Skyworth 37k05hr black screen with sound fault repair

Reprint 1:

After a new machine Skyworth 37l05hr,1 years, just over-insured. Boot image sound Normal, put 10 minutes or so black screen. Sound is normal. Turn off the machine again to open the normal. A black screen appears in 2 minutes. In the warranty period, the sale after two times this type of failure has not been cured. Demolition Test 5V 12V 24V are normal, high-voltage plate drive chip is H3435 normal time measured once voltage, and black screen when measured voltage contrast, found 16 feet black screen when the voltage rise to 3.7V, this foot voltage higher than 3.5V protection of high-pressure plate does not work, with a 2.7V regulator tube connected to 16 feet, Boot everything is OK. The test machine does not appear black screen one day. Skyworth 32L05 model will also appear this kind of fault, in 16 feet after a 2.2-2.7 regulator tube is done, there is a method in the C28 capacitor parallel resistor (18-20k) can also be ruled out such a fault.

After-Sales technical transformation Program is also in 16 feet plus 2.7V Voltage Regulator tube

Reprint 2:

Backlight oscillator circuit IC for str-h3435, by changing the input pulse signal 8 feet change the benchmark setting, that is, through the size of the 8-foot external resistor to control the IC internal comparison voltage threshold to change the protection circuit false. Practical Circuit Retrofit: Scenario 1. can be achieved by adding a 6.8K resistor to the 8-foot R25 (33k). Scenario 2. Remove R24 (120K). Two solutions select only one line. The above maintenance cases are for reference only, the concrete situation concrete analysis.

Skyworth 37k05hr black screen with sound fault repair