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Patch on screen / one module is blank OR one module is flickering
Check if FRC cable of that module is loosen / disconnected. If No, then change that FRC cable.
If FRC cable is changed, still the issue is unresolved then check if 5V power is received at module by Digital Multimeter. If 5V is not received, change the 5V connector.
If power is received, FRC is replaced & still issue is unresolved, bypass that module & connect FRC to the next module. If it works, change the module which was blank initially.
Updated: 25 Jul 2018 01:54 AM
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Vertical patch on screen / one row of module is blank OR one row of module is flickering
Big patch on screen / one cabinet is blank OR one cabinet is flickering
Full screen is blank
Half / some part of screen is blank OR some part of screen is flickering
Full screen is flickering OR Color displayed on full screen is different