Wanhao D7 FAQ’s

This page contains a lot of the common questions and answers related to the D7 Resin printer. If you have a question would like answered or have information that you would like to add to the Faq page, use the request form to send the information.


LCD does not show anything and there is a blinking light on the HDMI board

When the light on the HDMI board is blinking that means the board is not receiving any signal from the computer (or RaspberryPi).

  • Check that the HDMI cable is connected securely
  • Check that the PC is showing a second display. If it does not check the cables.
  • Check the short HDMI male to female cable inside the D7 has not come loose. You can always try and bypassing this cable by plugging the HDMI from the PC directly into the HDMI driver board.
LCD is showing a split image or ghosting

The LCD module is very fragile and many units have been delivered with the LCD damaged during shipping. Check this page for photos and suggestions. The newest D7 units are now shipping with an acrylic backing plate on the LCD to help protect it.

  • If the LCD shows a white circle when the UV is turned on (issue gcode M106 or use CW / NanoDLP to turn on the UV Lamp) then it could have been damaged by pressure on that spot.
  • If the LCD is showing half an image longways then the LCD cables could be loose. Carefully check them with instructions from this page.
  • Check that the orientation of the secondary screen on the PC (if using Creation Workshop) is set to Landscape.
Need custom button actions in Nanodlp

You can add your own buttons to the nanodlp webpage to do various things like move up 10mm or agitate the resin. See this Customized Buttons page for more information on how to accomplish this.

Power Supply and Main board LED Blinks (and UV does not work)


Some customer received the printer and found both the PSU LED light and Motherboard LED
light blink. The motherboard blinks indicate there’s short circuit which triggers the protection
procedure. Therefore to find the short point and fix it would fix the issue.


The metal tabs on the UV LED are very close to the metal heat sink and have a possibility of shorting out. You can slightly bend the tabs (where the power wires are soldered on) up to get them further away from the heat sink. See the video below for an explanation.

The Power button is blinking or not coming on

The first batch of printers were shipped with a power supply that was later determined to have issues.

  • Check that the power supply is labeled MW (MeanWell). If it is not then it may be an earlier weak power supply.
  • Check the power cord and make sure it is plugged in securely.
  • If the power light on the front switch is blinking then the power supply is shorting or not sufficient to run the unit.
  • Replace the power supply with new 12V 5amp or greater supply.
X and Y Size are off when using CW


The initial bed / LCD size was set incorrectly in CW for the D7.


CW appears to calculate the x and y microns using the dimensions entered and the configured x / y resolution so having the bed (LCD size) size set wrong will throw off the calculations. Nanodlp you enter then directly. The older version of nanodlp would use one value for both x and y. After upgrading and going into setup it will want you to enter a value for Y, I just coped the X over to Y. Assuming the CW settings are exact, this works out to 46.875 microns for X and 47.222 for Y. Formula is LCD mm * 1000 / LCD Resolution, i.e.: 68mm*1000/1440 = 47.222

In CW adjust the Build Size to 120 x 68 and make sure the resolution is 2560×1440. Nanodlp still requires you to enter in the values for X and Y microns directly (use the formula above).



Source :


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