Sony TRINITRON KV-PG21P10 Service Manual page 6

KV-PG21P10
RM-952
5. HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic
screen during repairs. When you have completed the repairs, clear the result display to "0".
Unless the result display is cleared to "0", the self-diagnostic function will not be able to detect subsequent faults after
completion of the repairs.
[Clearing the result display]
To clear the result display to "0", press buttons on the remote commander sequentially as shown below when the
diagnostic screen is being displayed.
Channel [8] / 0
[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
6. SELF-DIAGNOSTIC CIRCUIT
FROM
[+B] Q500
[+B overcurrent ªOCPº]
[Vertical deflection stopped]
[White balance failure]
IC301
Y/CHROMA JUNGLE
[V]
D553
MP/
50
PROTECT
SDA 35
Occurs when an overcurrent on the +B(135) line is detected by Q500. If Q604 go to
ON and the voltage to pin 50 of IC301 more than 3.5V when V.SYNC is more than
seven verticals in a period, the unit will automatically turn off.
Occurs when an absence of the vertical deflection pulse is detected by Pin 17 and
IC001 shut down the power supply.
If the RGB levels* do not balance or become low level within 5 seconds, this error
will be detected by IC301. TV will stay on, but there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
IC001
SYSTEM
53
IO-8DAT
17
51
O-LED
54 IO-SDAT
– 6 –
IC003
MEMORY
5 B-DAT