All in one v2.8 kit help

[Synthex]

ICSP = In-Circuit Serial Programming
ISP = In-System Programming

It's the same thing.

But the two cables are different.
A cable for the Atmega and a cable for the 18F2550.

[Ken Forgettable]

Is anything connected to the inputs?
Power it up while holding the key RIGHT pressed. Still the same problem?

Please check your keyboard is connected as per the (latest) Synthex PCB v2.8 Quick Manual.pdf *V2* schematic.

[dmitri]

The reason that I think the Atmega might be dead is taht I behaved very badly this night. In my frustrations I think I did some soldering with the IC in the socket. Plus I may have fumbeled around with the board without caring for statics a little to mutch. Once AGAIN I have learned not to try and solve these kind of problems in the middle of the night. Will I ever learn?

If Atmega is misbehaving but USB is working, can you confirm that you stopped receiving any MIDI data in the software?
If MIDI data is still there, check this thread: viewtopic.php?f=3&t=492
It might be the LCD rather than Atmega.
For programming Atmega you need an ISP cable and an LPT port on a PC.

[hchriste]

The reason that I think the Atmega might be dead is taht I behaved very badly this night. In my frustrations I think I did some soldering with the IC in the socket. Plus I may have fumbeled around with the board without caring for statics a little to mutch. Once AGAIN I have learned not to try and solve these kind of problems in the middle of the night. Will I ever learn?

If Atmega is misbehaving but USB is working, can you confirm that you stopped receiving any MIDI data in the software?
If MIDI data is still there, check this thread: https://www.megadrum.info/forums/viewto ... ?f=3&t=492
It might be the LCD rather than Atmega.
For programming Atmega you need an ISP cable and an LPT port on a PC.

No there is no midi activity anymore.

Will the programming software accept an LPT to usb Adapter?

[dmitri]

Will the programming software accept an LPT to usb Adapter?

It should, but I didn't try it myself.

[hchriste]

OK so I checked the board again. And did measure ohm and V everywhere on the board. I actually found an error. For some reason I had fitted R2 with 100 ohm instead of 10k. Apart from that everything seems to be in perfect condition. Well if it was not for the nonresponding Atmega that is. I changed R2 to 10k, but if this error did some damage it is permanent because the Atmega still dos not respond.
Can you guys make a guess whether placing 100 ohm at R2 can do some fatal damage to other components?

[dmitri]

OK so I checked the board again. And did measure ohm and V everywhere on the board. I actually found an error. For some reason I had fitted R2 with 100 ohm instead of 10k. Apart from that everything seems to be in perfect condition. Well if it was not for the nonresponding Atmega that is. I changed R2 to 10k, but if this error did some damage it is permanent because the Atmega still dos not respond.
Can you guys make a guess whether placing 100 ohm at R2 can do some fatal damage to other components?

No, it would not damage it.
Btw, what crystal do you use for Atmega?

Can you try to take PIC18F2550 out of its socket and see if the LCD shows anything?
What are voltages on pins 10 and 30 of Atmega?
What are voltages on pins 11 and 31 of Atmega?
What are voltages on pins 1,2,3 of the LCD?

Did follow my advice from https://www.megadrum.info/forums/viewto ... ?f=3&t=492 starting from the second step?

[hchriste]

OK so I checked the board again. And did measure ohm and V everywhere on the board. I actually found an error. For some reason I had fitted R2 with 100 ohm instead of 10k. Apart from that everything seems to be in perfect condition. Well if it was not for the nonresponding Atmega that is. I changed R2 to 10k, but if this error did some damage it is permanent because the Atmega still dos not respond.
Can you guys make a guess whether placing 100 ohm at R2 can do some fatal damage to other components?

No, it would not damage it.
Btw, what crystal do you use for Atmega?

Can you try to take PIC18F2550 out of its socket and see if the LCD shows anything?
What are voltages on pins 10 and 30 of Atmega?
What are voltages on pins 11 and 31 of Atmega?
What are voltages on pins 1,2,3 of the LCD?

Did follow my advice from https://www.megadrum.info/forums/viewto ... ?f=3&t=492 starting from the second step?

Problem persists without the PIC.
Pins 10 and 30 of Atmega is 5 V (VCC)
pins 11 and 31 is 0V (GND)

Pin 1 of LCD is 0V (GND)
Pin 2 of LCD is 3.2 V
Pin 3 of LCD is 2.9 V

Yes I looked at your LCD thread.

[hchriste]

OK so I checked the board again. And did measure ohm and V everywhere on the board. I actually found an error. For some reason I had fitted R2 with 100 ohm instead of 10k. Apart from that everything seems to be in perfect condition. Well if it was not for the nonresponding Atmega that is. I changed R2 to 10k, but if this error did some damage it is permanent because the Atmega still dos not respond.
Can you guys make a guess whether placing 100 ohm at R2 can do some fatal damage to other components?

No, it would not damage it.
Btw, what crystal do you use for Atmega?

Can you try to take PIC18F2550 out of its socket and see if the LCD shows anything?
What are voltages on pins 10 and 30 of Atmega?
What are voltages on pins 11 and 31 of Atmega?
What are voltages on pins 1,2,3 of the LCD?

Did follow my advice from https://www.megadrum.info/forums/viewto ... ?f=3&t=492 starting from the second step?

I use the 16 MHz crystal

[dmitri]

Yes I looked at your LCD thread.

And what were your findings? Is it Atmega or the LCD?
If it's Atmega, get the ISP cable and see if you can read/program it.