SU And SD Board Shift Registers.......................................................................... 35
SS Board Explanation................................................................................................. 37
SS Board Schematic.............................................................................................. 38
SS Board Waveform .............................................................................................. 38
TH-42/50PX500U.......................................................................................................... 40
Power LED Flashing timing chart .............................................................................. 40
SOS Detection Circuits...............................................................................................41
SOS Detect (D Board)............................................................................................ 41
SOS Detect (DG Board).........................................................................................41
SOS Detect (D and PA Board)............................................................................... 42
PA Board SOS Detection Circuits..............................................................................43
Over-Voltage Detection of Main Voltage (10 Blinks) .............................................. 43
Short Circuit Detection of Main Voltage (10 Blinks)................................................ 44
Short Circuit Detection of Sub-voltage (10 Blinks) ................................................. 45
Other SOS Detection Circuits ....................................................................................46
SOS Detect (P, SC, and SS Board) ....................................................................... 46
P Board SOS Detection .........................................................................................47
Voltage Distribution of the PA board and SOS Detection ....................................... 48
Z Board (Sound) SOS Detection ............................................................................... 50
TH-42/50PX500U Self-check Function (Reset)..........................................................51
Diagnostic Procedures........................................................................................... 51
How to access the Self-check Screen (Reset)....................................................... 51
How to exit the Self-check Screen .........................................................................51
Screen Display......................................................................................................... 51
TH-42PD50U................................................................................................................. 53
Power LED Flashing timing chart .............................................................................. 53
TH-42/50PD50U Self-check Function......................................................................... 54
Diagnostic Procedures........................................................................................... 54
How to access the Self-check Screen (Reset)....................................................... 54
How to exit the Self-check Screen .........................................................................54
Screen Display......................................................................................................... 54
Serviceman Mode........................................................................................................56
How to enter the Serviceman Mode.......................................................................56
Adjustment method ................................................................................................ 56
Cancellation ........................................................................................................... 56
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