2nd Chance PI

[dantech]

Peace and the end of off topic. It was only greeting and nothing important for other users

[Qiaozhi]

Yes author of this mod should be greeted in pure Polish. Of course we can freely communicate in multi languages manner - so will be the much understandable to make our goals.

Regards
Don.

This is an English language forum. We ask that posts be written in English to maximize participation. If English is not your native language, just do the best you can.

[DonCaffeDelaSkobalj]

Yes author of this mod should be greeted in pure Polish. Of course we can freely communicate in multi languages manner - so will be the much understandable to make our goals.

Regards
Don.

[dantech]

Nothing wrong. Hi has greeted me in my native language by courtesy probably via google translator

[Qiaozhi]

dobry dzień dantech.
cześć.ładny projekt

Please read the Forum Rules -> Basic Rules of the Forums
and make your posts in English.

[DonCaffeDelaSkobalj]

dobry dzień dantech.
cześć.ładny projekt

[ripsdevala]

Backlight... no light come from it, the square dot graphic is visible clearly.

Is there any change from back post?
Post#49

http://www.geotech1.com/forums/showthread.php?23424-2nd-Chance-PI/page2

[dantech]

Do you mean that you see graphics on LCD?

[ripsdevala]

My bad...
I think i just broke my backlight

The contrast is okay now

[dantech]

No! Your wiring is reversed and wrong. That is probably the reason +5V power line is overloaded and 78L05 is hot.

LCD+/LCD- : this is LCD module power supply

LED+/LED- : this is LED backlight

[ripsdevala]

Let me check again...
Yes, i use 1k before, to make sure i use 1k vr, but same result.
Let me know if my lcd power is cabling right.

[dantech]

something wrong with LT1054. The positive and negative values should be nearly the same. You have difference 1V what is to much difference. Check capacitors polarity. Near LT1054 one of them should be placed as "reversed"

I use common resistor (not POT) 1k with my LCD. You have to find proper value for your LCD. Try different values or put POT eg. 20kohm and try to set contrast properly

[ripsdevala]

LT1054 pin5 -10.4v, pin8 11.5v

Add 1k vr on pin 1 and 3, lcd is apear black dot, but not visible enough.
I use your pcb layout, lcd with the keyboard

[dantech]

Ad. 2 +12V/-12V you will find for instance on pin 5 and 8 of LT1054. 78L05 should not be hot. Check power consumption. Something is wrong

Ad. 6 and 7
You have to use an oscilloscope. Signals on crystal and SPI bus tell us that CPU is alive and tries to communicate with external device (ADC)

Ad. 9 I do not know what pcb you have but in my case I have resistor 1kohm between pin 1 and 3 of LCD

[ripsdevala]

1. Remove all ICs ....done
2. Check power supply lines +5V, +12V, -12V. Power consumption should be circa 30mA
+5 ok, alittle hot 78l05, +12v where?, -12v ?
3. Check shortcuts on PCB near ATmega328.... No short
4. Verify Atmega328 fuse bits and flash memory content
...done, all ok
5. Put ICs back... Done
6. Check oscillogram on crystal pins... What is that??
7. Check signals on ISP bus (eg. clock signal for ADC)
....Never hear that
8. Check LCD connections ... All ok
9. Check LCD contrast resistor.... Cant find R24 to adjust contrast

Im not an electro expert