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Nava don´t works, help. Microcontroller problem?
Posted: Jan 24th, '17, 08:12
by Huertos
Hello everybody.
I just finished my nava with the last bom update (Nava v1.0 BOM [5/18/16 IMPORTANT BOM UPDATE)]. Every module checked and seem to be ok, all voltajes on ics messures properly. When I turn on nava, all the buttons and leds are lighted but don´t show anything on the lcd (lcd adjusted), sequencer it´s not running, any sound from any output. Maybe the ATMEGA isn´t proprerlly flashed? Any idea? I´m getting crazy
Thankyou very much in advance
Re: Nava don´t works, help. Microcontroller problem?
Posted: Jan 24th, '17, 08:31
by KlangGenerator
Sounds to me like IC115 is the problem. Try replacing it. Display adjustment is done with TM3. Also take out the resistor at R694 and put in a wire instead. The display has a resitor built in for the backlight, so the 1.2k one in R694 causes it to be too dark.
IMPORTANT: Always turn off your Nava when doing any changes or touching the board. Otherwise you run a high risk to damage components, especially ICs!
Re: Nava don´t works, help. Microcontroller problem?
Posted: Jan 24th, '17, 09:33
by Huertos
Hi Klang. I´ll try with replacing the ic115. I did the display adjustment in TM3, If i trim to máximum position I can see the red squares for the letters but any letter, so do you mean I need change the value of R694.
Thankyou verymuch in advance
Re: Nava don´t works, help. Microcontroller problem?
Posted: Jan 24th, '17, 10:04
by KlangGenerator
If you can't see anything then the issue is somewhere else. With the 1.2k implemented the light is just more dim. But try replacing IC115 first. I am very sure this is the reason why your display is dark...
Re: Nava don´t works, help. Microcontroller problem?
Posted: Jan 24th, '17, 15:19
by 4teenth
Sorry to hijack, but do you reckon my problem could be IC115 too?
viewtopic.php?f=24&t=1093
Re: Nava don´t works, help. Microcontroller problem?
Posted: Jan 25th, '17, 11:24
by KlangGenerator
No, I don't think this relies on a faulty IC115. Sounds more to me like you destroyed the LCD when trying to desoldering it. Use something like this next time you want to do complex desoldering work:
http://komerci.de/shop/product_info.php ... 4d85e36d4a Really not that expensive and it is really easy to use. I recently desoldered 7 ICs with this tool in under 5 minutes on a Nava sequencer!
https://www.youtube.com/watch?v=v0iA_b0WTDg
Re: Nava don´t works, help. Microcontroller problem?
Posted: Jan 30th, '17, 13:56
by 4teenth
I assumed the LCD was toast, so I replaced it with a band new one rather than risk using the old one.
That looks like a nice desoldering tool though, I might check that out - I've been getting by with a cheap heated tool with solenoid pump type deal, which was a step up from the heated tool with manual spring pump, but still nowhere as nice or quick as that one. And seeing as I have another TTSH kit to put together, and a Jasper Wasp clone it might be a worthy purchase...
Re: Nava don´t works, help. Microcontroller problem?
Posted: Feb 11th, '17, 13:26
by Huertos
Hello everybody. I replaced the ic115 and no way. The problem still there, sequencer not running, no characters on the display so any sound. I replaced the ic115 with this two kinds of semiconductors
http://eu.mouser.com/ProductDetail/ON-S ... 6aiLsuk%3d
http://eu.mouser.com/ProductDetail/Micr ... WI51o17Dff
Could be the atmga is not properly flashed? I cheked all the pcb , voltajes... everything seems to be ok.
Re: Nava don´t works, help. Microcontroller problem?
Posted: Feb 11th, '17, 17:04
by lukep_gdansk
Yes, it is possible that Atmega is dead.
Re: Nava don´t works, help. Microcontroller problem?
Posted: Feb 11th, '17, 18:35
by KlangGenerator
Did you do a complete reset? Press "start" and "stop" when powering up, then initialize eeprom by pressing "start' and "enter". Also did you adjust "tm3" for display contrast?