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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 GQ4X is Dead		  New Topic  Reply to Topic
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RedScorpion

Germany
14 Posts
Posted - 09/03/2015 :  15:04:40  Show Profile  Reply with Quote
Hi all,

i write some eproms and after this solder the eprom via socket on my pcb.

After this i want used it on my gq4x again and missed that the soldering has a bridge. So i think i have kill the epromer.

The green led is still amber, but the epromer will not recognized.

Any hints what i could do?!

thanks

red
Reply #1

ZLM

2945 Posts
Posted - 09/03/2015 :  21:18:42  Show Profile  Reply with Quote
If your programmer is not detected by Windows, then the programmer is damaged.
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Reply #2

RedScorpion

Germany
14 Posts
Posted - 09/03/2015 :  23:30:31  Show Profile  Reply with Quote
Hi,

thanks for your reply.

Is there no workaround to test the issue or find a solution=

What kind of chip is responsible for the detection? Could i test the diods or capacitors to find anything?

Thanks

red
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Reply #3

ZLM

2945 Posts
Posted - 09/04/2015 :  11:13:22  Show Profile  Reply with Quote
You can check the main USB chip U1 on programmer PCB. And the VCC on it.
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Reply #4

RedScorpion

Germany
14 Posts
Posted - 09/06/2015 :  15:32:46  Show Profile  Reply with Quote
Hi,

okay that could i do. Could you give me the name of the chip or say me which number the vcc pin is?

I would check the vcc of this chip? How high should the chip be?

thanks

red
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Reply #5

ZLM

2945 Posts
Posted - 09/07/2015 :  19:17:17  Show Profile  Reply with Quote
The chip is Cypress AN2131.
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Reply #6

RedScorpion

Germany
14 Posts
Posted - 09/10/2015 :  14:33:27  Show Profile  Reply with Quote
hi,

got a second gq4x from a friend and test the AN2131 chip. It seems he doesn't got any voltage. I checked it and the chip has 3,3~ V. My programmer has nothing, so which part could be damage??

Which parts a responsible to offer voltage for the chip?!


thanks

red
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Reply #7

RedScorpion

Germany
14 Posts
Posted - 09/12/2015 :  08:38:13  Show Profile  Reply with Quote
Hi again,

it seems the defective part is the U1D1 and U1D2 part. Could you advice which kind of part it is?!

Thanks

red
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Reply #8

ZLM

2945 Posts
Posted - 09/12/2015 :  09:06:21  Show Profile  Reply with Quote
Those are regular diodes. 1N4148 or equivalent.
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Reply #9

RedScorpion

Germany
14 Posts
Posted - 09/13/2015 :  02:01:22  Show Profile  Reply with Quote
Hi ZLM,

i could fix the voltage issue ro replace u1d2. Gq4x works fine!

thanks
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Reply #10

ZLM

2945 Posts
Posted - 09/15/2015 :  16:12:06  Show Profile  Reply with Quote
sure!
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