Sony KLV-40W652D TURNS OFF
The customer reported that the SONY KLV-40W652D seat turned off automatically while driving. In the workshop, the seat functioned properly, so I began fault finding. All main board voltages were correct, but the five-volt supply was slightly high at 5.20 volts. After isolating and checking the resistance, I discovered a defective resistor in the voltage divider feedback line, which caused the instability. Replacing the faulty resistor stabilised the voltage at five volts, and subsequent tests confirmed the seat was fixed.
Feedback voltage divider resistances
10K resistor
1.8K resistor
2.2K resistor
Faulty resistor > 10K
