Prusa I3 Pro B Black Acrylic Heating/extruder issues

[papershoes22]

Thats what I checked the first time... Its normal..

[zhangxueyou]

Swap the connection of hot bed thermistor and extruder thermistor, what is displayed on LCD screen?

[papershoes22]

Heres what it looks like:

http://imgur.com/A2fA9vn

still no heated bed =(

[zhangxueyou]

I get it . From your picture you take, after plug extruder thermistor to "B-Therm", it can read the temperature, rather than"0/0", so we can 100% conclude that the circuit of mainboard is normal, the hotbed thermistor is broken. Please contact customer service, let them send you a new thermistor. Before sending, I will test it for you.
Please tell me your purchase link, and your order number. And please contact customer service.
I am sorry for wasting you so much time.

[papershoes22]

Why didn't the heatbed heat up when i switched the thermistors though? shouldn't it have heated up then since it had a working thermistor?

[zhangxueyou]

Look at the LCD screen, as it diplays error, both thermistor can't heat up. Before you swap the connection, there was no error, so extruder thermistor can heat up.

[papershoes22]

Sorry, I didnt know you wanted both thermistors plugged in, the last picture i sent was only with the extruder thermistor plugged into the heatbed only, here is a picture of both plugged in but reversed... like you wanted..


http://imgur.com/KyA9tl5

[zhangxueyou]

It displays temperature again! Is 16 room temprature or a random number? Please swap the conncetion again, plug exturder thermistor to "E-Therm", hotbed extruder to "B-Therm".

[papershoes22]

yes, it is 16 degrees C where I am, but the bed is not 140... its as cold as the room im in..

So. If I switch the thermistors, and the temp stays the same as before on the extruder and bed.. wouldnt that mean its a bad board/ "B-THERM" port on the board??? The thermistors are working if I switch them and the board thermistor reads my 16 degrees or whetever it really is.

Because this is after I switched it back...

http://imgur.com/lVCNdUh

Sorry...this is getting old.....

there is ZERO lights on the bed on at all either.... bad heatbed???????

http://imgur.com/kBTWLfX

wouldnt that mean there isnt power going to it?? thus a bad mainboard or hotbed..

I'm no electrician, but I do work in the IT field for a fortune 100 company here in the US. I know bad parts when I see them. I have tried everything you have told me to do before you even told me on this forum. I dont know why you this is so difficult. It should have worked out of the box. Period.

thanks

[john]

I saw your pictures and now I have a question, do you mean you pluged a same thermistor into the bed thermistor slot and hotend thermistor to measure the temperature, but you got 2 different values, one is 18 degree and the other is 140 degree? I only want to know that can you get right value from bed channel. if the real temperature is 16 degree, can you measure right temperature by using themistor on extruder and bed temperature slot?