Sony TRINITRON KV-EX29K94 Service Manual page 6

KV-EX29K94/EX34K94
RM-965
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] IC6801
[V] D6806/D6801
[+B overcurrent ªOCPº]
[+B overvoltage ªOVPº]
[Vertical deflection failure]
[White balance failure]
[High voltage protector of Horizontal Deflection]
IC4301
RGB JUNGLE
OVP OCP
25 IKIN
20 XRAY
SDA
16
V PROT 1
CXA2100Q
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, Q6611 and Q6612. If Q6611 and Q6612 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
Q6811, Q6819, Q6820, Q6821 and D6801. 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 7 pin of IC6801 goes to High, the voltage to pin20 of
IC4301 go to UP. The unit will automatically turn off.
IC001
SYSTEM
3
SDA
6
LED 1 54
– 6 –
IC003
MEMORY
5