Alright! I've got some updates.
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I pulled off the front panel and did a close inspection of the display connections, didn't see anything obvious but cleared out some plastic and some small fibers, possibly from my sweater or ambient dust.
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Checked R110 and R112, both of those appear to be in fine condition. During normal operation both read at around 1.6V.
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Checked resistance between VDD & VCC. When my positive probe was on VDD & ground probe was on VCC, the resistance started at around 3.2kΩ and maxed out at around 4.46kΩ.
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When my positive probe is on VCC and ground probe on VDD, it starts at 2.8kΩ then climbs up to around 6kΩ, then there's a spike up to 28kΩ, then it descends back down to and stabilizes at around 7kΩ.
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I checked D109 and it seems good as well - no obvious heating or anything like that.
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No GPS currently installed, and it wasn't installed during any of my earlier tests.
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Now for the interesting part. After checking all of the above, I turned it on and held steady for about 5 minutes. So I thought I'd try out the terminal again. This time I was able to connect! Previously, it would freeze at the exact moment I hit "enter" to initiate the serial connection. This time I was able to open the menu and even run some diagnostics! Attaching the screenshot from the diagnostics view below.
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In fact the terminal session was going so well, I thought I might've cleared up whatever the issue was. Unfortunately, it froze again shortly after that. I believe I'd entered into the RF Filter Sweep menu item and was watching the output when I saw the current jump from 0.8A to 0.20A and cut the power.
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The only substantive things I can think of that I did were:
- I unplugged the front plate and removed some melted plastic from the very top left female port of JP215
- I used the tip of one of my probes to clear out the channels between the pins of JP215, JP216, and JP201
- I took my and blew out some of the fibers I saw
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I am wondering if it's temperature related or possibly related to a capacitor somewhere(?), because it seems to perform much better after 10+ minutes of no use, vs 30 seconds to 1 minute of no use. If I wait 10 minutes or more, I can usually get a good few minutes of use, but if I only wait a few seconds or a minute after cutting power, it will either start in the frozen state, reach the frozen state after a few seconds powered on, or the screen wont power on at all, and rather than drawing 0.20A, it'll draw about 0.14A.
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Michael Shiplet