You go get your rest. Don't want to bother you too much with this as I cant do this quick since my partner is not here who's really the one doing the soldering. I can do it but I'm slow. Let's communicate again when you wake up. Thanks.dmitri wrote:Better be quick, I'm about to go to bed.
Voltage still not 3.3v but only 1.4v and IC still gets hot.estregan wrote:1. Disconnect wires 2,3 and 6 of the USBExt connector. Place PIC18F2550 into the socket, power it up. Is the voltage on the pin 14 still not 3.3v? Is the IC still getting hot? If so, go to step 2.
Same result, voltage measured is +1.4 and IC still gets hot.dmitri wrote:2. Disconnect C4. Measure voltage on the pin 14 again. Is it 3.3V?
Voltage measured still +1.4 only. IC still gets hot.dmitri wrote:1. Solder C4 back in.
2. Disconnect R5, C1, C2 and X1. Is voltage on the pin 14 still not 3.3V? If so, go to step 3.
Sorry, I don't have a spare PIC18F2550, I just order it from abroad as its not available locally, plus its a bit expensive.dmitri wrote:3. Do you have a spare PIC18F2550? If yes, try it now instead. Still no 3.3V on the pin 14 and the IC gets hot?
Ok. I will try to build a new digital board and report back what happens asap. I will also try to source new PIC18F2550.dmitri wrote:Have a look at it: you effectively disconnected everything from PIC18F2550's pins except power. Why would it still get hot? I see only two reasons.
1. There is still a shortcut somewhere
2. PIC18F2550 is fried, which can be a result of existing/previous shortcut.
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