Monster Power HTS 5100MKII Anormal Voltage, Help Please!

Greetings to all, I would like you to help me solve this problem, I have this Monster POWER that was working perfectly, I went to adjust the front brightness to stronger because it was very dim and when I increased the intensity, the Monster Power turned off, it starts to the blue CLEAN POWER ON light flashes and after three seconds the red ABNORMAL VOLTAGE light activates, it flashes for about 3 seconds and the CLEAN POWER ON option is activated again, thus remaining in a loop, three seconds in this option, it goes to the other for three seconds, any idea what's happening? Could you help me solve this problem? Thank you for reading.
 

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