Abnormal Voltage (Sub+5V Line); Abnormal Voltage (Main+3.3V Line) - Panasonic PT-50LCZ70 Service Manual

PT-50LCZ70 / PT-56LCZ70 / PT-61LCZ70 / PT-50LCZ7 / PT-56LCZ7 / PT-61LCZ7
[POWER Indicator three blinks]
IC6004 (TV MICROCONTROLLER)
[POWER Indicator four blinks]
IC6004 (TV MICROCONTROLLER)
[POWER Indicator six blinks]
IC6004
(TV MICROCONTROLLER)
[POWER Indicator seven blinks]
Communication error between Peaks (IC8001) and TV microcontroller (IC6004) detection circuit
IC6004
(TV MICROCONTROLLER)
Abnormal voltage (SUB+5V line) detection circuit
Normal
SOS
SUB+5V SENS
34
SOS: 0V on SUB+5V line
Abnormal voltage (MAIN+3.3V line) detection circuit
Normal
SOS
MAIN+3.3V SENS
57
SOS: 0V on MAIN+3.3V line
Audio Amp (IC4501) failure detection circuit
SOS
Normal
SOUND SOS (H)
72
SOS: Abnormal temperature for Audio amp (IC4501)
Normal
SOS
PANEL SOS (L)
48
SUB+5V
IC1107
+5V
2 1
REG.
MAIN P.C.B.
MAIN+3.3V
MAIN P.C.B.
Q4502
MAIN P.C.B.
MAIN P.C.B.
14
+9V
IC1104,
Q1106
DC-DC
+9V
CONVERTER
IC4501
(AUDIO POWER AMP)
SOUND SOS (L)
5
IC8001 (PEAKS)
PANEL SOS (L)
L6