Saturday, March 14, 2009

Sony TV KV-1982NG Power Supply Problem

Symptom: Dead set
Cure: Replace R602(220K ohm/0.5W)
Repair details:
No voltages measured at collector terminal of horizontal output transistor.
Voltage supply was measured across power supply filter capacitor terminals. Traced the PCB foil from the B+ terminal of the positive side of power supply filter capacitor to 220K ohm resistor(R602). B+ is measured on one side of the resistor R602 but no voltage measured on its other terminal. By using ohmmeter test it is found out that R602 is open-circuited.

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