# MYJG power supply external LCD screen **URL:** \ **Category:** Laser Power Supply\ **Created:** [April 9, 2021, 9:29am UTC](https://forum.cloudray.com/t/myjg-power-supply-external-lcd-screen/229 "2021-04-09T09:29:39Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Technician](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/technician/32/15_2.png) [@Technician](https://forum.cloudray.com/u/Technician)\ **Post date:** [April 9, 2021, 9:29am UTC](https://forum.cloudray.com/t/myjg-power-supply-external-lcd-screen/229/1 "2021-04-09T09:29:39Z")
![image](https://us1.discourse-cdn.com/flex020/uploads/cloudray/original/1X/204ce4e1dc43c3c58e8529ca883ae46aae24e00b.jpeg) After MYJG100W and 150W are connected to the power supply, the switch rotates to the right, and there is a trimmer potentiometer on the LCD screen to adjust the current. If you turn it to the left, the LCD screen displays normally, and the potentiometer does not work. Note: The external LCD screen of MYJG60W and 80W power supply can only display current information, and cannot adjust the current. ---
**Author:** ![Geppoinfallo](https://avatars.discourse-cdn.com/v4/letter/g/f19dbf/32.png) [@Geppoinfallo](https://forum.cloudray.com/u/Geppoinfallo)\ **Post date:** [January 19, 2022, 1:52am UTC](https://forum.cloudray.com/t/myjg-power-supply-external-lcd-screen/229/2 "2022-01-19T01:52:18Z")
hi, my power supply has no power, what is the correct connection with external lcd? I moved the switch to the right and connected only the external display. by pressing the test key the mA always remain at zero. ---
**Author:** ![Geppoinfallo](https://avatars.discourse-cdn.com/v4/letter/g/f19dbf/32.png) [@Geppoinfallo](https://forum.cloudray.com/u/Geppoinfallo)\ **Post date:** [January 19, 2022, 9:15am UTC](https://forum.cloudray.com/t/myjg-power-supply-external-lcd-screen/229/3 "2022-01-19T09:15:22Z")
hi, I’ve already tried and it doesn’t work, does it necessarily need other connections to test it?