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Dead Set Start
Troubleshooting


Measure Pin 3
of CON 2 for
+5Vdc.




BK001
Suspect Main
+5V present? NO
SMPS Function DC Voltage
Power 2.7
Channel + 1.4
YES
Channel - 0.84
Volume + 2.2
Press Pow er Volume - 1.8
Switch, monitor
CON 3 Pin 7 for Menu 2.5
+5V No Key Press 2.9


Using the chart to the right,
verify the correct voltage on
+5V present? NO
pin 6 of BK001 for each FPA key
press.


YES


Check CON 3
Voltages
Pin 1 for +12V YES
Correct? NO
Pins 5/6 for +24V




Troubleshoot
Suspect Main Voltages Troubleshoot
NO FPA and Key
SMPS Correct? Digital Board
scan circuit



YES


Monitor BP700 for the following
voltages.
Pins 1/2 for +5V
Pin 4 for +8.6V
Pins 6/7 for +12V




Voltage Suspect Power
NO
Correct? Interface Board



YES


Suspect Digital
Board
Video OK Start
No Audio

With the set
Powered On,
check BA001
Pin 1 for +12V




Voltage Suspect Main
NO
present? SMPS Board



YES


Check BA002
Pins 1 and 3 for
audio signal




Signal Suspect Digital
NO
present? Board




YES




Check BA002
Pins 5 for 0V
Pin 6 for-0.2V




Check the Sound
Voltages Suspect Digital Menu. Make sure
NO
present? Board Internal Speakers
is checked.



YES



Check for Signal
on BA003 and
BA004




Signal Suspect Audio Amp
Suspect Speakers YES NO
present? Board
Sound OK Start
No Video

With the set
Powered On,
check 1M03
Pin 1 for +8.5V
Pin 3 for +5V




All voltages Suspect Digital
NO
present? Board



YES


Check CON 3
Pins 5/6 for +24V




Voltages Suspect Main
NO
present? SMPS Board




YES




Check signals
on 1G50




Signals Suspect Digital
NO
present? Board




YES




Suspect LCD
Panel