Anything i can do with this point ?

[loady]

The picture below is the back of my J1D2 point, i want to solder my NAND x to..when i was cleaning it up after removing all the LPT and jtag wiring the solder braid stuck fast to it...the picture is the result..i think it may be shorting..would it be a good idea to cut the board where i have drawn the line in an effort to isolate it ?

 

[Martin C]

you shouldn't need to.

You need

desoldering braid
flux (plenty of it)
a hot iron.

Put some flux on the spot and braid.
place the braid on the spot.
put the iron on the braid.

Leave it there for about 3-5 seconds and lift.

It should take it away for you.

EDIT: The top point above where you've 'scored is joined to the entire green masked area underneath it. The point below where you've scored is the only thing which would need to be isolated.

 

[loady]

Ok..ill give it another whirl, i dont want to damage it anymore..it seems that some material has lifted and its hard to see the speration between the two points..

When you say hot iron, im never really sure of correct temps, for this purpose i use it at 380

EDIT: i completley flooded it with flux, braid stuck again but i got it off..it looks as though where the copper underneath the green has gotten exposed its got tinned..now its a bit cleaner i can define a very thin area between the two..i may just go ahead now and solder the part on

 

[Martin C]

If braid gets stuck, apply a little solder to the top side of it. Never pull it off.

 

[loady]

ok, i removed all the pin headers that i had previously soldered, on the jtag point J2D2 pin 7, the hole will not take solder top side where i need to solder the NAND x header for the jtag, there is however solder on the other side of the board and inside the hole on the same point..does contact for this point traverse through the board or is it top side only ?..what im thinking is that i can sink a pinheader through it for the jtag point to solder to, so infact the solder on the point on reverse side will be its contact..hope that makes sense

 

[Martin C]

It bothers me that you've got a situation where the solder won't 'take'. This is either the point is dirty (use rubbing alcohol to clean, then flux), the iron is dirty (clean the tip!), the solder is naff or the iron isn't hot enough. 350c should be more than enough heat for these points.

 

[loady]

it kinda looks burnt to be honest..solder is lead, flux is no clean, tip is good as it solders perfectly well elsewhere.. as you can see from the pic below...it the is solder IN the hole and on the reverse side, there just seem to be no copper and it doesnt well up and set like the others..is this going to be a problem..im beginng to think that the pad is gone as with this magnification i can see the trace on the board but i dont see how it is making contact with the solder INSIDE the hole

EDIT: cleaned it up with alcohol and im pretty sure the copper ring is gone !...what about my sinking the pin through theory ??worth it or have i totally fekked this point ?

 

[Martin C]

J2D2.7 trace is gone. You can repair it though:

http://www.team-xecuter.com/forums/showthread.php?t=55120