en
cn
ru 
tr 
vie 
If your disinfection cabinet doesn’t start, has no display, won’t heat, or keeps shutting off randomly, the control board (PCB) is often the faulty part. Below is a step-by-step guide to safely test and replace it.
Safety First
Unplug the power cord or turn off the circuit breaker.
Wait 5–10 minutes for capacitors to discharge.
Prepare basic tools: screwdriver, multimeter, phone (for photo reference).
Part 1: How to Test the Control Board
Step 1: Visual Inspection
Check for burnt marks, swollen capacitors, broken traces, or loose components.
Look for loose or corroded connectors.
If obvious damage is seen, the board needs replacement.
Step 2: Test Input Power
Set multimeter to AC voltage mode.
Measure voltage at the board’s power input terminal.
Normal: 220V AC (or 110V per local standard).
No power → check power cord, door switch, or fuse first.
Step 3: Check the Fuse on the PCB
If the board has a glass or ceramic fuse, test for continuity.
No continuity → fuse blown.
Replace only with same-spec fuse. If it blows again, the board is shorted.
Step 4: Test Output Loads
Test output terminals for the:
Heating tube
Fan / ozone generator
UV lamp
No voltage output when the machine should run → control board defective.
Step 5: Check Touch Panel / Buttons
Unresponsive buttons or erratic operation often means a faulty main control board.
Conclusion: If power is good but the board does not control loads normally, replace the control board.
Part 2: How to Replace the Control Board
Step 1: Open the Disinfection Cabinet Cover
Remove outer screws (usually on the back or side).
Open the cover gently to avoid pulling wires.
Step 2: Take Photos of Wiring
Before disconnecting any wires, take clear photos of all connectors.
Label wires if needed to avoid mistakes.
Step 3: Disconnect All Connectors
Unplug wire harnesses one by one.
Do not pull wires directly — pull the plastic connector.
Step 4: Remove the Old Control Board
Unscrew mounting screws.
Take out the PCB carefully.
Step 5: Install the New Control Board
Place the new board in the same position.
Secure with screws.
Step 6: Reconnect Wires Exactly as Before
Follow your photos to plug each connector to the correct terminal.
Double-check no pins are bent or loose.
Step 7: Reassemble and Test
Close the cover and restore power.
Test functions:
Power on / display
Disinfection mode
Heating
Timing
Fan / UV / ozone
If everything works normally, the replacement is complete.
Important Tips
Use an original or compatible replacement board (same model number).
Do not use universal boards without checking voltage and connector layout.