Transistor on Circuit board

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xxup		#1 Posted : 11 November 2019 23:35:18(UTC) Retweet
Joined: 15/03/2003(UTC) Posts: 9,472 Location: Australia		I managed to blow a transistor on a circuit board while I was trying to diagnose a fault. It has 705 marked on the top. Any thoughts? There is another, similar looking one, with the marking AS3. The one in this image is not blown
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Purellum		#2 Posted : 12 November 2019 00:20:17(UTC) Retweet
Joined: 08/11/2005(UTC) Posts: 3,505 Location: Mullerup, 4200 Slagelse		Originally Posted by: xxup Any thoughts? What kind of thoughts are you looking for? You can get the "magic smoke replacement" thoughts or just the plain "why did you do that" thoughts Most likely, and just guessing here, this is the thoughts you're looking for: https://www.ebay.com/itm...705T-705TA-/192826962090 Or these: https://www.ebay.com/sch...kw=FCX705TA&_sacat=0 Per. P.S: Don't blow a fuse if I'm wrong
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3 users liked this useful post by Purellum		Bigdaddynz, Legless, Chook
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river6109		#3 Posted : 12 November 2019 01:34:22(UTC) Retweet
Joined: 22/01/2009(UTC) Posts: 14,720 Location: On 1965 Märklin Boulevard just around from Roco Square		Adrian if you make it quick I can put them onto my order, the cost is A$ 8.00 for 10 (FCX705TA), pay me later John
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Bigdaddynz		#4 Posted : 12 November 2019 02:24:57(UTC) Retweet
Joined: 17/09/2006(UTC) Posts: 18,665 Location: New Zealand		Originally Posted by: Purellum What kind of thoughts are you looking for? He's a West Islander, who knows what thoughts they have given they are inbred convicts!
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river6109		#5 Posted : 12 November 2019 03:05:51(UTC) Retweet
Joined: 22/01/2009(UTC) Posts: 14,720 Location: On 1965 Märklin Boulevard just around from Roco Square		Originally Posted by: Bigdaddynz Originally Posted by: Purellum What kind of thoughts are you looking for? He's a West Islander, who knows what thoughts they have given they are inbred convicts! Does this mean his convict number is 705 ?
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cookee_nz		#6 Posted : 12 November 2019 04:06:40(UTC) Retweet
Joined: 31/12/2010(UTC) Posts: 3,954 Location: Paremata, Wellington		Well, we all know what thought thought "Thought thought his feet were out of bed, so he got out to take a look" But I'm gonna go out on a limb here and guess that "Any thoughts" means..... 1: Is it likely this component has actually failed and just needs replacing by itself? 2: Is '705' the correct code to get a replacement or is there a more suitable or substitute component I should use? 3: Is this component able to be replaced without any special tools or expertise (other than normal careful soldering) 4: Anything else I should know? 5: I'm Australian, does that help?
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Bigdaddynz		#7 Posted : 12 November 2019 06:11:29(UTC) Retweet
Joined: 17/09/2006(UTC) Posts: 18,665 Location: New Zealand		Originally Posted by: cookee_nz 5: I'm Australian, does that help? He's Australian, you got that bit right but you're assuming he actually has a thought....
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river6109		#8 Posted : 12 November 2019 07:24:26(UTC) Retweet
Joined: 22/01/2009(UTC) Posts: 14,720 Location: On 1965 Märklin Boulevard just around from Roco Square		Originally Posted by: Bigdaddynz Originally Posted by: cookee_nz 5: I'm Australian, does that help? He's Australian, you got that bit right but you're assuming he actually has a thought.... has this been an after thought ? or was it thoughtless to inflict your thought onto others
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PJMärklin		#9 Posted : 12 November 2019 10:16:33(UTC) Retweet
Joined: 04/12/2013(UTC) Posts: 2,210 Location: Hobart, Australia		Originally Posted by: xxup I managed to blow a transistor on a circuit board while I was trying to diagnose a fault. It has 705 marked on the top. Any thoughts? ... but then ! ... Originally Posted by: Purellum What kind of thoughts are you looking for? You can get the "magic smoke replacement" thoughts or just the plain "why did you do that" thoughts ... Originally Posted by: Bigdaddynz He's a West Islander, who knows what thoughts they have given they are inbred convicts! Originally Posted by: cookee_nz Well, we all know what thought thought "Thought thought his feet were out of bed, so he got out to take a look" But I'm gonna go out on a limb here and guess that "Any thoughts" means..... 1: Is it likely this component has actually failed and just needs replacing by itself? 2: Is '705' the correct code to get a replacement or is there a more suitable or substitute component I should use? 3: Is this component able to be replaced without any special tools or expertise (other than normal careful soldering) 4: Anything else I should know? 5: I'm Australian, does that help? Originally Posted by: Bigdaddynz He's Australian, you got that bit right but you're assuming he actually has a thought.... Adrian, I think you are showing a remarkable and dignified restraint in not being drawn into a response to the riff-raff !!

2 users liked this useful post by PJMärklin		Bigdaddynz, dominator
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Purellum		#10 Posted : 12 November 2019 10:53:49(UTC) Retweet
Joined: 08/11/2005(UTC) Posts: 3,505 Location: Mullerup, 4200 Slagelse		Originally Posted by: PJMärklin Adrian, I think you are showing a remarkable and dignified restraint in not being drawn into a response to the riff-raff !! I think he's just working on his response right now, trying desperately to find a clever answer............. Per.
		If you can dream it, you can do it! I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

1 user liked this useful post by Purellum		Bigdaddynz
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cookee_nz		#11 Posted : 12 November 2019 11:42:41(UTC) Retweet
Joined: 31/12/2010(UTC) Posts: 3,954 Location: Paremata, Wellington		Originally Posted by: Purellum Originally Posted by: PJMärklin Adrian, I think you are showing a remarkable and dignified restraint in not being drawn into a response to the riff-raff !! I think he's just working on his response right now, trying desperately to find a clever answer............. Per. He'll be sitting elbows at the desk, head in his hands and a kindly voice says "Are you having issues?" "Yes Darling, Tons"
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Bigdaddynz		#12 Posted : 12 November 2019 11:45:08(UTC) Retweet
Joined: 17/09/2006(UTC) Posts: 18,665 Location: New Zealand		Most likely he's fallen asleep having quaffed a XXXX or two......(or three!)
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Purellum		#13 Posted : 12 November 2019 12:07:52(UTC) Retweet
Joined: 08/11/2005(UTC) Posts: 3,505 Location: Mullerup, 4200 Slagelse		Originally Posted by: cookee_nz "Yes Darling, Tons" U/R saw what you did there - my eyes Hertz........... Per.
		If you can dream it, you can do it! I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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river6109		#14 Posted : 12 November 2019 12:21:46(UTC) Retweet
Joined: 22/01/2009(UTC) Posts: 14,720 Location: On 1965 Märklin Boulevard just around from Roco Square		Adrian, unfortunately the offer has expired but I always could order it on a new order. John
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xxup		#15 Posted : 12 November 2019 13:55:03(UTC) Retweet
Joined: 15/03/2003(UTC) Posts: 9,472 Location: Australia		Been at work.. Got home a little over 20 mins ago.. So I missed John's kind offer.. As for the rest of you..
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2 users liked this useful post by xxup		DaleSchultz, PJMärklin
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Purellum		#16 Posted : 12 November 2019 14:15:22(UTC) Retweet
Joined: 08/11/2005(UTC) Posts: 3,505 Location: Mullerup, 4200 Slagelse		Originally Posted by: xxup As for the rest of you.. That's what you get for helping an Aussie I should've posted a long list of Märklin technical tips and wire-color PDFs instead of finding the right part for you Per. Not the slightest offended OR offensive
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David Dewar		#17 Posted : 12 November 2019 15:36:25(UTC) Retweet
Joined: 01/02/2004(UTC) Posts: 7,342 Location: Scotland		If the one on the image in the original post is OK why not just use that. Just a thought.
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xxup		#18 Posted : 13 November 2019 02:01:33(UTC) Retweet
Joined: 15/03/2003(UTC) Posts: 9,472 Location: Australia		There is more than one of these chips on the board. I used a photo of an undamaged one to identify the one I needed to replace.
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DTaylor91		#19 Posted : 13 November 2019 04:57:20(UTC) Retweet
Joined: 31/08/2007(UTC) Posts: 414 Location: Kennesaw, GA		Originally Posted by: xxup There is more than one of these chips on the board. I used a photo of an undamaged one to identify the one I needed to replace. May I ask how the dead one met its demise? As for unsoldering, with surface-mount electronics it is best to use a special hot-air soldering tool for this. It basically requires all four solder joints to be heated to liquid at the same time, then using something to "flick" or pull the component from the board. They do make special, tiny suction cup tools for this. Trying to remove it with a conventional soldering iron and unsoldering tools can easily damage the circuit board. Usually the solder pads will pull up with the component, and may pull up a bit of the traces as well. Not fun to repair, especially without a microscope. As for the number on the part, on most small surface-mount components, there is an abbreviated, or much abbreviated, part number (and sometimes none at all). You will need to be VERY sure of the part number you are ordering. If you think you have the correct, full part number, I suggest looking at its data sheet to verify the abbreviated number. The data sheet will tell you specifically how that part is marked. I hope it's not a MOSFET, because then you'll have static precautions to take as well. As for replacing and re-soldering the part, Try using small dabs of solder paste as opposed to conventional solder. It can be dome with conventional solder, but it is not fun, and risks more damage. Good luck!

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kiwiAlan		#20 Posted : 13 November 2019 15:42:56(UTC) Retweet
Joined: 23/07/2014(UTC) Posts: 8,107 Location: ENGLAND, Didcot		Originally Posted by: DTaylor91 Originally Posted by: xxup There is more than one of these chips on the board. I used a photo of an undamaged one to identify the one I needed to replace. May I ask how the dead one met its demise? And is it an MRR related item that you have damaged? Originally Posted by: DTaylor91 As for unsoldering, with surface-mount electronics it is best to use a special hot-air soldering tool for this. It basically requires all four solder joints to be heated to liquid at the same time, then using something to "flick" or pull the component from the board. They do make special, tiny suction cup tools for this. Trying to remove it with a conventional soldering iron and unsoldering tools can easily damage the circuit board. Usually the solder pads will pull up with the component, and may pull up a bit of the traces as well. Not fun to repair, especially without a microscope. I would agree with this. For a component like this you need either a pair of tweezers, ideally the 'normally closed tip' type or a vacuum component picker. Originally Posted by: DTaylor91 As for the number on the part, on most small surface-mount components, there is an abbreviated, or much abbreviated, part number (and sometimes none at all). You will need to be VERY sure of the part number you are ordering. If you think you have the correct, full part number, I suggest looking at its data sheet to verify the abbreviated number. The data sheet will tell you specifically how that part is marked. Again, I agree. Often the part marking has absolutely no relationship to the part number and the only way to get close to the correct part is to guess what it is likely to be and look up an appropriate data sheet to see if the marking of that part matches what you have for form. There are reverse lookup web sites but they are all rather incomplete in their listings. Originally Posted by: DTaylor91 I hope it's not a MOSFET, because then you'll have static precautions to take as well. Well that goes for any electronic part, not just mosfets, but junction transistors, diodes, and ICs, along with many passive components. Originally Posted by: DTaylor91 As for replacing and re-soldering the part, Try using small dabs of solder paste as opposed to conventional solder. It can be dome with conventional solder, but it is not fun, and risks more damage. Good luck! Again using a small hot air unit is good for this, although it can be easy to blow the component away.

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