Broken Trace

[davg]

Hi guys I was replacing the start up caps on this board and I pulled the copper trace on the 1uf @50 volts. The other two 22uf @50 volts were ok I know some of you have repaired broken traces but this is so small I can't see where the circuit leads. My question is how are these three caps connected in the circuit? Can I use a jumper to the leg with the broken trace?

[ben7]

Re: Broken Trace

Hi guys I was replacing the start up caps on this board and I pulled the copper trace on the 1uf @50 volts. The other two 22uf @50 volts were ok I know some of you have repaired broken traces but this is so small I can't see where the circuit leads. My question is how are these three caps connected in the circuit? Can I use a jumper to the leg with the broken trace?

Keep the lead of the new cap long, and bend it over and solder it to that resistor, then trim off the excess lead



-Ben

[Ritalin]

Re: Broken Trace

What Ben said, or take a exacto knife and scrap away some of the board near the lead to expose the trace and then soldier over it.

[davg]

Re: Broken Trace

Thanks guys I did as ben7 suggested as shown in the photo. This board was not powering up no led but I did have 5volt and 12 volt to the logic connector and 169 volts on the large cap.I replaced these three caps because they were the only ones that were not replaced and now I don't have any voltage to the logic connector but still have 169 volts on the large cap. Did I loose the voltage because of the broken trace?

[Jasgriff]

Re: Broken Trace

We need 2 new clear pictures of or the board after you have fitted the caps so that we can see whats going on and offer advice on what to test.

[davg]

Re: Broken Trace

We need 2 new clear pictures of or the board after you have fitted the caps so that we can see whats going on and offer advice on what to test.

Thanks Jasgriff here are some closeups.

[Jasgriff]

Re: Broken Trace

Hi, looking at you very first picture on the bottom of the power board before you changed the capictor it should not have been connected to that reistor. There doesnt seem to be a trace going to it at all. I think thix is where you issue is.

[davg]

Re: Broken Trace

Thanks looks to me it may go to U101? Is that doable?

[popeye]

Re: Broken Trace

looking at your pictures that leg of that copy does not go to that resister if you get a strong light and look at a cleaned up pcb you should be able to see where it should go witch I think is to D106 looking at D106 from the top of the board it looks like D106 may be faulty and also I would be checking most of the silicon around that area and check all the caps around there.


popeye

[ben7]

Re: Broken Trace

looking at your pictures that leg of that copy does not go to that resister if you get a strong light and look at a cleaned up pcb you should be able to see where it should go witch I think is to D106 looking at D106 from the top of the board it looks like D106 may be faulty and also I would be checking most of the silicon around that area and check all the caps around there.


popeye

Ahhh, my mistake!

I wasn't sure what pad was broken, b/c it wasn't marked.

[Jasgriff]

Re: Broken Trace

If the trace goes to the pin of the IC then it is definately do able. Make sure it definately does before soldering though.

[retiredcaps]

Re: Broken Trace

if you get a strong light and look at a cleaned up pcb you should be able to see where it should go

I hold a board up to the sun so it shines behind the board and then take a photo of it. It works great for some boards.

[davg]

Re: Broken Trace

I hold a board up to the sun so it shines behind the board and then take a photo of it. It works great for some boards.

Thanks retirecaps I tried looking through it with a bright light (Photograph lamp) but cannot see where that trace goes. I though it went to the IC U101 as indicated early and I ran a wire to it no change still no voltage to the logic connector. Is there a schematic somewhere around for this board? Its a XP-04804-A

[budm]

Re: Broken Trace

I look at the picture, since that leg of the cap is negative, then it should go to ground of the primary side, see the picture.
What is the P/N of that IC, it looks like pin 2? is connected to ground also. need IC spec to find out. It also looks like there is a connected trace to the right of the PAD also.

[davg]

Re: Broken Trace

I look at the picture, since that leg of the cap is negative, then it should go to ground of the primary side, see the picture.
What is the P/N of that IC, it looks like pin 2? is connected to ground also. need IC spec to find out. It also looks like there is a connected trace to the right of the PAD also.

Thanks budm I can't read the p/n on the IC The top # looks like EA530A but I can't be sure I am looking through a lighted magnifiying glass still too small to read. That line you indicated is a trace and I have since soldered the negative leg to that point but the difference is the same no voltage to the logic pin?

[budm]

Re: Broken Trace

So right now the negative leg of that cap and the trace that I indicate are new all connected to the ground trace?

[davg]

Re: Broken Trace

So right now the negative leg of that cap and the trace that I indicate are new all connected to the ground trace?

So I thought but it would seem I am not getting a good connection at that trace. Can I run a jumper to one of thes negative points and get the same results? I do I have to attach it to the proper trace?

[budm]

Re: Broken Trace

"Can I run a jumper to one of thes negative points and get the same results"
Do you mean that you have already jump the negative leg of the cap and the trace to the ground trace as shown in my picture and it still does not work?
I will look tomorrow to see if I have the same board laying around in my part bins.

[davg]

Re: Broken Trace

"Can I run a jumper to one of thes negative points and get the same results"
Do you mean that you have already jump the negative leg of the cap and the trace to the ground trace as shown in my picture and it still does not work?
I will look tomorrow to see if I have the same board laying around in my part bins.

Thanks budm I appreciate it. I tried soldering the negative leg of the cap to that trace only but as I indicated I am not getting a connection. So should I connect the negative of that cap to a negative trace and also that broken trace to a negative trace?

[budm]

Re: Broken Trace

Can I see that section of the trace that I have readlined to verify, the picture you posted was not clear enough. I still have to look up the spec of the IC. You can connect the negative leg of the cap, but not the trace until I can see the picture clearly, but I believe that broken trace is the ground trace.
So far no luck with that IC EA530 P/N search.
By the way, what is the make and model of this monitor?