Yes
No
Is the
BT30V
source
OK?
Check for the BT30V, DTV_9V, and
SUB_5V on connector AP3
of the AP board. Refer to Slide 45 for test
point locations.
Check the cathode of D7601
on the AP Board. Cathode of D7601
should measure 30V. If not, repair the DTV9V
DC/DC converter.
Yes
Are DTV 9V
And SUB
5V OK?
Replace defective Regulator and
biasing components. Reference
the power distribution diagram on
Slide 21.
No
Yes
Is there video from
any of the inputs?
Replace the A board
No
Replace the DT board
Yes
See the
troubleshooting
flowchart for No
picture.
No
Are SUB_3.3V
and SUB_1.2V present
on the A board? Refer to
Slide 46 for test
point locations.
No Picture from TV Reception
53
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