switchboard installation gone wrong? some help please! :(

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aha2940
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switchboard installation gone wrong? some help please! :(

Post by aha2940 » December 30th, 2018, 11:57 am

Hi

So, I got the PSIO, followed the guides for my board (PU-22, PS1 model 7501) but now the PS1 does not power on (I tried powering it on without cdrom and without the PSIO connected, just the PS1 by itself). It will very briefly light the green LED (like half a second) and then nothing. Any ideas what can I check? I already rechecked all the connections and they seem to be fine :(

Thanks for any pointers!

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Re: switchboard installation gone wrong? some help please! :(

Post by FBX » December 30th, 2018, 12:34 pm

See if the PSU board will stay green lit if you unplug it from the mother board before turning it on. If it does, you may have a short in your install.

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Re: switchboard installation gone wrong? some help please! :(

Post by aha2940 » December 30th, 2018, 1:00 pm

FBX wrote:
December 30th, 2018, 12:34 pm
See if the PSU board will stay green lit if you unplug it from the mother board before turning it on. If it does, you may have a short in your install.
Hey FirebrandX, thanks for the pointer. I did the test as you suggested, and the power supply turns on fine with the board disconnected, so it seems you are right: there's some short in my install. Question is: how can I start troubleshooting this? I do have a multimeter and know how to use it to measure continuity, resistance and voltages.

Thanks for your help, here's hoping nothing is fried (fingers crossed).

Edit: Started by checking continuity between all the solder points of my switchboard. None have continuity, except between PE and CE, with the PS1 board disconnected, PE and CE have continuity, is that normal?

Edit2: Just checked the schematics of the switchboard, it's normal for PE and CE to have continuity all the time.

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » December 30th, 2018, 4:46 pm

You've shorted something or fried a fuse.

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Re: switchboard installation gone wrong? some help please! :(

Post by FBX » December 30th, 2018, 6:07 pm

One thing to look for is if you're pinch-grounding lines to the board during re-assembly of the console. I know of one other person that asked me for help, and it turned out he had not paid attention to the grounding squares on the motherboard where the wires must stay clear of them. I also go the extra step of putting electrical tape over the switch board itself. I leave nothing to chance.

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Re: switchboard installation gone wrong? some help please! :(

Post by NRGDEAD » December 30th, 2018, 7:05 pm

FBX wrote:
December 30th, 2018, 6:07 pm
I also go the extra step of putting electrical tape over the switch board itself. I leave nothing to chance.
That is very good advice. I didn't do that but after reassembly, thought I should have.

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » December 30th, 2018, 7:20 pm

NRGDEAD wrote:
December 30th, 2018, 7:05 pm
FBX wrote:
December 30th, 2018, 6:07 pm
I also go the extra step of putting electrical tape over the switch board itself. I leave nothing to chance.
That is very good advice. I didn't do that but after reassembly, thought I should have.
There is good clearance so that's generally not needed :)

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Re: switchboard installation gone wrong? some help please! :(

Post by aha2940 » December 30th, 2018, 11:24 pm

Hey guys

Thanks for all of your replies, so, I've done some more troubleshooting and found something interesting: I disconnected ONLY the +3.3V cable from the switchboard and guess what? no more short. The PS1 does not work (because of the cut traces, I guess?) but now it gets power without issue (green LED is stable), so...I guess that means the switchboard is bad? maybe it got defective from factory? no idea, however I'm pretty relieved, I see a chance that the PS1 is not totally fried.

Edit: I do not think I shorted something, since I covered all the nearby connectors with electrical tape before soldering the difficult cables (the ones that go to the tiny vias) to avoid bridging them by accident, and I checked them all for continuity with their neighbors several times using multimeter. Same for the solder points in the parallel port. I can upload a pic of my job of course, however I do not have a macro lens, so regular cell phone pic it would be.

Thanks!!

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » December 31st, 2018, 12:33 am

Yeah, please upload a picture so we can see.

