Sony KV-32XBR400, Training Manual

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73
Front of TV
D Board
FBT
CN6506
8
10
Q8009
D6017
IC6007
CN5505
A Board
IC6007
I O G n/c
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
LED
Blinks Symptom Bd Monitored
Circuit Test point
(verification)
Normal
Voltage
0 X Shutdown D +200V
OCP (HV) Q8009/C 0.1Vdc
2 X Shutdown D +135V
OCP CN6506/pin
8 0V
3 X Shutdown A Unreg 7V
OVP D6017/C 0V
3 X Shutdown D +135V
OVP CN6506/pin
7 0.1V
4 X Shutdown D V Out
Loss
CN5505/pin
7 0.78V
5 X Blanking C/A
/G2
adj IK balance CN202/pin 8 3 pulses
in vertical
interval.
6X Shutdown A Set 5V
OCP
IC6007/
Output 5.0Vdc
7X Shutdown D H Out
OCP CN5505/pin
8 0V
** TV latched OFF. Press power button twice to turn TV back on
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 .