What does 'System Temperature High' mean on a Xiaomi Projector?

This error indicates blocked vents, dried thermal paste, or a failed cooling fan. The projector should not be restarted immediately and requires a thermal service to prevent laser damage.

Why are there white dots on my Xiaomi projector screen?

White or black dots indicate a failure of the DMD (Digital Micromirror Device) chip, often caused by overheating. The chip needs to be replaced to restore the image.

How do I fix vertical lines on the display?

Vertical lines usually point to a mainboard GPU fault or a damaged optical ribbon cable. This requires component-level motherboard repair or cable replacement.

Expert Engineering • Component Level Repair

4K Xiaomi Laser Projector Repair

Specialist diagnostics and repair for the Xiaomi Laser Projector 150", 4K Cinema, and Cinema 2. We address motherboard failures, DMD chip replacement, and cooling system overhauls.

Unlike general repair shops, we understand the ALPD 3.0/4.0 laser engine architecture and the specific power sequencing logic used by Xiaomi.

Serving the UK, Ireland & EU.

Book Repair

Xiaomi projector disassembly showing internal motherboard and laser engine

Complex internal architecture requires ESD-safe workshop handling.

Self-Diagnosis

Troubleshooting & Error Codes

Before booking, check if your issue corresponds to these common fault codes.

                
                            Symptom / Message
                            Likely Cause
                            Action Required
                        
                            "System Temperature Too High"
                            Blocked vents, dried thermal paste, or failed fan.
                            Do not restart immediately. Requires thermal service.
                        
                            Fan Error / Loud Noise
                            Bearing failure or tachometer sensor fault.
                            Fan replacement required.
                        
                            White/Black Dots on Screen
                            DMD Chip Failure (Micromirrors stuck).
                            DMD Chip Replacement (See below).
                        
                            Vertical Lines / Colour Bars
                            Mainboard GPU or Optical Ribbon Cable fault.
                            Component level motherboard repair.
                        
                            No Power / Dead
                            Power Supply Unit (PSU) or Mainboard Short.
                            Voltage rail diagnostics required.

Symptom / Message	Likely Cause	Action Required
"System Temperature Too High"	Blocked vents, dried thermal paste, or failed fan.	Do not restart immediately. Requires thermal service.
Fan Error / Loud Noise	Bearing failure or tachometer sensor fault.	Fan replacement required.
White/Black Dots on Screen	DMD Chip Failure (Micromirrors stuck).	DMD Chip Replacement (See below).
Vertical Lines / Colour Bars	Mainboard GPU or Optical Ribbon Cable fault.	Component level motherboard repair.
No Power / Dead	Power Supply Unit (PSU) or Mainboard Short.	Voltage rail diagnostics required.

Xiaomi DMD chip assembly showing the optical block interface

The DMD chip is the "retina" of your projector. Replacing it requires deep optical block disassembly.

DMD Chip Failure (White Dots)

If your screen looks like a starry night sky with stuck white or black pixels, your Digital Micromirror Device (DMD) has failed. This is common in units that have run hot for extended periods.

Our Solution: We strip the optical block, replace the DMD chip with a genuine part, replace the thermal pad interface, and realign the optics to ensure sharpness across the entire image.

Eliminates dead pixels.
Restores native 4K/1080p resolution sharpness.
Includes thermal upgrade to prevent recurrence.

Vertical Lines & Display Artifacts

Vertical bands, coloured stripes, or a split-screen effect often indicate a failure in the signal path between the mainboard and the optical engine. This can be caused by heat stress on ribbon cables or a BGA (Ball Grid Array) fracture on the graphics processor.

Our Solution: We test the LVDS/ribbon cables for continuity. If the cables are healthy, we perform board-level reflow or reballing of the main processor to restore connection integrity.

Projector screen showing vertical lines and graphical corruption

Vertical lines are rarely a "settings" issue; they indicate hardware signal failure.

Rear input ports of a Xiaomi Laser Projector including HDMI and USB

Loose or damaged HDMI ports prevent the 'handshake' required for 4K HDR content.

HDMI Port & Connectivity Repair

"No Signal" messages often stem from physically damaged HDMI ports. Constant plugging and unplugging can break the solder joints connecting the port to the mainboard.

Our Solution: We do not just reflow the old solder. We remove the damaged port, clean the pads, and solder a new, reinforced HDMI port to the mainboard to ensure a stable 4K 60Hz HDR connection.

Fixes "No Signal" / Intermittent dropouts.
Restores ARC/eARC functionality.
Reinforced soldering for durability.

Expert Repair for Your Premium Projector

Don't risk your 4K Laser TV with general electronics shops. We have the parts, the schematics, and the experience to fix it right.

Book Repair Now Call UK: 0333 006 4327