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Author Topic: Capacitor values on a 1697 controller  (Read 4840 times)

Offline irvgotti452

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Capacitor values on a 1697 controller
« on: February 28, 2018, 08:08:44 AM »
Hey guys, long time lurker first time poster.

So I have this controller that flashes 2x with batteries connected and nothing else. When USB is connected nothing happens at all. I wasn't the original owner of this controller but I am definitely down for the task of repairing it.

I was poking around and noticed the following capacitors were shorted to ground:
MODEL: 1697
PCB: X902914-005
C6, C7, C8, C9, C13, C21, C36, C37.

Any idea's on the values so that I can order some replacements?
Also, should I be checking any other components on the board?
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Offline RDC

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Re: Capacitor values on a 1697 controller
« Reply #1 on: February 28, 2018, 05:07:49 PM »
Have you removed every one of those and confirmed they are shorted? Because if you are only testing them on the board, and all of them are in parallel on there, then odds are only 1 of them is actually shorted.
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Offline irvgotti452

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Re: Capacitor values on a 1697 controller
« Reply #2 on: February 28, 2018, 05:36:16 PM »
Quote from: RDC on February 28, 2018, 05:07:49 PM
Have you removed every one of those and confirmed they are shorted? Because if you are only testing them on the board, and all of them are in parallel on there, then odds are only 1 of them is actually shorted.

Thanks for the reply. I tested it against a working board. None of the working board ones are shorted. Any other tests you think I should run?

Edit: Oh I see what you're saying. I will check and report back.
« Last Edit: February 28, 2018, 05:37:25 PM by irvgotti452 »
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Offline RDC

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Re: Capacitor values on a 1697 controller
« Reply #3 on: February 28, 2018, 05:43:29 PM »
That's not the correct way to test them. If even 2 of them are in parallel and only 1 of them is bad then both of them will test bad because they are connected together.

You need to remove the suspected shorted caps and test them off the board. You'll most likely find that only 1 of them is bad, or none of them are and something else is causing the short on that rail, probably U1.

« Last Edit: February 28, 2018, 05:44:37 PM by RDC »
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Offline irvgotti452

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Re: Capacitor values on a 1697 controller
« Reply #4 on: February 28, 2018, 06:48:18 PM »
Oh yea of course, i just did that as a point of reference. Now i removed every cap that was shorted to ground and every one of them were good. Interestingly enough there was still a short when testing just the pads themselves. Think U1 could be the culprit? Also if so, are there any direct replacements?
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Offline RDC

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Re: Capacitor values on a 1697 controller
« Reply #5 on: February 28, 2018, 06:56:13 PM »
If the short at C6/C7 is still there then I'd suspect U1 is bad, since C6/C7 are on the 5v rail, which is the input of U1, then pretty much every other cap you checked are on the output of it.

U1 is an MP2161, but I'd pull it and make sure the shorts go away first.
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Offline irvgotti452

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Re: Capacitor values on a 1697 controller
« Reply #6 on: February 28, 2018, 08:54:45 PM »
Thanks a lot RDC I'll check when I get home and report my findings.
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Offline irvgotti452

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Re: Capacitor values on a 1697 controller
« Reply #7 on: March 01, 2018, 10:06:00 PM »
Quote from: RDC on February 28, 2018, 06:56:13 PM
If the short at C6/C7 is still there then I'd suspect U1 is bad, since C6/C7 are on the 5v rail, which is the input of U1, then pretty much every other cap you checked are on the output of it.

U1 is an MP2161, but I'd pull it and make sure the shorts go away first.

That was it bro. I got the part off of a completely broken controller and it works fine. You are the man.

Since U1 went should I worry about any other parts?
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Offline RDC

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Re: Capacitor values on a 1697 controller
« Reply #8 on: March 01, 2018, 10:28:23 PM »
U1 just knocks the 5v from the USB down for the other 2 converters to use instead of the battery power while it is being charged. If everything is working then I wouldn't go looking for anything else.
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Offline irvgotti452

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Re: Capacitor values on a 1697 controller
« Reply #9 on: March 03, 2018, 12:16:24 AM »
Thanks again. That's interesting also.
Any idea why it wouldn't work with batteries and just gave off 2 light blinks on the X? U1 behavior?
« Last Edit: March 03, 2018, 12:43:39 AM by irvgotti452 »
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Offline RDC

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Re: Capacitor values on a 1697 controller
« Reply #10 on: March 03, 2018, 12:25:03 AM »
The U1 output was shorted, which is basically the battery power when run from the pack, so it really just powered up long enough to cut itself off.
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Offline irvgotti452

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Re: Capacitor values on a 1697 controller
« Reply #11 on: March 03, 2018, 12:45:34 AM »
Ah failsafe. Pretty cool. Thanks again. I'll be posting other weird problems later lol.
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