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In case one of the situations occurs follow these steps:
1. Disconnect all display panels from mains power.
2. Remove the rear protection cover.
3. Check if all connectors are fastened in the area where the LEDs are not working. Then reconnect the
display panels to mains power for testing.
4. If the problem still persists use a multimeter to test whether the AC and DC output voltage is steady. If
there is not output voltage or unsteady voltage replace the power adaptor: Plug out the connectors at
both ends of the power adaptor and remove the broken the broken power adaptor from its pocket. Insert
a now power adaptor and fasten the connectors with their locknuts.
5. Make sure that the new power adaptor is correctly connected and reconnect the display panels to mains
power for testing. Reattach the protective cover.
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