Hello!
Last week I borrowed the dmm from my work colleague. Initially I checked some DC voltages and some resistances on a board, everything was as expected. Then I needed to check the overall current consumption of the board (few hundred mA), but the 11A fuse was already dead. So I turned it off, disconnect the battery, open the case, replace both fuses actually because both were dead. Then put everything back with care and...surprise...the dmm was dead, nothing on the display no matter the position of the rotary switch, no light, no power-up options, no beeps when pressing the buttons. I was never expecting that on a "lifetime warranty" Fluke.
I took it home and promised to repair it. First I checked if the battery voltage was present on the board...it was, so the battery clip + wires + pcb connector are ok.
Then I checked for broken/corroded traces, broken solder joints, burned components...nothing so far.
The range switch spring contacts are just fine and there are no heat marks anywhere.
Then I searched here on the forum for repairs of 175, 177, 179 and 77IV models. I got a few hints to check myself, but still no success. The power supply module seems to be ok - I get one 3v3 and two 5v outputs.
I tried to supply it with a bench PSU and I noticed that there is no current consumption, not even 1mA.
If you have any ideas on what I should further check, please let me know...