nashou
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Post by nashou on Feb 14, 2014 13:00:51 GMT -5
ok so I lifted the cap for IC 80 and all is good. I then went to lift the pin for it but some how lifted pin 8 on IC83 instead. So I i measured that and VCC was fine. I then went to remove C808.Here I noticed that pin 3 shorts to GND as does pin 7 with C808 removed and pin 8 lifted  . So I guess id have to lift pin 7 and 3 as well to be sure its not that IC since they are tied to VCC pad and touching that pad shows a short meaning the short is somewhere else ?? EDIT: I need a pointier Blade to lift IC80 pin and some others I guess. I should just remove them entirely with the hot air station and test off the board. Nashou |
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Post by mastertech on Feb 14, 2014 15:04:00 GMT -5
For that ic I would remove it completely. It's easier.
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nashou
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Post by nashou on Feb 14, 2014 16:03:14 GMT -5
For that ic I would remove it completely. It's easier. I agree, the super small ones I'll use the hot air wand. and i dont think I want to remove any more of those caps. A mm long and 1/4mm wide!!! Trying to put them back is beeeeeaaaaauch!!  At work till about 8 might get back at it when I return home. Should I leave all the parts off I remove till we find the short? Athanasios |
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Post by mastertech on Feb 14, 2014 16:08:32 GMT -5
Yes, I would not put anything back in. Actually if it ends up being something that is repairable you will more then likely have to order a part so I usually just order new parts for all those little caps and what not and replace them anyways.
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nashou
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Post by nashou on Feb 14, 2014 17:36:16 GMT -5
Yes, I would not put anything back in. Actually if it ends up being something that is repairable you will more then likely have to order a part so I usually just order new parts for all those little caps and what not and replace them anyways. Ok so go with removing the smaller IC's I can not lift the VCC pins on and remove all Caps and just order new one once We find the part causing the short. Athanasios |
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nashou
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Post by nashou on Feb 16, 2014 18:33:38 GMT -5
Removed some more caps. had a bad thing happen , tore the pad of C863 for IC81 that pad went to pin 14 VDCO which the cap was between pin 16 VDC1. both pins short to GND.
Not sure if I should proceed anymore? Do those pins do anything internally, that is connect?
Oh and the cap measured fine at 4.2uf
nashou
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Post by mastertech on Feb 16, 2014 18:36:59 GMT -5
Don't worry about it, just continue. Everything is fixable.
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Post by mastertech on Feb 16, 2014 18:40:38 GMT -5
I think you just need to lift the 5 pins for 3.3m to ic81 and see what you got to know if that ic is bad or not.
Put a little flux on the tip of the iron if you have any. It helps with the higher temp solder.
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nashou
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Post by nashou on Feb 17, 2014 17:09:40 GMT -5
I ordered the Chip Quik and will remove the entire chip I think, and all chips on that circuit. Then We'll get to the bottom of this!!
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nashou
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Post by nashou on Feb 19, 2014 21:49:57 GMT -5
Set up the station. The board is a bit too large for the PCB holder arms but I'll re work them so I can use them on larger boards. I will read the manual a bit but I think I like this so far. I pre heated the board a bit but not sure what the Temp is set to Fº or Cº.  |
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Post by mastertech on Feb 19, 2014 21:59:17 GMT -5
Cool! Are there adapters for the hot air gun?
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nashou
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Post by nashou on Feb 19, 2014 22:26:38 GMT -5
Cool! Are there adapters for the hot air gun? Yes but there are so many more you can get. Like wide dispersing ones for the really large BGA's.  Athanasios |
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nashou
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Post by nashou on Feb 22, 2014 19:52:08 GMT -5
Ok I decided to remove IC81 with the pre heater and Chip Quik. It came off fairly easy but I stll managed to pull off three pads  but now I have no short from what I can tell. So looks like it is fried but on the schematics it says not available. Nashou |
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Post by mastertech on Feb 22, 2014 20:21:41 GMT -5
What a shame. Looks like the only way out is to replace the whole board. It is still available but it is around 200 bucks. I am surprised how often the processor is blown on Yamahas.
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nashou
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Post by nashou on Feb 22, 2014 20:24:46 GMT -5
Ok Digikey and Arrow have it but does this chip need to be programed? It looks like a flash type not rom from the part number.
But its 20 + dollars and not stocked. 12 week lead time.
Nashou
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. So I guess id have to lift pin 7 and 3 as well to be sure its not that IC since they are tied to VCC pad and touching that pad shows a short meaning the short is somewhere else ??
but now I have no short from what I can tell.
