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bigtreetech / BIGTREETECH-SKR-V1.3

32bit board with LPC1768, support marlin2.0 and smoothieware, support lcd2004/12864, On-board TMC2130 SPI interface and TMC2208 UART interface no additional wiring is required
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SKR 1.4 + TFT24 + DCDC MODE Short circuit between power supplies #552

Open gabinet2708 opened 2 years ago

gabinet2708 commented 2 years ago

Hello, i was testing my new skr 1.4 board with the TFT24 accessory (conected with the Serial and Exp1 and Exp2), works fine, after that i tried the DCDC MODE Power Supply (with the TFT24 Disconected and the NPWR jumper moved to VOT) everything works fine.

When i tried the TFT24 connected with the Serial and Exp1 and Exp2 and the DCDC Mode with the jumper moved to VOT, the capacitor C25 (near the inductor of the integrated 5v power supply) explode.

after some investigation i found what i think its a problem with the EXP1 and Serial (TFT Conector), When the jumper of the NPWR is on the VOT position the TFT Conector will be supplied with the VOT power form the DCDC MODE, On the EXP1 Conector the is supplied with 5v from the integrated power supply, On the TFT24 the 5v (from NPWR) will be the same conecction as the 5v (from the 5v on the EXP1)

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radek8 commented 2 years ago

You are probably right that two 5V sources will appear on the display. But if I connect two 5V sources it should not lead to a capacitor explosion. The cause must be another fault. I have the same connection that you describe only with the difference TFT35. I have no power problem.

radek8 commented 2 years ago

Did capacitor C25 really explode? Wasn't it a C26 condenser? Then it would look like a badly sized capacitor. Or the wrong batch. You are not alone to whom this happened and without an additional power supply module. https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/issues/556

guru-florida commented 2 years ago

I also discovered this and posted in Issue #403 .