Removed a EPROM Is this PCB Dead?

Discussion in 'General Electronics Chat' started by Sean-S13, Apr 10, 2016.

  1. Sean-S13

    Thread Starter New Member

    Apr 10, 2016
    5
    0
    I removed a EPROM from my PCB its a Car ECU. I have accidentally heated the pin hole to much and the solder has bridged 2 Pin holes together. Is this fixable or is it screwed?

    [​IMG]

    Thanks
    Sean
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,515
    2,369
    He's Dead Jim!

    That unusual, the ones I have changed have a socket?
    Max.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,431
    3,360
    That does not look like a solder bridge.
    If it is a bridge, get some solder wick and wick away the solder bridge.
     
    JWHassler and kubeek like this.
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    That looks like close but not connected by actual solder. Have you tried checking continuity between the two pins with the power off?
     
  5. Sean-S13

    Thread Starter New Member

    Apr 10, 2016
    5
    0
    Just tried to remove it with solder wick. looks almost the same will upload another img. Have not checked continuity yet as my multimeter is at my unit.

    [​IMG]
     
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,779
    1,103
    However, there does seem to be a stray solder blob next to a pin at the bottom centre of the pic.
     
  7. Sean-S13

    Thread Starter New Member

    Apr 10, 2016
    5
    0
    just cleaned all of the stray solder, will give it a test tomorrow and will update. thanks for input.
     
  8. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    You could do better at getting the solder out of that place, but looking at that tear shape it seems to me that the connection is intentional.
     
  9. ian field

    Distinguished Member

    Oct 27, 2012
    4,413
    782
    Doesn't look like a solder bridge to me either - I agree with the suggestion to use solder wick. That will clean it up and show any track that's under there.
     
  10. Sean-S13

    Thread Starter New Member

    Apr 10, 2016
    5
    0
    There is no tracks under there, Just the dark green part of the PCB but I think its burnt through the dark green part and connected the 2 pins together.
     
  11. SLK001

    Well-Known Member

    Nov 29, 2011
    812
    225
    Well, if all else fails, you can always call up the datasheet of the EPROM and see if these two pins are/can be connected.
     
  12. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    you should use flux and desoldering pump.

    Once you have several faults on such PCBs with thin tracks it becomes a nightmare.
    You can scratch of the green laquer and attach magnet wire but better try at a via.
    As thin as they are it will be a pain.

    Desoldering pump goes quite quick for DIL ICs if the PCB is plated through, almost impossible to remove. You can however cut off the IC first then carefully push out the remains. If there are more than 2 layers vias inside are damaged easily. But DIL IC PCBs dont often use multilayer.
     
  13. Sean-S13

    Thread Starter New Member

    Apr 10, 2016
    5
    0
    Thanks for the help everyone but I just cant stop getting continuity between the two pins. Think the PCB is screwed.
     
  14. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    The dark green layer is solder mask so only features such as pads get exposed for solder. If it gets removed so you get solder stuck to something below it there is probably metal there to begin with.

    If it is a true solder short with no metal below it should be relatively easy to clear. Heat one pin and the solder should flow there making a break. You can also try heating the area and banging the edge on your able to flick off excess solder.

    My preferred way is to use solder wick, braided copper that draws solder into the strands and away from your board.
     
  15. SLK001

    Well-Known Member

    Nov 29, 2011
    812
    225
    If you look at the enlarged photo of this area, you will NOT see any traces going to either pin. That usually means that the two pins are POWER pins - in this case, they are probably GROUND. Look on the other side of the board, too.

    Also, the mask around the area is smooth and symetric, leading me to believe that these two pins were always connected - especially if you have found metal between them.
     
Loading...