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Troubleshooting
Power failure detection system
Detection of power failure
Projector provides a protection circuit to prevent the secondary failure when the power failure, fans failure or tem-
perature failure occurs on the projector. The power failure detection lines "PF_AV", "PF_S3.3V", etc. are connected
to the power supply lines and fans. When the failure occurs, IC301<Scaler> receives an error information through the
ICs<I/O EXPANDER> and then outputs the signal "PFC_SW" from pin 28 of IC5201 to stop the power supply.
Error information table
IC
Pin
Signal Name
4
PF_AV
5
PF_MOTHER
6
PF_AD
IC4801
7
PF_F_FPGA
10
PF_PIC
11
PF_LAN
12
PF_25V
4
PF_I/O
5
PF_S16
6
PF_S3.3V
7
PF_F_MOTOR
IC4811
9
PF_KEY
11
PF_GAM
12
PF_S-5V
27
PF_PFC12
28
PF_PFC34
29
PF_EX_L1
30
PF_EX_L2
31
PF_EX_L3
32
PF_EX_L4
42
PF_EX_MR
43
PF_IN_L1
IC5681
(DC
44
PF_IN_L2
POWER)
45
PF_IN_L3
53
PF_IN_L4
54
PF_B1
55
PF_B2
56
PF_R1
58
PF_G1
59
PF_G2
62
PF_PBS
63
PF_S5V
65
PF_PFC1
IC1801
66
PF_PFC2
67
PF_PFC3
68
PF_PFC4
305
POSITION_DET1
IC3401
354
POSITION_DET2
414
PRESS_SENS
IC301
499
WINDS_SENS
SLOT1_SDA/SLOT1_SCL
-
SLOT2_SDA/SLOT2_SCL
-
Connection Lines
S3.3VAV, 1.2VAF, S5V_
AVD, S3.3VSI, S1.2VSI,
S3.3VTME, 5V
S3.3VMF, 1.2VMF,
S2.5VMF, 5V_BUF, S9.6V
S3.3VADA, 1.8VA, 2.5V_
ADA
3.3VFFA, 1.2VFFA,
3.3VFFB, 1.2VFFB
S1.2V_PC1D, S2.5V_
PIC1A, 3.0V_PIC1
3.3V_LAN
25V
S3.3V_I/O, S2.5V_USB
S16V
S3.3V
S12V
1.8V_KEY,3.3V_KEY,
2.5V_KEY, 3.3VBF,
2.5VBF,1.2VBF
HVDD,VVDD,15V_SHR,
15V_SHG, 1.8V_DDR,
1.0V_DDR
S-5V
FN907
FN909
FN910
FN911
FN912
FN913
FN914
FN915
FN916
FN917
FN918
FN901
FN902
FN903
FN904
FN905
FN906
S5V
PFC1
PFC2
PFC3
PFC4
POSITION_DET1
POSITION_DET2
PRESS_SENS
WINDS_SENS
IIC
IIC
-170-
Error Information
Failure Area
AV,
AV
Power supplies on AV
MOTHER, MOTHER
Power supplies on mother
MAIN,
AD
AD circuit power supplies on main
MAIN,
F_FPGA
Front FPGA circuit power supplies on main
MAIN,
PIC
PIC circuit power supplies on main
RS232C,
LAN
LAN power supplies on RS232C
MAIN,
25V
25V power supply on main
S3.3V_I/O, S2.5V_USB power supplies on
MAIN,
I/O
main
MAIN,
S16V
S16V power supply on main
MAIN,
S3.3V
S3.3V power supply on main
MAIN,
S12V
S12V power supply on main
MAIN, KEYSTONE
Keystone power supplies on main
MAIN,
GAMMA
Gamma circuit power supplies on main
MAIN,
S-5V
S-5V power supply on main
FAN. PFC12 COOL
12VFAN3 and FN907
FAN, PFC34 COOL
12VFAN2 and FN909
FAN,
LAMP1 EX
12VFAN1 and FN910
FAN,
LAMP2 EX
12VFAN1 and FN911
FAN,
LAMP3 EX
12VFAN1 and FN912
FAN.
LAMP4 EX
12VFAN3 and FN913
FAN, MIRROR EX
12VFAN3 and FN914
FAN,
LAMP1 IN
12VFAN2 and FN915
FAN,
LAMP2 IN
12VFAN2 and FN916
FAN,
LAMP3 IN
12VFAN2 and FN917
FAN,
LAMP4 IN
12VFAN2 and FN918
FAN,
PNL B IN1
24VFAN1 and FN901
FAN,
PNL B IN2
24VFAN2 and FN902
FAN,
PNL R IN1
24VFAN5 and FN903
FAN,
PNL G IN1
24VFAN3 and FN904
FAN,
PNL G IN2
24VFAN4 and FN905
FAN,
PBS IN
24VFAN6 and FN906
MAIN,
S5V
S5V power supply on main
PFC,
PFC1
PFC1 error on PFC1
PFC,
PFC2
PFC2 error on PFC1
PFC,
PFC3
PFC3 error on PFC2
PFC,
PFC4
PFC4 error on PFC2
ERR, SHUT_MTR
Shutter motor error detection
ERR, PRESSURE
IC886 (Pressure sensor) error detection
ERR,
FILTER
S901 (Widow Sensor) error detection
SLOT3
Slot1(3) error
SLOT4
Slot2(4) error
LX1750 Service Manual
020-000643-01 Rev.1 (01-2014)
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