| Products > Test Equipment |
| Uni-T UT139c LCD biasing and other mods |
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| Kbird:
Been a while since I did the mod but I believe you are correct on all counts NiteC0re ,setting the value to 0 (00) should mean there is no time out , so both would become Manual. There are other hacks you can do too , look for posts on DMM 660L Chipset DMM Hacking eg the Uni-t 210E has the same Chip and is also hackable.. https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1034969/#msg1034969 If you plan to use it for mains voltage testing it is recommended not to set it up any higher than a 8000 count meter though as it may read incorrectly especially at or above I think it is 200volts eg 220v or 240v.... there is more info in a post here about a Canadian Tire DMM with the same chip , commenting on this issue. https://www.eevblog.com/forum/testgear/canadian-tire-mastercraft-dmm-new-and-old-revision-teardown/msg927276/#msg927276 KB |
| Nitec0re:
Thank you for ur help It worked :scared: --- Code: ---DTM0660 EEPROM dumper and updater. Waiting for DTM0660 POST and i2c Bus to settle. 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 2C 01 08 C8 03 10 : 10 27 38 18 4E 02 65 4B 3D 3D FF 3B 0A FF 40 FF 20 : 77 98 AF 81 FA 00 32 00 00 80 00 80 4B 7D DE BD 30 : 4E 02 09 25 03 09 62 FF 0A D7 13 0A AE 03 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 : 97 7F 89 80 01 00 84 2A 00 00 00 00 00 00 00 00 70 : 61 7F 00 80 61 7E E0 7C 57 2B 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 EC 0F 0F 80 00 00 Setting LCD bias to 3.3V Done Extending Power On time Done Extending Backight On time Done Done. --- End code --- |
| Kbird:
good news :) .......now you'll want a 210E to play with too :) |
| Folxs:
--- Quote from: frozenfrogz on February 18, 2017, 06:50:15 pm ---The factory setting for my meters VLCD was 3.0V (taken from the memory dump). I reprogrammed it to 3.3V and the display is now pretty usable. For my taste, the contrast could still need a little bit more oomph, but I am not complaining. 3.3V is the maximum setting, as the DTM0660L datasheet indicates. (...) Anyone wanting more info on the issue, feel free to ask! --- End quote --- I assume that VLCD is contrast, but what does VDD does? Changes supplyment od all ICs? Maybe it is possible to take VDD (3.6V) and short it to VLCD to gain better contrast? (just wondering if antyhin won't burn on PCB) |
| UK:
Sorry for the upping such an old thread. But I have a newbie question, how do you guys think will these hacks work for a newer UT139E model? |
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