Cpu fail

Modules Microcontroller Programmer - Experimenting Project
1

Hello,

I have VK8061 and it worked fine until today.
Now, when I connect to USB and start running program it shows the message: CPU FAIL.
The software recognizes the card (if I change adress jump it recognizes card 0 or card 1…)
Follow the check I made:
connected only power cable but the LD12 was OFF.
LDS 11 eand 12 never switch ON
LDS 13 - 20 was ON
optocoupler IC1 e IC2 are in the correct positions
the voltage on J2 is near 5V and also PIN 11 + 32 of IC6
the voltage on PIN 14 of IC6 is 2.3V
the voltage on PIN1 of IC6 is 5V
I have not checked crystal and C19 and C20
I replaced IC4 and IC5

I suppose CPU is broken.
Can you suggest other check?
Is it possible to buy CPU alone? If yes can I know how to buy?.
I am from Italy.
Thank you in advance

2

[quote]Is it possible to buy CPU alone?[/quote]Sorry, this is not possible. You have to send the defective part for inspection/exchange.

You can return the kit for inspection to your local Velleman dealer or to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium

3

I confused myself and I send for inspection only CPU.
Only now I have realized that I had to ship all kit.
Is it possible to send now the rest of kit?

4

[quote]Is it possible to send now the rest of kit?[/quote]Yes.
Alternatively you may first test with the replacement CPU.

5

I am quite sure that CPU is broken.
If you agree I wait for you analyze CPU already shipped and then we accord for final solution.

6

[quote]If you agree I wait for you analyze CPU already shipped and then we accord for final solution.[/quote]This is OK.

7

Hello,
I have received back CPU, thank you.
There were no comments.
I Have placed it again on board but the result is the same: CPU fail.
Can I send you all the board for check?

8

I’m sorry for the inconvenience.

[quote]Can I send you all the board for check?[/quote]Yes, you can.

9

Hello,
I have received back the card.
It works good now, thank you very much!
I should like to know what was the broken part.
Thank you very much again

10

Repair dept. informed us that there was a short on the PCB.
They also replaced main and USB processor.

11

I see.
Thank you very much for assistence. :slight_smile: