Lenovo V15 g2 ALC no backlight

[djob1981]

Got no backlight on this laptop, checked fv1 fuse was bad so replaced it with a new one and replaced the shorted cap next to it and l aso replaced the lcd cable as pin3 on the cable was burned. I now get 20v at those pins and get an image on ther laptop screen but still no backlight.checked fa2 fuse and is fine but gets no volts(unsure if this is right) and has a 0.33v drop to ground when testing ..

Anyone got ideas where else i should look

[djob1981]

also tried 3 screens same issue

[tomodachi]

Did you make sure +LCDVDD voltage is present ?

[djob1981]

Did you make sure +LCDVDD voltage is present ?

uv1 has no voltage on input side with just charger plugged in and board out of laptop

[djob1981]

When turned on pin 1 on uv1 fluctuates, pin 4 get 3.3, pin 5 has 1.8v, pin 3 is 3.3v

[djob1981]

fa2 fuse gets a solid 3.3v when turned on and fv1 20v

[rogfanther]

Measure resistance to GND on pin 5

[djob1981]

Measure resistance to GND on pin 5

i get 94.5k on pin 5 of uv1