Fault phenomenon: No display after power on
Fault point: Converter
Detection tool: Multimeter
Verification program.
1. Detect whether the site voltage is normal
2. Detect whether the fuse, or lightning protection tube are normal
3. LCD line
Test results:
1. Voltage within the normal range ±15%
2. Fuse tube damaged
The lightning protection tube is damaged
3. After replacing the LCD cable, it still cannot operate normally
Treatment plan:
1. Replace the fuse tube
2. Return to the factory for repair