LED on heatbed issue.
So i made a boo boo, and kinda popped the LED off the heatbed.
On the bottom of the LED there is an arrow to show proper install direction, but I cant tell which way the arrow on the board is facing, and i would rather not try to wire it as I could accidentally bump 24v through the lcd and cook it.
Does anyone know what LED this is? (Incase its broke I'm gonna order one(or some) tomorrow, so i can get them on Monday(maybe even Sunday), as if I order saturday, it could come as late as Wednesday.
Also, if a detailed circuit board print design thing exists, a link would be greatly appreciated.
Edit: corrected LCD to LED.
Speed typing on phone at work fail.
Hi, I'm Sean. I used to work on CNC machines.
I try to not make mistakes, but the decision is YOURS.
Please feel free to donate to my filament/maintance fund.
Re: LCD on heatbed issue.
LCD? Do you mean the LED on the heatbed??
Re: LCD on heatbed issue.
Sean,
I think this forum posts addresses the LCD component issue:
https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/lcd-screen-blocking-out-t12481.html#p61542
Re: LCD on heatbed issue.
Errr yep. LED, back of heat bed between 24v solder joints.
I took the cover for the wires off, put them back on, and noticed the LED chilling on the heat bed. I'm not really worried as i know the printer will work properly without it, just wanna fix it, and if I have to order a green surface mount LED to replace it. (I just don't know anything about these tiny components. Haven't messed with electronics in 20 years, i have picked up some toys recently, but haven't started assembly due to delays in Chinese shipping)
No issues with LCD panel, besides button already failing. Either its gonna fail, or get better.
(I think autocorrect is messing with me... And I'm at work. I broke it early this morning, and haven't slept enough today... Guess what I'm doing when I get home... Not sleeping... Fixing this thing)
Hi, I'm Sean. I used to work on CNC machines.
I try to not make mistakes, but the decision is YOURS.
Please feel free to donate to my filament/maintance fund.
Re: LED on heatbed issue.
there are different markings on LEd's
see below
hopefuly these will help.
do you need to order a replacement, the existing one should be OK to re use...
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: LED on heatbed issue.
there are different markings on LEd's
see belowdiodes-led-s.jpgsmd_led_polarity_medium.jpgLED-Outline-1206 (1).gif
hopefuly these will help.
do you need to order a replacement, the existing one should be OK to re use...
regards Joan
Purrfect! Thanks.
The old one was fine. Obviously had a weak solder on it, and me being a idiot broke it off... Fixed now.
It's a 24v LED as well... Which seems really... High.
Hi, I'm Sean. I used to work on CNC machines.
I try to not make mistakes, but the decision is YOURS.
Please feel free to donate to my filament/maintance fund.
Re: LED on heatbed issue.
There’s technically no such thing as a 24V LED. There is a 1K Ohm resistor in series with the LED on the schematic in GitHub.
When someone asks you if you're a god, you say, "YES!"
Re: LED on heatbed issue.
There’s technically no such thing as a 24V LED. There is a 1K Ohm resistor in series with the LED on the schematic in GitHub.
Yeah, like I said, seemed odd. Multi-meter still showed 24v. Doing the ohms law calculator, finds that is a .05watt led... Roughly. (Or at least capable of that)
Where are the schematics on github? I only know of the 3d models, and assorted bits of software.
Hi, I'm Sean. I used to work on CNC machines.
I try to not make mistakes, but the decision is YOURS.
Please feel free to donate to my filament/maintance fund.
Re: LED on heatbed issue.
Where are the schematics on github? I only know of the 3d models, and assorted bits of software.
https://github.com/prusa3d/Heatbed_MK52_magnetic
When someone asks you if you're a god, you say, "YES!"
Re: LED on heatbed issue.
with the LED disconnected, you would see the full 24 volts across the pads.
once the LED is re installed you would measure something like 1.8 to 3.8 volts across the diode
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK