Insignia NS-LCD32, Service Manual

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(4) with sound but no picture
(5) S-Video or AV no picture
With sound but no picture
Display OSD MENU?
Display LOGO?
Yes
Yes No
If there is no picture
in all channels?
Check if the crystal in data processing board starts,
DDR clock and DDR SDRAM are normal?
Yes
No
Check N100 and
its peripheral circuit
Refer to (6), (7), (8), (9), (10),
(11), (12) checking procedure
Check if CB106 and CB49 input signals? (AV IN)
Check if LB7, LB8 input signals? (S-Video)
Yes
No
Yes
No
Check if pin20 of NB8
outputs signals?
Check N105/N106 and the circuit
from AV terminal to N104
Check N100, CB153 and
their periphery circuit
Check NB8 and its
periphery circuit
Check the power supply of N100
on the image processing board
Check the power supply of N100 (on digital
processing board) and DDR and their periphery.
Yes
No