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Troubleshooting
NO POWER
1. Is fuse (F901) blown?
Fuse may be opened when either the LAMP
POWER indicator or the READY indicator(with the
front indicators) isn't Illuminated. Check the fuse.
●
For continued safety, replace with a fuse of the
same type.
TYPE T8AH 250V FUSE. (LITTLE FUSE INC.
TYPE 215008)
2. Is projection of lamp cover inside broken or not fit-
ting?
Check the INTER LOCK switch(SW902) and lamp
cover.
SW902 ......................................... OPEN : abnormal
3. Is thermal switch(SW903) operating?
If temperatures periphery of lamp is reached to
100˚C, the thermal switch will be turned off automat-
ically.
SW903 ......................................... OPEN : abnormal
4. Is thermal switch(SW904) operating? (with the TEM-
PERATURE WARNING INDICATOR flashing)?
If temperatures periphery of LCD panel is reach ed
to 50˚C, the thermal switch will be turned off auto-
matically.
SW904 ......................................... OPEN : abnormal
5. Check Temp sensor IC(IC5851) peripheral circuit.
1. Are the LAMP POWER indicator(red) and READY
indicator(green) light? (Front indicators)
If the LAMP POWER and READY indicators do not
light, check the HOT circuit of primary side and S5V
of STANDBY power source circuits.
2. Check the AC 100/200 switching circuit is correct.
3. Check that the FAN DRIVE signal is correct.
Pin4 of K6K ................................................... L : ON
4. Check that the LAMP ON/OFF signal is correct.
Pin8 of K6E, pin5 of K6K .............................. H : ON
5. Check that the POWER FAIL signal is correct.
Pin3 of K6K .......................................... L : abnormal
6. Check that the +6V voltage is correct.
..........................................................Pin7, 8 of K6J
7. Is thermal switch(TSW601) operating?
If temperatures periphery of P.F.C. circuit is reached
to 85˚C, the thermal switch will be turned off auto-
matically.
TSW601 .................................... SHORT : abnormal
8. Check the signal at pin5 of T631. (Switching power
IC output signal)
9. Check IC6601 peripheral circuit.
IC6601, Q6603, Q6604, Q6606
POWER, SUB POWER BOARD
PERIPHERY OF CHASSIS
1. Check that the fan drive power supplies are correct.
K76A1-2 .............................................. 16-17Vdc
TP7601 ................................................ 12Vdc
TP7602 ................................................ 12Vdc
TP7603 ................................................ 12Vdc
2. Check that the FAN DRIVE signal is correct.
K76A 9 .............................................. H : Normal
3. Check that the POWER FAIL signal is correct.
K76A-2 ................................................. L : abnormal
4. Check Temp sensor IC(IC7608) peripheral circuit.
1. Check that the Vcc-voltage(S5V) is correct.
2. Check that the POWER FAIL signal is correct.
Pin17 of K58A, pin3 of K56B ............... L : abnormal
3. Check that the LAMP MONITOR signal is correct.
Pin2 of K56C, pin16 of K58A .............. H : abnormal
4. Check that the FAN DRIVE signal is correct.
Pin27 of IC5801, pin4 of K56B ..................... H : ON
5. Check that the LAMP ON/OFF signal is correct.
Pin5 of K56B, pin14 of K58A ........................ H : ON
6. Check that the POWER ON/OFF signal is correct.
Pin26 of IC5801 ............................................ H : ON
1. Check that the Vcc-voltage(IC801/IC809 +S5V) is
correct.
2. Check that the POWER FAIL signal is correct.
Pin125 of IC801 ................................... L : abnormal
3. Check that the TEMP. MONITOR signal is correct.
Pin24 of IC809, pin3 of K8E ................ L : abnormal
4. Check that the TEMP. DET. signal is correct.
Pin23 of IC809, pin1 of K8M................ L : abnormal
5. Check that the LAMP MONITOR signal is correct.
pin122 of IC801, pin16 of K8A ............ H : abnormal
6. Is POWER ON signal in lamp power on/off button
input at pin119 of IC801 ?
7. Is POWER ON signal in remote-control unit input at
pin143 of IC801?
8. Check that the LAMP ON/OFF signal is correct.
Pin144 of IC801, E Q1875, pin14 of K8A ..... H : ON
MAIN BOARD
MOTHER BOARD
FAN CONTROL BOARD
Summary of Contents for PLC-EF12B
Page 55: ... 55 IC Block Diagrams AV9155C OSC IC3301 IC3321 CIP3250A Component Interface Processor IC102 ...
Page 58: ... 58 IC Block Diagrams ML60851ATB USB Controller IC3801 MPC948FA Clock Driver IC3341 ...
Page 59: ... 59 IC Block Diagrams M62358FP DAC IC1401 VPC3215C Digital Video Processor IC101 ...
Page 60: ... 60 IC Block Diagrams MB40988PFQ D A Converter IC1181 MSM54V16258 DRAM IC2301 IC2311 ...
Page 61: ... 61 IC Block Diagrams CXA2016S Sync Separator IC4141 TC4052BF Sync Separator IC4141 ...
Page 66: ... 66 TDA8395T SECAM Decoder IC6103 IC Block Diagrams ...
Page 111: ...M6V EF12N00 NL00 PLC EF12E 00 EL 00 PLC EF12B 00 111 ...
Page 112: ... M6VAC Feb 2001 2000 SI Printed in Japan SANYO Electric Co Ltd ...
