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HIOKI 3169-21/ Clamp on power hitester

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azemati:
Greeting
A friend of mine sent me a power HiTester HIOKI 3169-21 to repair.
When the device is turned on, only its back light is displayed and no information appears on the screen.
I searched many times and did not find the repair file of this device on the Internet
Does anyone have experience repairing this device?
can you help me?
Thank you

pasta2018:
mine is the same. I have replaced the battery,pressing “set up”or "file"button when power on,but nothing changed.Anyone can help? Thanks!

pasta2018:
I also checked bp5311A ,I found the output voltage is 31.15,and when I adjust the contrast,the output voltage didn't change. Could this be a problem?
Vin and Vctl is always 5V.

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