Here are some photos of my 187. The quality isn't wonderful as I only have an old Canon Powershot A560, and took them using natural light. If anyone needs more or better pics, let me know and I'll try to oblige.
I am not going to repeat much of what free_electron said here -
https://www.eevblog.com/forum/repair/fluke-189-teardown-repair/ - so read this in conjunction that.
I hope the way I've done this is OK - it's my first - notes are under the pictures. I don't have the meter with me and have written the comments based on the pics, but hopefully I haven't missed anything.
PCB underside - this is what you see when you open the case. It's fixed to the front with two screws, one through the hole in the shielding cover, and the other to the left of the smaller fuse. The larger fuse has been replaced with an incorrect 15A one. Note the battery contact pads at top centre.
Close up of fuse contacts - the red dots are adhesive. Note the fuse sizes are copper tracks, as are other designations - no silkscreening on this PCB. The larger fuse is given as 10A on the PCB but elsewhere as 11A.
Under the cover is a custom chip for range switching, true-rms conversion, and ADC, plus the Analog Devices REF43 voltage reference. Note the guard tracks around the thick film voltage divider, also the way that the pins on the IC have been laid out in sequence - one of the benefits from designing your own ASICs.
Upper part of the underside. The square grey part with a corner cut off is the bleeper. Pads for calibration switch to the right of it. To the left is an unpopulated footprint for the supercap which is used for memory retention on the 189 - it's notorious for leaking. Backlight connector at bottom left. I'm not sure what the unpopulated DIL pads at bottom right are for - they're not populated in the 189.
EDIT - the part above it is a 93C55 serial EEPROM (calibration constants?) - but as the empty pads are parallelled horizontally I'm don't think they're for this in an alternative package. Perhaps they're for a 2 x 4 surface mount header for ICSP, JTAG, or something similar (although I would have thought a pin or two more would be needed).
LT1307 DC-DC converter driving a transformer. It appears to generate three separate output rails based on the output diodes and caps. I think I read something saying that it can run the batteries down to above 1 volt each, which seems pretty good. The transformer is by Coiltronics, who appear now to be owned by Cooper Bussmann.
IR tx / rx on the top edge.
The CSB455J is a 455kHz ceramic resonator by Murata. Not sure what it's for - possibly the LCD - it seems to be connected to the LCD driver which is on the other side of the board. Note the red dots of adhesive, almost certainly applied with a syringe.
I think that's enough for one post. I'll do the other side of the PCB in another post.