LG refrigerator DH error code in-depth troubleshoot and repair.

LG refrigerator DH error code which is a symptom of defrost problem.
LG Model: LFX25971ST /1
LG 6615JB2005N Fuse and temperature sensor Assembly
Contents timeline:
00:11:29 - measuring defrost heater voltage
00:18:00 - removing freezer door and panel
00:38:58 - troubleshooting for problem
00:45:44 - changing thermal fuse
01:02:48 - re-install fuse connector
01:05:59 - re-install back panel
01:17:16 - re-install door
01:24:35 - verify defrost heater resistance from main board connector
01:26:24 - conclusion
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