Heatbed MOSFET gets way too hot July 31, 2017 07:37PM |
Registered: 6 years ago Posts: 22 |
Re: Heatbed MOSFET gets way too hot August 01, 2017 02:04PM |
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Re: Heatbed MOSFET gets way too hot August 01, 2017 08:19PM |
Registered: 6 years ago Posts: 22 |
Quote
SteveRoy
You could replace the MOSFET with a IRLB8743PBF
I've used them on the cheaper China RAMPS boards in the past before I found a quality RAMPS
Re: Heatbed MOSFET gets way too hot August 02, 2017 01:47AM |
Registered: 9 years ago Posts: 5,232 |
Re: Heatbed MOSFET gets way too hot August 02, 2017 10:02AM |
Registered: 6 years ago Posts: 22 |
Quote
o_lampe
You could check the 5V regulator onboard the GT2560. If it doesn't supply at least 4.7V your MOSFets won't switch fully ON. Thats where the big voltage drop comes from...
The other MOSFets fully switch at 3.3V, so they stay much cooler
Re: Heatbed MOSFET gets way too hot August 02, 2017 05:34PM |
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Re: Heatbed MOSFET gets way too hot August 02, 2017 07:13PM |
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Re: Heatbed MOSFET gets way too hot August 03, 2017 07:40AM |
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Quote
obewan
It looks like you have soldered the grid pin to ground, this is the right hand pin in your photo, it should be a small solder pad, not connected to the large mass.
Re: Heatbed MOSFET gets way too hot August 03, 2017 09:22AM |
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Re: Heatbed MOSFET gets way too hot August 03, 2017 11:11AM |
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Re: Heatbed MOSFET gets way too hot August 03, 2017 10:40PM |
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Re: Heatbed MOSFET gets way too hot August 04, 2017 08:18AM |
Registered: 6 years ago Posts: 22 |
Quote
Roberts_Clif
See the Other Mosfet the pin has a black boarder completely around it,
The connection point is on the side of the board.
[attachment 96836 Image12.jpg]
Allow me to the other side of the board
Re: Heatbed MOSFET gets way too hot August 04, 2017 03:32PM |
Registered: 7 years ago Posts: 759 |
Re: Heatbed MOSFET gets way too hot August 04, 2017 04:26PM |
Registered: 6 years ago Posts: 22 |
Quote
obewan
Ok, so the pad on the bottom of the board is not needed for tha gate leg of the FET, the track the gate pin solders to is located on the top (component side) layer.hopefully you still have enough of this track left to solder too.
Re: Heatbed MOSFET gets way too hot August 05, 2017 07:59AM |
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Re: Heatbed MOSFET gets way too hot August 05, 2017 09:34AM |
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Re: Heatbed MOSFET gets way too hot August 05, 2017 06:23PM |
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Re: Heatbed MOSFET gets way too hot August 05, 2017 08:20PM |
Registered: 6 years ago Posts: 22 |
Quote
obewan
acording to the circuit, Q1 gate is connected to R32,
2 options . try scraping some of the white coating to see if you can uncover the broken track to connect too.
or maybe solder a wire between Q1 gate and R32. as in the pict.
Re: Heatbed MOSFET gets way too hot August 06, 2017 05:13AM |
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Re: Heatbed MOSFET gets way too hot August 06, 2017 07:03AM |
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'Quote
obewan
Hi, from the schematic.
R2 is connected from Q1 gate to GND,
Re: Heatbed MOSFET gets way too hot August 06, 2017 03:03PM |
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Re: Heatbed MOSFET gets way too hot August 06, 2017 07:13PM |
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Re: Heatbed MOSFET gets way too hot August 07, 2017 09:58AM |
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Re: Heatbed MOSFET gets way too hot August 07, 2017 03:13PM |
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Re: Heatbed MOSFET gets way too hot August 07, 2017 07:48PM |
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Re: Heatbed MOSFET gets way too hot August 08, 2017 08:36AM |
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Re: Heatbed MOSFET gets way too hot August 08, 2017 03:36PM |
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Re: Heatbed MOSFET gets way too hot August 08, 2017 03:58PM |
Registered: 6 years ago Posts: 22 |
Quote
obewan
Yes you can solder to any part of the copper you marked in red, you can solder the other end of the resistor direct to the leg of the FET gate leg if its easier.
Re: Heatbed MOSFET gets way too hot August 09, 2017 05:48AM |
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Re: Heatbed MOSFET gets way too hot August 09, 2017 08:16AM |
Registered: 6 years ago Posts: 22 |