Jon Hughes
Member
I've just picked up 3 x Killer Instinct 2 boards. All are non-working. Two of the boards have the worst example of surface mounted soldering I've seen - wrong iron and wrong solder size, very messy. One of these boards displays pink and black horizontal lines - both lights on. The second board works fine (credits, sounds, moves) - but displays no images. The third board is dead, but very clean.
What I have noticed on all three boards is the number of poor solder joints on the large chip with the black heat sink containing a significant number of legs coming from the chip. Could this be the cause of all the evils (messy soldering aside)? There are at least 12 loose legs on the clean board with 6 off to the side and not aligning with the respective mounting position.
I have straightened these out now with a pin. Before I attempt any SM work can anyone let me know if all the legs on that chip are used. With the Jamma connector facing up, I notice there is a mount missing from the fourth leg in the bottom left corner of the chip, opposite L60. There is no mount beneath the leg to solder on to, but the mount is present on the other two boards - is this pin and mount actually used? I can't see any connections on first glance.
I'm very good at through hole soldering and de-soldering and have seen a few videos on how to surface mount solder. I have all the necessary preparation tools, etc. I'm going to attempt some SM soldering on a Williams T-unit donor board I have, with plenty of SMCs to ruin first. Can anyone recommend a good iron, tip and solder for this type of task or would it be cheaper and less frustrating to get someone else to have a look at them?
What I have noticed on all three boards is the number of poor solder joints on the large chip with the black heat sink containing a significant number of legs coming from the chip. Could this be the cause of all the evils (messy soldering aside)? There are at least 12 loose legs on the clean board with 6 off to the side and not aligning with the respective mounting position.
I have straightened these out now with a pin. Before I attempt any SM work can anyone let me know if all the legs on that chip are used. With the Jamma connector facing up, I notice there is a mount missing from the fourth leg in the bottom left corner of the chip, opposite L60. There is no mount beneath the leg to solder on to, but the mount is present on the other two boards - is this pin and mount actually used? I can't see any connections on first glance.
I'm very good at through hole soldering and de-soldering and have seen a few videos on how to surface mount solder. I have all the necessary preparation tools, etc. I'm going to attempt some SM soldering on a Williams T-unit donor board I have, with plenty of SMCs to ruin first. Can anyone recommend a good iron, tip and solder for this type of task or would it be cheaper and less frustrating to get someone else to have a look at them?
