Skyworth LCD TV 26L08HR black screen sound normal maintenance record! - appliance repair - Huaqiang Electronic Network

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

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SMD aluminum electrolytic capacitor

Skyworth LCD TV 26L08HR black screen sound normal maintenance record!
model


Symptom: Black screen, normal sound!
Unpacking power test: 24V 16V 5V backlight control terminal voltage 3V Everything is normal!

Going back to the backlight circuit: the backlight circuit is controlled by two chips: OZ9939 OZ9982

OZ9939 2 feet are VCCOZ9982 1 foot is VCC. All are 5V power supply, power measurement, only 2V voltage. The cause of the fault was found!
Check the voltage regulator circuit is fruitless, the target is only these two chips, which is it? No matter what! lottery! First solder the OZ9982, power on, voltage 4.95V,
Haha! Hit the jackpot! The goal is found!
Replace the OZ9982 with power! The power supply voltage is normal!

Connect the lamp and you're done!