Products > Test Equipment
Uni-T UT139c LCD biasing and other mods
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Kbird:
Thanks Frozen , You are correct I am New to Arduino too , I started a few months back converting some Old TM HOTAS Joysticks etc to USB, via the Leonardo or Pro Micro and MMJoy2 (custom Firmware) which does not require a whole lot of Arduino knowledge in and of itself , so I appreciate the Help and Hints.

I could not find a SOIC Clip locally and didn't want to wait 30-60 days ...again... the Pro Micros I ordered 2 months ago , have still not arrived , nor has a small 2 port USB KVM which was ordered 6 weeks ago .

Honestly I am not sure if the broken out Pins have worked or not , just not sure why I have a 4 - 4.5 minute Backlight time now :)  , I did not see anything in the Serial Monitor Window though .

I was hoping to just make the BACK-UP of the EEPROM , last night and then spend some time understanding and making the changes , since it is years since I fooled with a HEX Editor.

I did find that Russian Thread here too :

http://kazus.ru/forums/showthread.php?t=112135

one of the Guys there made a Dump Editor , though I don't know if it works for the 139C as well

http://kazus.ru/forums/showpost.php?p=1024371&postcount=531


Thanks again I appreciate it.

KB.

frozenfrogz:
Regarding the SOIC8 clip, you could go DIY with the help of a PCI slot from an old board.
See this thread for reference

Searching for "SOIC8 clip DIY" on the web should also get you various options. :)
Kbird:

Thanks for that link  interesting, I might have to give it a try , as I am not having much luck ordering stuff off AliExpress and other such Sites.

frozenfrogz:
Yes, AliExpress is mostly cheap crap not worth paying a parcel service to ship stuff from China/Asia.
You might get lucky, but actually you will need to do a whole lot of research ;)
Kbird:
Hi FF , actually the 5 socket Female Pin Header I Soldered in to the Breakout Area is working and thanks to your Sketch File I can "see" the EEPROM Dump in Serial Monitor or CoolTerm  , it takes a while to start ...maybe 30 secs as per the sketch , then it Reads the eeprom in a loop but seems to crash after about 8-12 "Prints" to the Terminal Window. I am using a Leonardo , I see you are Using an Uno , is the lockup something that could be caused by that difference do you think?

Still reading up on Serial Terminal , so as yet I have not been able to save the eeprom  but this is what is seen in CoolTerm with a Capture to Text File. From the Dump I can now see my Backlight is indeed 255 secs (FF), or 4 1/4 minutes.

Scanning...

I2C device found at address 0x50
-- : 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00 : FF FF FF FF FF FF FF FF FF 52 00 F0 00 DC B9 03
10 : 10 27 38 18 4E 02 65 4B 3D 3D FF 3B 0A FF 40 FF
20 : 51 98 3D 81 FA 00 32 00 00 80 00 80 4B 7D AE B1
30 : 4E 02 09 8D 02 09 CE FF 0A 3C 14 0A CE 02 0A 00
40 : 00 01 00 01 00 07 98 00 64 00 64 00 64 00 00 00
50 : 00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80
60 : 9D 7F 04 80 01 00 A5 2A 00 00 00 00 00 00 00 00
70 : 6B 7F 00 80 98 80 E0 7C F3 2A 00 00 00 00 00 00
80 : 00 00 00 0E 00 10 1E 18 00 00 0C 12 13 07 03 01
90 : 00 00 00 0F 00 11 00 19 00 00 0D 00 15 09 04 02
A0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 0A 00 00
B0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 0B 00 00
C0 : 0D 00 02 20 0D 00 03 20 20 00 03 20 20 00 03 10
D0 : 41 00 03 08 41 00 03 05 41 00 03 05 0D 00 02 20
E0 : E2 F1 0B 80 00 80 00 80 00 80 00 80 00 80 00 80
F0 : 00 80 00 80 00 80 00 80 5A C7 FF 0F FF 80 00 00 

Done.

Scanning...

I2C device found at address 0x50
-- : 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00 : FF FF FF FF FF FF FF FF FF 52 00 F0 00 DC B9 03
10 : 10 27 38 18 4E 02 65 4B 3D 3D FF 3B 0A FF 40 FF
20 : 51 98 3D 81 FA 00 32 00 00 80 00 80 4B 7D AE B1
30 : 4E 02 09 8D 02 09 CE FF 0A 3C 14 0A CE 02 0A 00
40 : 00 01 00 01 00 07 98 00 64 00 64 00 64 00 00 00
50 : 00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80
60 : 9D 7F 04 80 01 00 A5 2A 00 00 00 00 00 00 00 00
70 : 6B 7F 00 80 98 80 E0 7C F3 2A 00 00 00 00 00 00
80 : 00 00 00 0E 00 10 1E 18 00 00 0C 12 13 07 03 01
90 : 00 00 00 0F 00 11 00 19 00 00 0D 00 15 09 04 02
A0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 0A 00 00
B0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 0B 00 00
C0 : 0D 00 02 20 0D 00 03 20 20 00 03 20 20 00 03 10
D0 : 41 00 03 08 41 00 03 05 41 00 03 05 0D 00 02 20
E0 : E2 F1 0B 80 00 80 00 80 00 80 00 80 00 80 00 80
F0 : 00 80 00 80 FF

          this is what is seen ^^^^^ when it locks up  (not always same spot) , resetting the Leonardo usually gets it going again.

but I just had a thought that perhaps I had both Serial Terminals Open by accident and they were both trying to access/connect at the same time...


I have actually asked for my money back after 2 months of waiting for the AliExpress Shipment but the Seller extended the period by another Month and has not returned the Money...


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