Electronics > Repair
Fluke 289 not quite sorted.
coromonadalix:
When the back case of the meter is removed, you see an white connector with an yellowish flexible foil who go to the front panel, named J3 on the pcb, this is the lcd supply and data connector.
https://www.eevblog.com/forum/reviews/fluke-287-dmm-teardown-and-photos/?action=dlattach;attach=11256
OR
like this lcd picture on Ebay : https://www.ebay.co.uk/itm/U-S-A-FLUKE-289-LCD-Display-Meter-Display-Fluke-LCD-OEM-new-/262485299580
nixxon:
--- Quote from: coromonadalix on October 15, 2018, 01:29:01 am ---When the back case of the meter is removed, you see an white connector with an yellowish flexible foil who go to the front panel, named J3 on the pcb, this is the lcd supply and data connector.
https://www.eevblog.com/forum/reviews/fluke-287-dmm-teardown-and-photos/?action=dlattach;attach=11256
OR
like this lcd picture on Ebay : https://www.ebay.co.uk/itm/U-S-A-FLUKE-289-LCD-Display-Meter-Display-Fluke-LCD-OEM-new-/262485299580
--- End quote ---
The flat flex ribbon cable for the LCD display looks like new. I undo it practically every time I take the meter apart to troubleshoot. If i seat the cable while the DMM is running, I can see funny artifacts on the LCD screen. So the LCD seems to be «alive and kicking»
Yakuzza:
@nixxon
Hello! Have you picked up the meter in Oslo? ;) I see you've went much further than I did in this attempt to rescue the poor unit. I gave up few months ago but I hope you will succeed!
Good luck!
Sent from my SM-G935F using Tapatalk
nixxon:
--- Quote from: Yakuzza on October 15, 2018, 06:16:23 am ---@nixxon
Hello! Have you picked up the meter in Oslo? ;) I see you've went much further than I did in this attempt to rescue the poor unit. I gave up few months ago but I hope you will succeed!
Good luck!
Sent from my SM-G935F using Tapatalk
--- End quote ---
Yes, I picked up the meter in Oslo three days ago. From you I guess. I suspect that the blue-green stuff that was found inside the unit is both corrosive and somewhat conductive. One of the solder pads for component DS2 was partly corroded away and made poor contact with the funny looking and somewhat transparent component DS2 with a diode-like symbol printed on the silk screen.
commongrounder:
--- Quote from: nixxon on October 15, 2018, 06:54:13 am ---
--- Quote from: Yakuzza on October 15, 2018, 06:16:23 am ---@nixxon
Hello! Have you picked up the meter in Oslo? ;) I see you've went much further than I did in this attempt to rescue the poor unit. I gave up few months ago but I hope you will succeed!
Good luck!
Sent from my SM-G935F using Tapatalk
--- End quote ---
Yes, I picked up the meter in Oslo three days ago. From you I guess. I suspect that the blue-green stuff that was found inside the unit is both corrosive and somewhat conductive. One of the solder pads for component DS2 was partly corroded away and made poor contact with the funny looking and somewhat transparent component DS2 with a diode-like symbol printed on the silk screen.
--- End quote ---
Would DS2 be the surface mount LED light source for the lead sensors? Its position directly between the jacks would imply it works as a common source for both photosensors. Wonder if there is a reflective part in the cover to split and redirect the light in the needed directions? The lack of light due to the corroded pad on the LED could explain why the meter was confused about the current jacks lead state.
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