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

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

 

You can buy a new psu for £12 / $20 why bother!

 

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.

 

You can buy a new psu for £12 / $20 why bother!

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.

 

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.

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

 

digikey...TOP243Y
http://www.digikey.com/product-detail/en/TOP243Y/TOP243Y-ND/1007570

Ebay
http://www.ebay.co.uk/sch/i.html?_trksid=p3902.m570.l1313&_nkw=top243y&_sacat=0&_from=R40



Circuit diagram

http://www.google.co.uk/imgres?imgu...yKaUOjuFvCU0QXBxICwAw&ved=0CCsQ9QEwAg&dur=784

 

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.

 

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.

 

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

 

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.

 

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.