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Author Topic: Touchpad(JDM-030) with short circuit  (Read 1431 times)

Offline LSL

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Touchpad(JDM-030) with short circuit
« on: November 11, 2019, 06:51:34 AM »
Hi!

This JDM-030 doesn't sync and doesn't recharge. I found 2 capacitors with short (C1 and C2).

Could you help me with the values of them? The touchpad works without these capacitors, but I want replace them.



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Offline RDC

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Re: Touchpad(JDM-030) with short circuit
« Reply #1 on: November 12, 2019, 06:42:40 AM »
I took a couple JDM-030 apart here, as well as a couple other versions, and none of them had that version TP board in it, so I can't get you the exact values, but I doubt they are anything more than a couple of decoupling caps. I'd just put something like a 1uf and an 0.1uF in there.
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Offline LSL

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Re: Touchpad(JDM-030) with short circuit
« Reply #2 on: November 12, 2019, 07:07:36 AM »
Thanks RDC!

So should I put 1.1uf (1uf+0.1uf)?

I will search for the IC datasheet to make sure the other capacitors (C3 and C4) have equal values.
« Last Edit: November 12, 2019, 07:09:20 AM by LSL »
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Offline RDC

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Re: Touchpad(JDM-030) with short circuit
« Reply #3 on: November 12, 2019, 07:25:31 AM »
If the chip is the MXT112, good luck finding the DS. If it's something else please let me know, as all the TP boards I have hare use the MXT112 chip.

Correct, 1.1uF total, but anything at all would really work from 1nF to 10uF if it's just for some decoupling. I doubt they are doing anything else, as it would mess with the TP with them missing.
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Offline LSL

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Re: Touchpad(JDM-030) with short circuit
« Reply #4 on: November 12, 2019, 07:52:31 AM »
I guess isnt MXT112 chip because it's has a different package from another TP IC comparing with JDM-040's TP.

Soon I will telling you if this chip is a MXT112 or not, probably tomorrow.

Thanks!
« Last Edit: November 12, 2019, 08:01:56 AM by LSL »
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Offline LSL

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Re: Touchpad(JDM-030) with short circuit
« Reply #5 on: November 13, 2019, 08:26:01 AM »
It is a mXT112S.  :cry2:


I found 2 datasheets: mXT144U and mXT224.

On mXT224's datasheet, pages 7 and 8, shows an association with 100nF and 1uF, the same you said yesterday.

On mXT144U's datasheet, page 9, shows 2 associations: 22nF + 2.2uF and 22nF + 1uF.

I will remove C3 and C4 capacitors to check respectives values and compare them with the datasheets.
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Offline LSL

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Re: Touchpad(JDM-030) with short circuit
« Reply #6 on: November 14, 2019, 07:07:23 PM »
C3 = 100nf
C4 = 1.5uF

I will put same values to C1 and C2.
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Offline LSL

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Re: Touchpad(JDM-030) with short circuit
« Reply #7 on: December 16, 2019, 10:19:47 AM »
The same problem, same board, same TP:

https://youtu.be/ICn3RPxeQYU?t=559
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