Self Diagnostic Block - Sony KV-32XBR400 Training Manual

Self Diagnostic Block

The Self-Diagnostic circuit is a program of the Main uCom IC on the A
board. This program monitors seven general faults that result in one or
more of the following:
♦ TV shutdown (AC relay is turned off);
♦ TV Latched OFF** (AC relay is held off); or
♦ A dark picture (no RGB signal).
As an indication of failure, the Main uCom blinks the Standby LED a num-
ber of times, pauses, then repeats.
Faults Monitored by Main uCom IC
Stby Symptom Bd
LED
Blinks
0 X Shutdown D
2 X Shutdown D
3 X Shutdown A
3 X Shutdown D
4 X Shutdown D
5 X Blanking C/A
/G2
adj
6X Shutdown A
7X Shutdown D
** TV latched OFF. Press power button twice to turn TV back on
Monitored Test point Normal
Circuit Voltage
(verification)
+200V Q8009/C 0.1Vdc
OCP (HV)
+135V CN6506/pin 0V
OCP 8
Unreg 7V D6017/C 0V
OVP
+135V CN6506/pin 0.1V
OVP 7
V Out CN5505/pin 0.78V
7
Loss
IK balance CN202/pin 8 3 pulses
in vertical
interval.
Set 5V IC6007/ 5.0Vdc
Output
OCP
H Out CN5505/pin 0V
OCP 8
73
OSD Diagnostics
In addition to the blinking Stby LED, the Main uCom records the number
of times the failure occurred. This is useful when the user complains of
an intermittent shutdown.
Access the Diagnostic Mode
To enter the test screen, first press these remote control buttons one at a
time: Display, 5, Vol —, Power On.
The screen will list the circuit monitored and the number of times the
failure has occurred.
Clear the OSD Diagnostic numbers
To clear the number of failures from the test screen press:
Press 8, Enter.
CN6506
Q8009
FBT
D Board
Front of TV
D6017
8
IC6007
10
CN5505
A Board
IC6007
I O G n/c