#SKYWORTH LED TV model #58SUE9350F has a common fault where the TV gets stuck on the startup logo, then hangs and restarts automatically. This issue is usually caused by corrupted software or firmware failure.
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let’s break this down step-by-step so it’s easy to follow.
We’ll go over UC3842’s working principle, how protection mode works, why the main FET blows, and how to fix/cure the problem.
🔌 1. UC3842 Working Principle
The UC3842 is a PWM (Pulse Width Modulation) current-mode controller IC used in SMPS power supplies — common in LCD/LED TVs, adapters, and other electronics. Its main jobs are:
Generate PWM signals to drive the main MOSFET/FET.
Monitor voltage & current to keep the output stable.
Provide protection against overcurrent and under-voltage.
Key Pins & Roles
Pin
Name
Function
1
COMP
Error amplifier output — adjusts duty cycle.
2
VFB
Voltage feedback from output via optocoupler.
3
ISENSE
Current sense from shunt resistor — protects MOSFET.
