ic number not visible in (smps)

Discussion in 'General Electronics Chat' started by seekerofknowledge, Nov 6, 2012.

  1. seekerofknowledge

    Thread Starter New Member

    Nov 6, 2012
    4
    0
    Hi Friend/z

    I am new to this forum and i hope i will get some help to this problem.

    I have a computer power supply Compaq, Product of china, Series PDP 118.

    The problem is there is one broken ic in which the number is not visible to replace it so i want that number or equivalent one.

    here i will upload images of that power supply

    [​IMG]http://imageshack.us/photo/my-images/641/picture2oi.jpg/
    http://imageshack.us/photo/my-images/338/picture3hc.jpg/
    http://imageshack.us/photo/my-images/19/picture4pu.jpg/
    http://imageshack.us/photo/my-images/521/picture5jx.jpg/
    http://imageshack.us/photo/my-images/716/picture6pa.jpg/
    http://imageshack.us/photo/my-images/152/picture7hc.jpg/
    http://imageshack.us/photo/my-images/196/picture8gd.jpg/


    That ic is in primary section

    There is one more good similar ic the number of that ic is

    J242
    TOP243Y
    21041C

    IMAGE OF THAT GOOD IC IS http://imageshack.us/photo/my-images/19/picture4pu.jpg/


    THX IN ADVANCE

    [​IMG]
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,963
    743
    You can buy a new psu for £12 / $20 why bother!
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    Those numbers are likely to be for a custom IC that is not available in the open market. I can't assign any meaningful information to them. As Dave has mentioned they are probably not worth repairing.
     
  4. seekerofknowledge

    Thread Starter New Member

    Nov 6, 2012
    4
    0
    Sir in our city psu is not available, if it is available also i will buy and open it and see the number of that ic and repair the faulty one. because the customers prefer not to spend $20 for new one and they want to make it ready the old one.
     
  5. seekerofknowledge

    Thread Starter New Member

    Nov 6, 2012
    4
    0
    sir that type of smps is not available even the power connector is also different connector we cant connect other psu in that motherboard, i will try to upload image of that power connector.
    http://i48.tinypic.com/25ur4e8.jpg
    http://tinypic.com/view.php?pic=219z874&s=6
     
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,963
    743
  7. seekerofknowledge

    Thread Starter New Member

    Nov 6, 2012
    4
    0
    So the broken one and the good one are same numbers right sir?

    i.e. TOP243Y


    Ok so i will purchase one TOP243Y and inform you after powering on the smps.
     
  8. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    IMHO just replacing an IC in a failed SMPS is unlikely to resolve the problem. If you lack a deep understanding of the topology and operation including the magnetics then you are doomed to the continued toasting of parts.

    Also why are certain parts available to you but whole power supplies are not? Your story just doesn't seem to add up.
     
  9. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    I would also have checked every electrolyte capacitor. In worst case replace with a power supply that fit in housing and has the same or better rating. PC power supplies are quite similar
     
    Papabravo likes this.
  10. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    Good call on the capacitors. Watch the ESR of the replacement capacitors. this can be the difference between meeting requirements and going up in smoke.

    The cores in the inductors may be damaged from temperature or overcurrent. If the magnetics are not up to snuff the chips won't be able to fix that. You can try your hand at repair but I think you better get used to disappointment.
     
  11. timescope

    Member

    Dec 14, 2011
    298
    44
    I repaired a computer psu that used TOP244 for the 5v aux supply a few days ago. I had to replace : 6.2v zener diode, opto coupler NEC2561, BAV21 rectifier diode and a 1 ohm fusible resistor that was used as a fuse in the supply line.
    Check all the components connected to the damaged ic .

    Timescope.
     
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