SHARP _ LCD TV _ LC-32SH25E _ Power Supply Troubleshooting

                                            Power unit operation check

Are the power cord and harness in the unit properly connected? => NO => Connect the power cord and harness properly, and turn on the power.

If Yes

Is F901normal? => NO => LINE_FILTER_UNIT: Isn't L901,L902,RV901,C903,C904,C901,C902, etc. out of order? Moreover, whether the short-circuit with the circumference circuit is checked.

POWER_UNIT: BD901, RV902, IC951, etc. out of order? Moreover, whether the short-circuit with the circumference circuit is checked.

If Yes

Is BD901 (+320V) output? (Set the main power SW to OFF.) * When power on/off switch is on -> About +400V => NO => Does the PFC circuit operate normally? (L906, Q901, D902, D903, IC901 and etc. And, the circuit around the protection circuit etc. is checked.)

If Yes

Is a voltage of +5V applied to pin (11,12) of connector (CN902)?

(Set the main power SW to OFF.) => NO => Does the switching circuit operate normally? Check circuit around the primary side (T901, IC931, Q931, ZD981, ZD930, D980, D981, ZD981, etc.), the secondary side (D935, L980, etc.), the AC_DET circuit (ZD982, IC932, IC982, Q992, Q993, etc.), and the protection circuit.

If Yes

Are +24V output as for the power on/off switch when it is on? => No => Does the inverter circuit operate normally? Check circuit around the primary side (T902,Q951,Q952,IC951,

D951,D952, etc.), the secondary side (D955, L971, ZD967, IC952, IC953, etc.), the STANDBY circuit (Q988, etc.), and the protection circuit.

If Yes

Similarly, is +12V output as for the power on/off switch when it is on? NO => Check +12V circuit of D956, L931, etc.