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2) Abnormality occurs on drive signals for power or lamp circuit.
●
Abnormality on power starter signals (POWER, 5V_SW).
• POWER signal is output from pin 1 of IC801 and sent to pin 17 of IC1881, and
output from pin 3 by the name of 5V_SW signal. 5V_SW signal drives 15.5V and
9VMCI power supply circuits on the power board.
POWER/5V_SW ................................... High in power on
• Check POWER and 5V_SW signals, 9V regulator circuit Q65A, Q65B, Q65C, IC65A
and peripheral circuit, 15.5V switch circuit Q661, Q662 and peripheral circuit on
the Power Board.
●
Abnormality on lamp ballast drive signal (BALLAST_AC).
• BALLAST_AC signal is output from pin 39 of IC801 and sent to pin 11 of IC1881,
and output from pin 9 by the name of BALLAST_AC1 signal. BALLAST_SW1 signal
drives the lamp ballast unit.
• Check BALLAST_AC and BALLAST_AC1 signals and lamp ballast unit.
●
Abnormality on fan drive signal (FAN DRIVE).
• FAN DRIVE signal is output from pin 41 of IC801 and sent to pin 15 of IC1881, and
output from pin 5 by the name of FAN DRIVE1 signal. FAN DRIVE1 signal drives
fan supply voltages (12V/12V1) on the power board.
FAN DRIVE/FAN DRIVE1..................... High in power on
• Check FAN DRIVE/FAN DRIVE1 signals, 12V regulator circuits IC661, Q681,
Q682, Q66A, IC671, Q671, Q672 and peripheral circuits.
●
Abnormality on power drive signal (LAMP_BST_SW).
• LAMP_BST_SW signal is output from pin 82 of IC801 and sent to pin 2 of IC1871,
and output from pin 18 by the name of LAMP_BST_SW1 signal. LAMP_BST_SW1
signal drives the power factor control IC on the P.F. board through the Power board.
LAMP_BST_SW/LAMP_BST_SW1 ......... High in power on
• Check LAMP_BST_SW and LAMP_BST_SW1 signal, photo-coupler PC643,
transistors Q651, Q652 and peripheral circuits.
3) Abnormality occurs on the power circuit.
●
Abnormality on power primary circuit
• Check Line filters, L601, L602, D614, L611, IC631, D632, etc.
●
Abnormality on power secondary circuit
• Check D651, D652, D653, IC651, etc.
Part 4: Troubleshooting
4-2
Содержание LV-7355J
Страница 9: ...Part 1 General Information ...
Страница 22: ...Part 2 Repair Information ...
Страница 43: ...Part 3 Adjustment ...
Страница 65: ...Part 4 Troubleshooting ...
Страница 82: ...Part 4 Troubleshooting 4 17 BA7078AF Selector IC6241 CXA2101AQ RGB Matrix IC4101 ...
Страница 83: ...Part 4 Troubleshooting 4 18 CXD2064Q Digital Comb Filter IC2101 L3E01031 Level Shift IC3501 IC3531 IC3561 ...
Страница 85: ...Part 4 Troubleshooting 4 20 ML60851 USB I F IC9801 M62393 D A IC2571 ...
Страница 86: ...Part 4 Troubleshooting 4 21 TB1274AF Video Decoder IC1101 TA1318N AFC Detector IC6171 ...
Страница 87: ...Part 4 Troubleshooting 4 22 FA7612CA PWC Controller IC65A IC671 IC681 STR Z2156 Switching Controller IC631 ...
Страница 88: ...Part 5 Parts Catalog ...
Страница 89: ......
Страница 107: ...Part 6 Electrical Diagrams ...
Страница 117: ......