Led blink once and LCD with a row of squares : help me

[tatankam]

Hallo.
I finished to solder 56input kit.

When I power up it,
I see tha the LED blink only once and in the LCD I have a row of squares without text.

What could I check?
Thanks.

Mario

[Synthex]

I see tha the LED blink only once

Atmega seems to work well.
Did you test with piezos ?
What about the USB ?

the LCD I have a row of squares without text.

Check LCD wires.

[tatankam]

I see tha the LED blink only once
Atmega seems to work well.
Did you test with piezos ?
What about the USB ?

I used the usb on the mainboard.
If I use the usb on the 32 input board it doesn't power up.
No I don't test with piezo.
Tomorrow I will try with it
But, is it right that led blink only once when I power up?

the LCD I have a row of squares without text.

Check LCD wires.[/quote]

I will check it.

[dmitri]

Are you sure that your LCD is blank and not in fact filled with underscore symbols in all positions?

[tatankam]

No, it isn't blank, I see a row of squares.

[dmitri]

No, it isn't blank, I see a row of squares.

I see, so it is an LCD problem. Then if you have read "MegaDrum FAQ. Read it before posting in this forum!" topic then you would have seen in there:

7. Having LCD problems? Read this topic.

[tatankam]

Hallo dmitri!

Now my MD works, I see only one square and the input answer.

Now the problem is:
when I connect to windows or Linux, MDisn't seen through USB what can I do?
Have I to change firmware?

Thanks.
Mario

[dmitri]

PIC MCU is responsible for USB communication. You gave very little information so I'm guessing you have an electrical problem with the PIC MCU or resistors/capacitors connected to it.

[tatankam]

When I connect USB,I see that windows said:
"USB not recognized"

So..what could I check on PIC MCU ?

Excuse me..

[dmitri]

Make sure PIC is programmed.
Check tracks going to PIC for shorts/breaks/bad soldering/excessive flux.
Make sure the PIC's crystal is 12MHz.