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Panasonic GH5 Viewfinder Repair - Issue: No switch on

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initialy the GH5 viewfinder (LVF) would not display anything when I looked through it, indicating a possible issue with the power supply or the internal connection to the viewfinder circuit. So i Opened the camera and inspected the flexible ribbon cable connected to the viewfinder PCB.

  • Identified a potential problem with the FPC connector, which appeared loose and damaged at the pin connection points.But i resolder it.

  • And i Tested the continuity of key components the power board,even the flex cable by cotinuity. 
     

  • After that, testing, the device did not power on at all, even after check the ribbon cable and ensuring the battery was functional.i have 3 diffrents.
     

  • Currently i'm thinking on check if  the power board (DC-in connector) has a short circuit or other internal faults that might have caused the system failure

    Does someone can confirm which part i have to test and which component maybe ?

    Can anyone confirm which specific components I should test further?

    Thank you!