GQ-4X programmer USB not recognised

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GQ-4X programmer USB not recognised

Postby VX L67 Getrag » Wed Mar 04, 2020 10:23 am

I was just wondering if anyone else has had a GQ-4X programmer work fine for years & then all of a sudden while in use it drop out of sync with PC & then USB not get recognised when plugging into ANY pc?

I’m guessing there’s something on the circuit board that has stopped working but visually I can’t see anything obvious...
5D5B0F41-3FF0-44C7-87B8-17C7E12D3701.jpeg

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Re: GQ-4X programmer USB not recognised

Postby Tazzi » Wed Mar 04, 2020 10:57 am

have you tried using the power socket? maybe the 5v line has died from the usb somehow?
Image

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Re: GQ-4X programmer USB not recognised

Postby VX L67 Getrag » Wed Mar 04, 2020 5:20 pm

Yeah that was the first thing I tried, but it didn't help... once I get it fixed I think I'll make sure I use the power supply with it when using to save any future issues!

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Re: GQ-4X programmer USB not recognised

Postby Tazzi » Wed Mar 04, 2020 5:26 pm

VX L67 Getrag wrote:Yeah that was the first thing I tried, but it didn't help... once I get it fixed I think I'll make sure I use the power supply with it when using to save any future issues!


Can you throw a multimeter on that top regulator in that picture? Looks like a 5v reg or something along those lines.. lets see if its outputting what it suppose to.

We can check its pinout first too if you grab the part number on it which I cant quite make out.
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Re: GQ-4X programmer USB not recognised

Postby VX L67 Getrag » Wed Mar 04, 2020 5:29 pm

I'll test it out tomorrow, thanks for the info!

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Re: GQ-4X programmer USB not recognised

Postby picvrss » Wed Mar 04, 2020 10:25 pm

Looks like it’s a standard 5-volt 3-terminal regulator, L7805CV - I use these.
Pinout across face is In/Common/Out.

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Re: GQ-4X programmer USB not recognised

Postby Ken » Wed Mar 04, 2020 11:16 pm

VX L67 Getrag wrote:I was just wondering if anyone else has had a GQ-4X programmer work fine for years & then all of a sudden while in use it drop out of sync with PC & then USB not get recognised when plugging into ANY pc?


I had one given to me that was working fine, then suddenly stopped working / being detected when plugged in,
I posted the fix in this thread, my second post down.

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Re: GQ-4X programmer USB not recognised

Postby Charlescrown » Thu Mar 05, 2020 6:23 am

Mine started crashing and I think it ended up being a windows update. I did post on this forum some time ago. What I ended up doing was to run as administrator and it works great now.

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Re: GQ-4X programmer USB not recognised

Postby VX L67 Getrag » Thu Mar 05, 2020 7:42 am

That regulator with multimeter with middle to black of multimeter the closest to outer edge is 11v & closest to middle of pcb is 5v.

Each of those resistors at the end closest to USB connector only have 1.7v but I can’t see any obvious burnt tracks from USB cage to those resistors!

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