Sound Signal Circuit between Video Terminal and Television Display: Procedure

1. Disconnect the U2 television display assembly connector.
   Fig 1: Checking Television Display Assembly With U2 Connector End View

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2. Using an oscilloscope, check the signal waveform between 3 (VAR+) or 4 (VAL+) and 11 (VA-) according to the conditions, as shown in the chart below.

   Signal Waveform

   Tester Connection	Condition	Specified Condition
   U2-3 (VAR+) - U2-11 (VA-)	Audio sound is being produced	A waveform synchronized with sound is output
   U2-4 (VAL+) - U2-11 (VA-)

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Television Display Assembly)

NG → See step   2 

OK → See step   3 

1. Disconnect the P3 video terminal connector.
2. Disconnect the U2 television display assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P3-1 (VAR+) - U2-3 (VAR+)	Always	Below 1 Ω
   P3-2 (VAL+) - U2-4 (VAL+)	Always	Below 1 Ω
   P3-3 (VA-) - U2-11 (VA-)	Always	Below 1 Ω
   P3-7 (SG) - U2-1 (AGND)	Always	Below 1 Ω
   P3-1 (VAR+) - Body ground	Always	10 kΩ or higher
   P3-2 (VAL+) - Body ground	Always	10 kΩ or higher
   P3-3 (VA-) - Body ground	Always	10 kΩ or higher
   P3-7 (SG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4