replace DM1106EN on UT210e show error and not working  - Page 1
Forum section: electronics / repair

author: minhtri0405
author_rank: Newbie
timestamp: September 09, 2024, 04:01:32 pm
content: Hi all, firstly sorry for my bad English due to I'm vietnamese.I have a ut210e with dm1106en chip, it's still working good but sometime in resistance mode it is not show OL, it is show random value about >10 20mega ohm.so i think chip DM1106 have bad . then I buy a new one and replace the old one.unfortunately , it is not power up, only red led light up and short beep when turn on. I have tried to enter CAL mode by hold select and hold button and turn knob to resistance and it show "erre". please help me this case. the DM1106en is programmable chip ?(i think not). I also write eeprom 24c02 but nothing better. the original chip is stay alone in picture.thank you so much

author: coromonadalix
author_rank: Super Contributor
timestamp: September 09, 2024, 04:17:38 pm
content: from :http://improwis.com/projects/reveng_multimeters/#DM1106ENand the Github link on itcould be an programmable processor or need something to work ... or the eeprom is dud

author: minhtri0405
author_rank: Newbie
timestamp: September 10, 2024, 12:22:56 am
content: thanks for your info. eeprom not dead. i can read write it ok. but if the new chip is death it can not show "erre" when enter calib mode. so i guest need to do something when change a new chip

author: coromonadalix
author_rank: Super Contributor
timestamp: September 10, 2024, 01:31:17 am
content: sometime called an ASIC sometimes it should work if the eeprom is okay, unless ...pls recheck your soldering just in case ...

author: Gyro
author_rank: Super Contributor
timestamp: September 10, 2024, 08:41:28 pm
content: Quote from: minhtri0405 on September 10, 2024, 12:22:56 amIt's likely that you have a problem with the contents of your EEPROM (yes, ErrE indicates EEPROM error). The EEPROM doesn't just contain calibration settings, but also configures the functions of the meter (it is used in several DMMs, eg. the AN8008) with different functions. Entering calibration mode with incompatible function settings is likely to cause an error...https://github.com/bdlow/UT210E(and included links, particularly Kerry Wong).Edit: Also check the UT210E mega-thread...https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/Youmightfind an EEPROM image there, but make sure it is for the DM1106EN rather than the DTM0660L which was used on earlier meters. If you can identify the configuration error, you may be able to edit just that item rather than a full re-calibration.

author: minhtri0405
author_rank: Newbie
timestamp: September 11, 2024, 01:01:15 am
content: Quote from: Gyro on September 10, 2024, 08:41:28 pmI'm solder back to original chip and it's still working normally, so eeprom 24C02 is good, I also had a rom-backup file. Might the new DM1106EN is bad, not sure for that, also checking soldering not shorted any chip pin.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 12, 2024, 01:43:00 am
content: be sure to clean properly the ic pins with ipa or else, any contaminant could cause wrong values, as for the orriginal problems ... is the ohm ok or still bad ?an eeprom could get corrupted, the dmm ic could work to some extent, but could fail on certain function(s) and or range(s)happened to me had to redo calibrations ... gave me eeprom errors codes

author: minhtri0405
author_rank: Newbie
timestamp: September 13, 2024, 05:15:58 am
content: Quote from: coromonadalix on September 12, 2024, 01:43:00 amThanks. the ohm is ok at the moment, in the past resistance measure was not totally failled , sometime the screen show vallue in xx MegaOhm and rising up in few a minute to "OL".The error code show in screen is "erre" when enter in calib mode. in normal all modes did not show anything & Led NCV light up.