Author Topic: Hyelec HY5003B no displays  (Read 1883 times)

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Offline ResRTopic starter

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Hyelec HY5003B no displays
« on: February 13, 2022, 01:40:24 pm »
I turned on the mains input power one day and power supply no longer has neither voltage or current display working, but both knobs does control both voltage and current output and the three 3mm LED's are operational, showing output state and CV or CC state. Nothing seemed to be burned as far as I could see inside, didn't find any blown fuses either.
 

Offline ResRTopic starter

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Re: Hyelec HY5003B no displays
« Reply #1 on: August 15, 2022, 02:54:41 pm »
Got some free time to take it apart again carefully and fixed, found a faulty zener diode at the upper right corner of the display board that pulled one of the voltage rails below operating voltage, temporary replaced with a bulb._
 


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