Author Topic: JDM-001 doesn't connect via USB, but okay via BT  (Read 683 times)

Offline ZhenyaKa

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JDM-001 doesn't connect via USB, but okay via BT
« on: October 20, 2020, 03:26:26 AM »
When connected - no reaction in Win7
But succefully connected to Android via BT.

Battery doesn't charges. Leaks about 0.001V per second

At PCB find a little heating chip R32CF near battery socket. It heating when USB switched. Temp about 3-4 degrees higher than PCB.

Without USB connection all cold.

What is this? Is it the same like M324P at JDM-020?

Can't find any info about it in Internet :(

« Last Edit: October 20, 2020, 03:27:24 AM by ZhenyaKa »

Offline RDC

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Re: JDM-001 doesn't connect via USB, but okay via BT
« Reply #1 on: October 20, 2020, 02:10:08 PM »
It's a 3.2v Regulator, same as the one that is just above it in you picture there.
Screwing up is one of the best learning tools, so long as the only thing you're not learning is how to screw up.

Offline ZhenyaKa

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Re: JDM-001 doesn't connect via USB, but okay via BT
« Reply #2 on: October 20, 2020, 11:02:05 PM »
It's a 3.2v Regulator, same as the one that is just above it in you picture there.

M324P at JDM-020 isn't the same?

If I'll replace it with 3.3v regulator like AMS1117-3.3V will it work? :)

As I undestand it is linear, not PWM regulator.

Offline RDC

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Re: JDM-001 doesn't connect via USB, but okay via BT
« Reply #3 on: October 21, 2020, 03:36:55 AM »
Never said it wasn't the same, since technically it's not or they would have the same part numbers. ;) But it's the same style 3.2v, SOT23-5 package Regulator and it should work in there fine. If you are going to get a new Reg, make sure it's 3.2v one.

Yes it's just some LDO, VLDO or ULDO type Linear Reg, nothing PWM going on with it.
Screwing up is one of the best learning tools, so long as the only thing you're not learning is how to screw up.

 

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