Sony TRINITRON KV-DR34M97 Service Manual page 7

KV-DR34M97
RM-991
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
CRT (IK)
[H] D6825, D6830
[V] Q6819, R6832
[+B overcurrent ªOCPº]
[+B overvoltage ªOVPº]
[Vertical deflection failure]
[White balance failure]
[High voltage protector of Horizontal Deflection]
IC4301
RGB JUNGLE OVP OCP
58 IKIN
34
H PROT
SDA
35 V PROT
CXA2150AQ
Occurs when an overcurrent on the +B(135) line is detected by Q6610
and Q6609.
If Q6610 and Q6609 go to ON, the voltage to the pin3 of IC001 go to UP.
The unit will automatically turn off.
Occurs when an overvoltage on the +B(135) line is detected by D6635
and Q6611. If Q6611 go to ON, the voltage to pin6 of IC001 go to UP. The
unit will automatically turn off.
Occurs when an absence of the vertical deflection pulse is detected by
Q6819 and R6832. 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 IC4301.
TV will stay on, but there will be no picture.
Occurs when an overvoltage of horizontal pulse is detected by D6809 and
IC6801.
If the voltage of anode D6830, Q6800 and D6825 goes to High, the
voltage to pin34 of IC4301 go to UP. The unit will automatically turn off.
– 6 –
IC001
SYSTEM
3
SDA
6
54
LED 1
IC003
MEMORY
5