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Re: switchboard installation gone wrong? some help please! :(

Post by aha2940 » December 31st, 2018, 1:49 am

Here's the pic of my solder work. Notice the 3.3V cable disconnected:

Image

Thanks!

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » December 31st, 2018, 2:02 am

Check there are no shorts marked in the areas in red

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Re: switchboard installation gone wrong? some help please! :(

Post by NRGDEAD » December 31st, 2018, 2:06 am

I'm no expert: there seems to be a lot of flux residue all over the board. Can that be a problem? I read that this stuff is at least slightly conductive can cause problems.

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » December 31st, 2018, 2:47 am

NRGDEAD wrote:
December 31st, 2018, 2:06 am
I'm no expert: there seems to be a lot of flux residue all over the board. Can that be a problem? I read that this stuff is at least slightly conductive can cause problems.
Nah, flux wouldn't cause a direct short like this. It's something else.

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Re: switchboard installation gone wrong? some help please! :(

Post by aha2940 » December 31st, 2018, 3:24 am

Matt wrote:
December 31st, 2018, 2:02 am
Check there are no shorts marked in the areas in red

Image
Hey Matt, thanks for the help. I checked the solder joints you marked, and they both check fine, they are not making contact with anything else, do not have conductivity with any of the traces/vias near them, and seem to be OK. The cut trace also sems to be well cut (checked the trace begin and end points with the multimeter).
NRGDEAD wrote:
December 31st, 2018, 2:06 am
I'm no expert: there seems to be a lot of flux residue all over the board. Can that be a problem? I read that this stuff is at least slightly conductive can cause problems.
You are correct, the board has a lot of flux residue, however it has been that way since new (this is my childhood PS1, bought it new in 1999). Shoddy job from sony, but it has worked fine for almost 20 years.

Thanks!

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » December 31st, 2018, 3:54 pm

Hmm, what I will do is send you a replacement Switch Board. Please PM my your Order ID or email address so I can look your account up and send one off to you :)

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Re: switchboard installation gone wrong? some help please! :(

Post by aha2940 » January 1st, 2019, 1:01 am

Matt wrote:
December 31st, 2018, 3:54 pm
Hmm, what I will do is send you a replacement Switch Board. Please PM my your Order ID or email address so I can look your account up and send one off to you :)
Thanks Matt, PM sent.

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Re: switchboard installation gone wrong? some help please! :(

Post by solidcore » January 3rd, 2019, 7:42 am

Got a lot of solder going on between pins 4 and 6 of the io pins ? Or the picture just appears that way

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Re: switchboard installation gone wrong? some help please! :(

Post by aha2940 » January 3rd, 2019, 2:16 pm

solidcore wrote:
January 3rd, 2019, 7:42 am
Got a lot of solder going on between pins 4 and 6 of the io pins ? Or the picture just appears that way
Maybe a bit too much, however no pins are shorting each other.

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Re: switchboard installation gone wrong? some help please! :(

Post by solidcore » January 9th, 2019, 6:11 am

aha2940 wrote:
January 3rd, 2019, 2:16 pm
solidcore wrote:
January 3rd, 2019, 7:42 am
Got a lot of solder going on between pins 4 and 6 of the io pins ? Or the picture just appears that way
Maybe a bit too much, however no pins are shorting each other.

Fair enough .

Where are you located ? Perhaps someone can take a look at your ps1 switch board installation in person ?

Also with a multi meter measure the voltage of the pin where the 3v3 is and see what comes up?

Secondly check for short by testing continuity between ground and 3v3 pads on your switch board in case there has been a manufacturing issue on the pcb front . you should not get a beep / continuity reading from your meter .

If you have had to cut traces you are going to need a jewlers lens or microscope to confirm the trace is cut and isn’t shorting on any ground planes nearby . Alternatively use your multi meter to ensure severed trace between the pads , no beep or continuity is expected to ground or between the pads .

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Re: switchboard installation gone wrong? some help please! :(

Post by Matt » January 9th, 2019, 1:54 pm

Probably best to send your board into us and we'll take care of it for you. Just purchase a 'Mainboard Modification Service' and send it over.

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