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[solved] Rambo HeatBed Mosfet defect?

Posted by ähM_Key 
[solved] Rambo HeatBed Mosfet defect?
July 15, 2018 05:25AM

From one day to another my heatbed connected to my Rambo 1.0e stopped working.

What I tested at the beginning:
- Fuse: ok
- PowerSupply: ok
- Heatbed: ok
- visual inspection of the Rambo: ok

But: LED at heatbed does not light up. Only in the moment of switching on, there is a tiny flash.

So I disconnected the heatbed and figured out the following:
When switching on, the headbed LED flashes shortly (~0.5 seconds) with full brightness (brighter than with connected heatbed) and continues to glow dimmed.
I've attached a picture where you can see that.
I measured the output voltage (still without load) with different heatbed input voltages:
12V: 2.0V
16V: 2.2V
24V: 2.5V

Any ideas what I can try as well/what might be defect?

Thank you!

Kind regards,

Edited 1 time(s). Last edit at 07/15/2018 06:12AM by ähM_Key.
open | download - LED.jpg (344.3 KB)
Re: Rambo HeatBed Mosfet defect?
July 15, 2018 06:11AM
It's always the same...few minutes after detaild description...failure found!

The power connector (X33) was defect! Soldered the cables now directly to the Rambo.

Thanks for listening winking smiley
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