Someone who can inspect/reflow a GPU

Discussion in 'Electronics & Electrics' started by sammy_b0i, May 3, 2020.

  1. GrandmasBoi

    GrandmasBoi Member

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    As a reference here is a random video I just found what looks like a proper way with proper equipment to reball I just scrolled through



    I don't have the equipment, (the station with ir thermometer etc) to remove the chip properly nor the stencils for big chips.

    I got a hand-held air station and stencils for mobile phone chips which you can all do with cheaper equipment because of the much smaller size, heat times etc

    So think of it as you can easily rebuild a motorbike engine at home in garage but for a car you need a workshop with a hoist etc.

    So I can't help on reballing. Reflowing yes like Merlin said put some decent no clean flux under the chip as much as possible and go around in circle motions for a minute or 2 with hot air. As diagnosis this is definately the way to go see if things improve, if they do then a reball will be needed down the road.

    So from here
    1. See how the card works as is
    2. Get the smd back on
    3. Try to clean more of the gunk if you dare, what I do is dip small pieces of tissue in iso and use really small tweezers to hold the wet tissue balls to scrub but under a microscope

    4. If the card with the smd attached back on, reflowed, cleaned with no other obvious physical defects still behaves the same then as Merlin said a cracked via or multilayer trace hidden under something is just too hard to find (throwing darts in the dark)

    If you were in Vic I could solder back the smd component for you given you still had it in 1 piece as for going further home schooling has pretty much put a freeze on all my hobbies
     
  2. merlin13

    merlin13 Member

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    Sorry, but Hell No - got away from those bastards with the random Bities as soon as I could...

    But if you get really desperate, can pass you over to a mate older than me who I think still can/does. Will actually be seeing him tomorrow so I can ask.

    But be aware he bites for dollars worse than EHT bites...


    Trap For Young Players there - try well over than that time scale, especially reworking that mongrel stuff called Lead Free. Unless you can carefully nudge the chip freely chip around on its pads. And even then give it some more biccy...

    The Big Trick with hot air reflowing BGA is not only bringing it and the board itself up to appropriate temperature The Right Way but bringing back down to ambient The Right Way as well, so you don;t end up with the same problem you're trying t ofix in the first place.
     
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  3. GrandmasBoi

    GrandmasBoi Member

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    Yeah all depends on your tools, temp, flow, nozzle, preheater or absence there isn't really a right or wrong universal recipe here. Everybody has their own perfected technique as long as the end result is good
     
  4. cvidler

    cvidler Member

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    And there it is. you've realised it's not economical to repair.

    this kind of diagnosis and repair work is a relatively rare and expensive (in terms of required equipment and time) skill, unless someone is very generous, it's going to cost you more than the card is worth to get it worked on - and even then it may not be fixable anyway and you'll still have to pay for their time and materials.

    it's why consumer electronics are throw away items, they're just not worth repair.
     
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  5. elvis

    elvis Old school old fool

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    Appreciate it if you could ask. More than happy to pay for people to take the risks I don't want to take. :)
     
  6. merlin13

    merlin13 Member

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    :thumbup:

    He'll be here in 20 mins...
     
  7. merlin13

    merlin13 Member

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    Well, that and the fact the Manufacturuer's won't release circuit diagrams and easy access to their custom parts/components.

    And thn there's their chronically ridiculous pricing on replacement boards/modules.

    Like, over $400 for a main board for a Name Brand 42" TV that you can buy new for not much more than that?...
     
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  8. merlin13

    merlin13 Member

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    Asked, and Ye Shall Receive...

    Zap us your details and what you need done, will pass them over.
     
  9. macsbeach98

    macsbeach98 Member

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    Ah I just came on hare and seen this nice to see Shane sprouting my name around.
    Merlin the TV repair trade died years ago TESA and Tetia closed their doors nearly 20 years ago.:)

    BGA rework dont worry about trying hot air tools too much heat runoff for that to have any chance of success with large chips there are large copper and ground planes under the chip sucking the heat away and if you do succeed it was probably an interconnect between the silicon and chip substrate that is now making connection again.

    You need a proper rework station for success I have a ACHI IR6500 station the board has to be heated to at least 170c from the backside under the chip with the bottom heater before the top heater comes on and ramps the chip up to 230c in about 4 stages then the solder will be fully molten and the chip will just lift off.
    Cleaning the pads on the board is the next trick using a normal 40 watt soldering iron station with a chisel or spade tip isnt much good if the solder braid is sticking out from under the iron and loses some heat as you go along it will stick to a pad and pull a trace off the board. I use a Hakko T12-1403 70 watt tip if you look up T12-1403 on fleabay you will see what they are like and I cut the solder braid just short of the width of the tip it usually takes 4 or 5 pieces of braid to clean up the pads of that size chip then its just cleanup and reball the chip and then put it back on.

    I havent got a GP102 stencil here I would have to order one.
     
    sammy_b0i likes this.
  10. OP
    OP
    sammy_b0i

    sammy_b0i Laugh it up, fuzzball!

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    macsbeach98 what would you charge to do that work? Clean it up properly, reattach the smd and reflow/ball? Plus anything else you find wrong with it?
     
  11. macsbeach98

    macsbeach98 Member

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    Money isnt a problem it would only be cheap.
    Just a note to everyone else I am not here to fix everyones video card or replace sockets as a business it just becomes too time consuming and faults can be very hard to find and I have other things going on in my life other than fixing problems at the moment.
    I will send you a PM.
     
    Last edited: May 10, 2020
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  12. OP
    OP
    sammy_b0i

    sammy_b0i Laugh it up, fuzzball!

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    Completely understandable. Depending on your circumstances, this pandemic either has you busier than you've ever been or more bored than you've ever been. Happy to talk via pm.
     
  13. goldpenis

    goldpenis Member

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    Please update the thread/keep us posted - as an ex BGA/surface mount specialist I've found the thread interesting and entertaining.

    I would offer too but I've loaned my equipment to a friend who is producing/developing some hardware and needed the kit for FPGA rework (I haven't touched any devices since completing some work for another OCAU member a few years ago).

    Hope it works out - sometimes (I've been guilty myself) we treat things with too much caution than what's required!
     
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