Measure resistance across AC input terminals. If low (under 10Ω), you likely have a shorted bridge rectifier or main FET. The manual’s flowchart directs you to desolder the FET (Q101) and test with a multimeter.
Small electrolytic capacitor near the PWM controller (value often 10–47µF / 50V). es-h126lla0 service manual
If you have obtained the PDF or physical copy of the manual, knowing how to navigate it is the first step to a successful repair. Measure resistance across AC input terminals
Per manual’s “Initial Check” list: es-h126lla0 service manual
If your unit isn't behaving, check these common fixes before calling a technician: