Hey folks, wasn't sure what thread to put this under but I was working on a dead Intelliph and discovered some interesting things... but first, here's a rough (and I do mean rough) schematic that I drew:
What I noticed is that not only were the comm chip (U5), protection diodes (D3, D4) and relay (RL1) blown, but also transistor Q5 that switches power from the primary voltage regulator (U1) to the secondary voltage regulator (U2). U1 is working fine and outputs ~11volts, but U2 was also blown... it doesn't actually regulate anymore.
U2 is supposed to generate 5-volts for the PIC microcontroller (U3) but in my case - and I don't know how, but the microcontroller still actually works! - U2 basically spits out the input voltage (minus a small drop). This is bad because the PIC microcontroller expects 5v but U2 was outputting around 10.
Now, the PIC in this other thread suffered a catastrophic failure, and while @generessler initially thought the blown pins were GPIO pins, they're actually the supply voltage pins (Vcc and Vss)... pin1 for the chip is actually right next to the U3 label, so the burned pins are 6 and 7. So I wonder if regulator U2 was also dead on that board, and fed way too much voltage to U3??
www.troublefreepool.com
Anyway, I'd be curious what @generessler @Dirk and some of the other guys think?
What I noticed is that not only were the comm chip (U5), protection diodes (D3, D4) and relay (RL1) blown, but also transistor Q5 that switches power from the primary voltage regulator (U1) to the secondary voltage regulator (U2). U1 is working fine and outputs ~11volts, but U2 was also blown... it doesn't actually regulate anymore.
U2 is supposed to generate 5-volts for the PIC microcontroller (U3) but in my case - and I don't know how, but the microcontroller still actually works! - U2 basically spits out the input voltage (minus a small drop). This is bad because the PIC microcontroller expects 5v but U2 was outputting around 10.
Now, the PIC in this other thread suffered a catastrophic failure, and while @generessler initially thought the blown pins were GPIO pins, they're actually the supply voltage pins (Vcc and Vss)... pin1 for the chip is actually right next to the U3 label, so the burned pins are 6 and 7. So I wonder if regulator U2 was also dead on that board, and fed way too much voltage to U3??
IntelliPh Board Burned
My IntelliPh recently stopped working. Last month, I noticed that the pump was making a rough noise when running. Inspection revealed a very worn and hardened pump tube. Replaced the tube and the system went back to sounding normal while pumping. Checked the system last night, and the...
www.troublefreepool.com
Anyway, I'd be curious what @generessler @Dirk and some of the other guys think?
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