how to repair hand crank flashlight

A hand crank flashlight works by cranking a handle that connects to a gear box that spins the generator inside at a much higher speed thus generating electricity to charge its internal battery. This kind of flashlight is ideal for emergency situation where no extra battery or external power source is required.
In this video I'm going to show you how you can repair a hand crank flashlight that won't hold a charge.
Hope you like the video.
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Music in this video:
1. Alan Walker - Fade [NCS Release]
Music provided by NCS (No Copyright Sounds)
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2. Killing Time by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
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[@OP-fd4lh]

Very good demonstration of how to take apart and troubleshooting. Thank you!

[@leeseongleng2719]

Wow good can video how to repair older air con Tks

[@diyelectrovids6536]

I only know roughly how air con works. I didn't learn air con repair. Depends on what the fault is, mechanical fault or electrical and electronics fault. Main Mechanical components are:
Compressor
Condenser
Expansion valve
Evaporator
Make sure there's enough refrigerant gas inside the system.
Electronics controls the fan that blows cold air from the evaporator, the expansion valve to regualate refrigerant flow to evaporator and other components of the air con.
Hope that helps