Address
304 North Cardinal
St. Dorchester Center, MA 02124
Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM
Repair of DELL 3421 laptop screen with dark screen and unlit backlight
1 pin EN is normal, 23 pin Vin has no voltage to ground resistance of 0 ohms. After tracing forward, it is found that a current limiting resistor is burned, and a small capacitor is short-circuited behind the current limiting resistor. Find a small resistor of 10 ohms and a small capacitor, and the boot is normal.