Power Failure Detection System - Sanyo PLV-80 Service Manual

Chassis Description

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 "MAIN_S-5V_PF", "GAM_12V_PF", etc. are
connected to the main power supplies and fans. When the failure occurs, IC801<CPU> receives an error information
through the power failure detection lines and turns off the signal "IC_RESET_CPU" output from pin 211 to stop the
power supply.
The power failure detection signals are sent to IC5871, IC5872<I/O EXPANDER> and then sent to IC801<CPU>
through the IIC bus line.
Diagnosis Information of Power Failure
IC5871
Detecting Signal Failure Circuit/Parts
MAIN_6V_PF 6V and peripheral circuit on the Main Board
MAIN_S-5V_PF S-5V and peripheral circuit on the Main Board
MAIN_3.3V_PF 3.3V and peripheral circuit on the Main Board
AD_3.3V_PF Failure of 3.3V_AD1, 3.3V_AD2, 3.3V_AD3, 3.3V_VD, 3.3VD_VD, IC261, IC9293, and
peripheral circuit on the Main Board
AD_5V_PF Failure of 5VA, 5V_VD, IC271 and peripheral circuit on the Main Board
PJNET_PF Failure of S6V, S5V and peripheral circuit on the I/F Board
S5V_AV_PF Failure of S5V and peripheral circuit on the AV Board
-5V_AV_PF Failure of S-5V and peripheral circuit on the AV Board
IC5872
Detecting Signal Failure Circuit/Parts
GAM_12V_PF Failure of 15V, IX1531 and peripheral circuit on the Main Board
GAM_5V_PF Faiure of 5VDAC, Q1551 and peripheral circuit on the Main Board
GAM_15.5V_PF Faiure of 15.5V, IC1541 and peripheral circuit on the Main Board
GAM_1.8V_PF Failure of 1.8VGA, IC491 and peripheral circuit on the Main Board
FPGA_1.5V_PF Failure of 1.5V_PLLA, 1.5V_PLLG, 1.5V_FPGA and FPGA<IC4401> peripheral circuit on
the Main Board
VDEC_1.8V_PF Failure of VD1.8, 1.8VD_VD, 1.8VA_VD, 1.8VL_VD and video A/D conversion circuit and
IC9201 peripheral circuit on the Main Board
M/A_PF Failure of 15.7V and motor drive circuit on the Drive Board.
FAN_PF Failure of Fan, FN901, FN902, FN905 connected to the Sub Power Board, or
Failure of Fan, FN903, FN904, FN906 connected to the Main Board
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