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ISG Infrasys Elite XR - Power Issue

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7magman:
Scored this guy non functional on ebay and figured it could fix it up. Dead on arrival. Pulled the thing apart, checked the polarity, hooked up bench power. Power? Board is getting power but I'm only getting a trickle of power (<0.2V) out to any of the main board or to the FPGA. Looks like one of the components is cooked on the power board...see attached

Current plan is to replace the component - but I went through and ID'd most of the components (to the best of my ability, mistakes possible) to try and understand the workings. Can anyone help me understand how this board might be regulating power - and if something else might have caused that Schmitt trigger to fail and it's only a symptom and not the cause?
I did see this post:
--- Quote from: cynfab on February 06, 2022, 04:18:34 pm ---Pretty much done with the schematic for the interface board.
Any corrections or comments welcome.
I replaced the BNC on the front with a 4 pin Fischer connector and wired it up to the J1 video output and a small DC-DC to convert the +BATT to 5V for the external RunCam FPV DVR. Works OK on the bench. Produces .avi files. The DC-DC is necessary as its internal DC-DC can only take 5.5V max. and I didn't want to load the ISG's 3.3V. BTW the +5V test point goes to J2 and nowhere else.

--- End quote ---
which tells me the triggers are used for some sort of signal conditioning used in the connection to the FPGA? Unsure if that failure would cause the screen and rest to completely not be functional...

basecase:
Hello. Did you get the Elite XR with 100K sticker on it? That one strictly uses 10-12V while the version without (just the silver XR) takes up to 15V. There's also a chance the power button might not be working, so do check that out as well.
Lastly, would also help if you could include some pictures of the PCB where the original battery pack plugs into. I think there are some inline 0 Ohm resistors on that board that could have been damaged from dropping.

7magman:
Sorry should have included more photos, new to the forum. Yes, the camera has the yellow 100k sticker on it and what I assume is the same core as the E/X? 380 based on how the core looks. (ULIS 384?). Serial number ends in HR.
Both resistors show 0.4 ohms on my meter. so nearly zero. I did verify 12V to the power board from backprobing. Both switches showed continuity when pressed.

cynfab:
Several years ago I got an ISG 100k off e-bay. Sold as non working, but the boards inside were not plugged into each other properly. Easy fix.
I spent some time reverse engineering the NFPA board. Here is the schematic set I came up with.
Might not be 100% complete, but it is close...

7magman:

--- Quote from: cynfab on May 12, 2024, 12:44:19 pm ---Several years ago I got an ISG 100k off e-bay. Sold as non working, but the boards inside were not plugged into each other properly. Easy fix.
I spent some time reverse engineering the NFPA board. Here is the schematic set I came up with.
Might not be 100% complete, but it is close...


--- End quote ---

Wow.. awesome! An incredible amount of work you put into that.  I'm hopeful to replace that trigger tomorrow...will report back with test results. The diagram should be very helpful for me to verify everything is working as it should via the test points.

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