John Bostwick
TVWBB Wizard
OK, this one has me stumped.
I am fixing someone board and on the original main board had some issues and I figured I would just re-do the whole board, which I did. I kept the thermocouple Amp, the DC/DC, and some of the other parts. I completely changed out all the resistors and caps. Started up the board and it gives me noise on the thermocouple circuit.
I then put a new thermocouple Amp and still same noise. I checked and rechecked caps and resistors on the thermo circuit and all connections over and over again.
By now, I have replaced all major parts and still same noise and some what unstable thermocouple temperature.
Even when I don't have a thermocouple attached the noise graph will show some noise, but won't show the noise Icon. I also think when the thermocouple has a temp over 100+ it doesn't show noise(i think), haven't really look at when it shows and doesn't.
I tried my wall wart and the one supplied and also different plug ins and nothing seems to change the noise issue.
I really don't know what else to do. Usually, I when I have noise, it's and easy fix of a poor solder joint or so, but I have checked them all numerous times.
So, I come here hopefully some one would post something I haven't thought of yet.
I am fixing someone board and on the original main board had some issues and I figured I would just re-do the whole board, which I did. I kept the thermocouple Amp, the DC/DC, and some of the other parts. I completely changed out all the resistors and caps. Started up the board and it gives me noise on the thermocouple circuit.
I then put a new thermocouple Amp and still same noise. I checked and rechecked caps and resistors on the thermo circuit and all connections over and over again.
By now, I have replaced all major parts and still same noise and some what unstable thermocouple temperature.
Even when I don't have a thermocouple attached the noise graph will show some noise, but won't show the noise Icon. I also think when the thermocouple has a temp over 100+ it doesn't show noise(i think), haven't really look at when it shows and doesn't.
I tried my wall wart and the one supplied and also different plug ins and nothing seems to change the noise issue.
I really don't know what else to do. Usually, I when I have noise, it's and easy fix of a poor solder joint or so, but I have checked them all numerous times.
So, I come here hopefully some one would post something I haven't thought of yet.