Dead Duo... Which ICs does the Hucard port communicate with?

[Sensato Black Lion]

I’ve got a dead Duo here and from what I understand, during the installation of a region switch (8PDT style),  some data pins on the switch accidentally touched the fuse and the system doesn’t work anymore. I need to find which IC could be damaged so I can repair this unit.

I believe that the 6260, 6270 and 6280 chips all are directly linked the the Hucard port but what other ICs are linked to the port?

I’ve got a few TG16 I can use for parts but if replacing most IC on the Duo board is required, I might as well forget about this and declare that system dead…
Can I resuscitate that system or is it a lost cause?

[burn_654]

Are you sure it's gone as far as the ic's?

During some troubleshooting with my region mod my Duo would turn on but with a white or other color screen. It turned out I needed to better insulate my switch (I just wrapped extra electrical tape) because it was shorting to ground against something.

Do you get any *blip* or solid color when you're turning it on?

[Sensato Black Lion]

I'm pretty sure that some ICs were damaged. Everything was working fine before the incident happened. The regions switches' pins (connected to the Hucard port) made contact with the 12V line (the fuse). The fuse did not even blow up.

I've tried replacing the 6260, 6270 and 6280 ICs but I wasn't successful in doing so. Note that I might have damaged the ICs from heat while desoldering them. Thankfully, the PCB doesn't look like it was damaged in the process. I used a butane gas torch to desolder the chips.

I'll try to post pics later.

I've put the system aside for over a year, and I think it's time I fix it.

[Bernie]

Get with thesteve here in the forums.  He usually has pretty good luck in helping folks trace problems like this.

[Sensato Black Lion]

Get with thesteve here in the forums.  He usually has pretty good luck in helping folks trace problems like this.

Thanks for the tip!

I was actually secretly hoping that thesteve would contribute to this thread if he felt he could be of any help. I wasn't really feeling like contacting him directly for help. I will wait a bit, think things over a bit more and pm him in a while.

[Sensato Black Lion]

I found this diagram while searching for what goes where in the PCE: http://nfggames.com/forum2/index.php?topic=4925.0

I do not know if it is 100% accurate but it will certainly be a great reference when trying to fix this and other PCE problems I have.

I have also noticed that the 5V line is shorted in my system. I think I will desolder one IC at a time to see which one is causing trouble.

[SignOfZeta]

I would refrain from using the torch.

[Sensato Black Lion]

I would refrain from using the torch.

Any bad experience with a torch? I must admit that I'd be afraid to destroy the quad flat package ICs (is this what they are called) like the Hu chips, with the torch. Same goes for the hot air gun. I don't know how much heat they can take before they die. I wish I had a desoldering station but I don't. I'll look for tips to desolder those...

It was thinking about desoldering SOP ICs that are close to the HuCard pins first and see if I can fins the culprit(s) there. These should be easy to remove.

[SignOfZeta]

I would just use a braid and an iron and go in stages. This will keep the heat a lot more localized.