Toshiba TW40F80 - Manual (Page 42)

42
4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS
PROCEDURES
4-1. Left Screen Picture Failure in Normal Mode/Double Window Modes
(No Picture, Sync Distributed)
Picture fallure
(Normal/DW mode)
Super live
mode OK?
Output at pins 5 , 6 ,
7 of PX02 OK?
LX18 adjustment
OK?
Readjustment
QX01 input / output
OK?
Replace
E 2 PROM OK?
Check associated
circuit (Tr.etc).
END
I 2 C bus pin 7 , 8
of PX01 OK?
Is clock at pin 47
of QX01 OK?
Signals at pins 5 , 6 ,
7 of PX02 OK?
Output at pin 3 (HD)
of PX02 OK?
Receive circuit check.
Check circuits other
than WAC unit.
Check around
of QX03.
Check around
QX02.
Replace QX01.
Check receive
circuit.
I 2 C bus line check.
N
N
N
N Y
Y
N
N
Y
Y
N
Y
N
Y
Y
Y