Hisense LCD TV 42K431DX4F automatic shutdown fault repair example - home appliance repair
Source: InternetPublisher:三月小雨 Updated: 2021/11/03
When the Hisense 42K431DX4F LCD TV automatically shuts down
, test PS-ON/OFF=0V. It seems that there is a problem with the motherboard. Check the motherboard CPU power supply and there is no 1.25V. Next, check the DC-DC circuit U5 of the CPU. See 
the voltage at point C in the figure. From 0.8V to 2.7V, when point C is 2.7V, point D = 1.25V, and the CPU works normally. When the fault occurred, the voltage at point A was 5V, and the voltage at point B dropped rapidly and then slowly increased. It seemed that there was something wrong with D3. After replacing D3, everything was normal.
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