Lightning took out power to AquaTrol display

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Clearly, that indicates you have a short circuit downstream causing the regulator to pop. You need to narrow down troubleshooting by process of elimination.

Do this,
1. unsolder the leg of R17 towards the edge or TP-2 and raise it off the bd.
2. test again the resistance and post it.
 
Good, now you're getting there and the only possible suspect is the U5. Refer to the schematic diagram and follow the voltage flow path.

1. Using a box cutter, cut the trace going to Pin# 10 of U5 as shown in the pic
2. test again, if the resistance measured went up in the Meg or K range then solder back the R17 in place.
3. test and post the resistance measured
4. If the resistance is within 30-40k ohms, you're good.
5. To confirm, test the resistance between pin 10 of U5 and Negative. If within 5 ohms, replace U5 (MIC5841YN)

 
jones6780 said:
Cut and isolated pin 10 of U5
checked ohms from R15 to pin 3 of U7, 0 continuity
R17 desoldered and U5 pin 10 to R15 neg is 5.0 ohms
Click to expand...
ok, We need to be on the same page. I was just going by your statement and thought 0 continuity is before you desoldered R17 in place.

Anyway, I have a sad for you! You have no choice but to remove U5. Once out, test the continuity between pin 10 and pin 4. If the Resistance is still within 5 ohms, then rest assured it's bad.

Soldering the 24V regulator in place is the last thing you would do. And make sure you use a known good regulator. If in doubt, you can temporarily solder pin 1 and 2 but lift pin3 off the board. Turn on the power and test pin 3 for 24 Vdc.
 
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