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19859 Posts in 1275 Topics by 5187 Members - Latest Member: charbuild July 05, 2022, 12:09:55 PM
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Breaktru Forum  |  eCigarette Forum  |  Battery  |  Topic: Charging circuit on iTaste MVP
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Author Topic: Charging circuit on iTaste MVP  (Read 12307 times)

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Offline Lee1111

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Charging circuit on iTaste MVP
« on: December 06, 2013, 02:02:37 AM »
I was given an iTaste MVP in non working condition. I replaced the stock battery with a 18650. I believe it will fit back in the case, too. It now functions normally (except the on/off switch - just read that's for the USB port to charge other devices), with the exception that the charging board doesn't seem to be working. It's been a very long time since I've put a multimeter on a board to test down to component level. I've taken a picture of the front and back. I'm hoping someone can tell me where to begin troubleshooting this.

I guess at a minimum, I'll end up putting the guts in a box mod where I can take the battery out to charge it. There's nothing wrong with the original case, so I'd very much like to get this working. Well, I am missing the buttons to work the up/down(?) tactile switches. I'm guessing I can find a work around for that though. Not entirely sure what those two buttons do, going to read the manual after I post this.


Please ignore my rusty soldering job  :facepalm:

« Last Edit: December 06, 2013, 02:11:59 AM by Lee1111 »

Online Breaktru

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Re: Charging circuit on iTaste MVP
« Reply #1 on: December 06, 2013, 10:23:30 AM »
It would be hard to trouble shoot the charging circuit without a schematic and part number. It can be a bad chip or bad associated part. Is there a part number on the chips at U1 and U2 ?

MANUAL

Do you know where and how the buttons are wired?

One more thing to check. The USB connector is a weak point in some charging problems. Examine the pin connections with a magnifier and see if you can notice a broken solder connection on the PCB board or maybe a crack or separation of the PCB trace.
« Last Edit: December 06, 2013, 11:05:24 AM by Breaktru »

Online elzakivis

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Re: Charging circuit on iTaste MVP
« Reply #2 on: December 06, 2013, 11:07:51 AM »
You may be right breaktru about the USB connector.
I found this that may help

http://www.youtube.com/watch?v=tnN9iBXm-Cw

Offline Lee1111

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Re: Charging circuit on iTaste MVP
« Reply #3 on: December 06, 2013, 02:09:55 PM »
Ok so u1 was extremely hard to read, evenw ith a magnifying glass and a LED flashlight. I believe it says

IP4Q56
1319

I'm not sure if the first letter is an i, T, or a one. Also in the 1319, I'm not 100% sure that is a 3. It could be a 6, 8,or 9.



On u2,it was mucheas ier. It says AL384

Offline Lee1111

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Re: Charging circuit on iTaste MVP
« Reply #4 on: December 06, 2013, 02:29:50 PM »
Here are the front and back of the other two boards

Online Breaktru

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Re: Charging circuit on iTaste MVP
« Reply #5 on: December 06, 2013, 04:42:02 PM »
Ok so u1 was extremely hard to read, evenw ith a magnifying glass and a LED flashlight. I believe it says

IP4Q56
1319

I'm not sure if the first letter is an i, T, or a one. Also in the 1319, I'm not 100% sure that is a 3. It could be a 6, 8,or 9.

On u2,it was mucheas ier. It says AL384

I can't find those numbers or a variation of those numbers anywhere.

I looked closely at the pins on the U1 chip and it looks like there is a cold or broken solder connection on pin 4. The other side of the board is where the USB +5v input is soldered to. Check it out w/ a magnifier.
Pin 1 is near the dot indentation on the chip and there is also a "1" written on the PCB next to pin 1.
« Last Edit: December 08, 2013, 06:15:21 AM by Breaktru »

Offline Lee1111

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Re: Charging circuit on iTaste MVP
« Reply #6 on: December 07, 2013, 10:35:48 PM »
Thanks BreakTru. I'll give it a look when I get time. I work weekends

Offline Lee1111

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Re: Charging circuit on iTaste MVP
« Reply #7 on: December 12, 2013, 02:01:24 AM »
Sorry haven't gotten to this yet. Kids are here this week. Hard to have my workspace cluttered when they're here. They actually expect to eat at the kitchen table, wtf.

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