Read Sharp BD-HP21H (serv.man2) Service Manual online
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 21
Buzzing sound is generated near the power circuit.
Check if the rectifier diode and the circuit are causing short-circuit, or if the shunt regulator circuit is defective, in each rectifier circuit of the
secondary circuit (around D952, 953, 954, 955 and 951).
secondary circuit (around D952, 953, 954, 955 and 951).
FLOW CHART No.4