane of copper which acts as a heatsink - exactly the opposite of what you want when you're trying to remove them !

A techique I use for this sort of component is to use two soldering irons (if you have them that is) - apply a secondary source of heat (use some fresh solder for the heat transfer as RDC suggests) close to the component and use your main iron at the other end.  The heat 'loss' will then be minimised, allowing you get enough heat to melt the solder and lift the component ....  (ps any old crappy Iron will do for the 2nd heat source..)

oo wait, what does the copper look like? because last night i was tugging at the black part of the transistor with some tweezers and i either got the transistor off or i broke the top half of it off.

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 27, 2007, 12:08:00 PM

i hate to double post but i really want to get this 360 working again, does anyone know if i either broke the transistor or it is the copper heatsink??

Title: Neeed Help Removing A Transistor
Post by: RDC on January 27, 2007, 12:38:00 PM

Without knowing what you're looking at it's pretty hard to tell you what you're looking at. Post up a pic. Copper looks like copper, that orangish part you see around the edges of the board. It all looks like that really, the green is just a masking to protect the traces. It's not a heatsink, it's just a larger copper plane that takes more heat to break the part loose from, since you have to get it hot enough as well for the solder to melt, so it "acts" sorta like a heatsink, as RBJTech pointed out already.

This post has been edited by RDC: Jan 27 2007, 10:06 PM

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 27, 2007, 12:44:00 PM

yea i think im going to get a heat gun and try that but when i remove the transistor should the little metal bar come out with the transistor as well?? well when i pulled out the chip im not sure if i just broke the top half off or what or if its the heatsink, i cant get pictures up right now, but its a copper square and its a little bit smaller than the actual transistor.

Title: Neeed Help Removing A Transistor
Post by: RDC on January 27, 2007, 02:09:00 PM

If the spot where the Transistor was is flat and silver (solder colored) then you removed it all. If you just broke the black plastic off the Transistor and left the metal tab behind you'd see it for sure. If you ripped up the copper plane there you'd see that for sure too, but it wouldn't be copper, it would be the board underneath it.

This post has been edited by RDC: Jan 27 2007, 10:12 PM

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 27, 2007, 02:53:00 PM

so i most likely just ripped to top half of the transistor off?

This post has been edited by mezmerize1: Jan 27 2007, 11:05 PM

Title: Neeed Help Removing A Transistor
Post by: mezmerize1 on January 27, 2007, 03:32:00 PM

ive been trying the method with two irons, how long should i keep it on there, because they have been on for about 5 minutes and the transistor wont come off. im using two 30 watt irons

EDIT: IT FINALLY CAME OFF!!! thanks alot RDC that two iron method worked well. thanks alot.

This post has been edited by mezmerize1: Jan 27 2007, 11:41 PM