Sharp XG-NV5XB Service Manual page 34

XG-NV5XB
TROUBLE SHOOTING TABLE
Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of
IC806?
Are there signal outputs at pins (55)
(Y signal) and (51)(chroma signal) of
IC806?
Are there signal outputs at the
emitters of Q817 (Y signal) and Q910
(chroma signal)?
Check IC816 and IC801 (RGB signal
output circuit).
No color or unusual tone (NTSC, PAL)
Are there signal outputs at pins
(46)(R-Y) and (45)(B-Y) of IC801?
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
Yes
Yes
Yes
Is there chroma signal input at pin
(20) of IC801?
Yes
Yes
Check IC803, IC814 and their
peripheral circuits.
(Continued)
No
Check the buffer circuit of Q814 thru
Q816 as well as Q903 thru Q906.
No
Check IC806, IC807 (memory) and
their peripheral circuits.
No
Check the low-pass circuit around
Q817, Q907 and Q910.
No
Go back to the signal processing
block.
No
Check the oscillation of X801 and
X802, and their peripheral circuits.
34