Sharp XV-DW100U, Service Manual

Page: 37 / 125

37
XV-DW100U
TROUBLE SHOOTING TABLE
(Continued)
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
Yes
No
Check the buffer circuit of Q6004 thru
Q6006 as well as Q6001 thru Q6003.
Yes
No
Are there signal outputs at pins (55)
(Y signal) and (51)(chroma signal) of
IC8001?
Check IC8003, IC8002 (memory) and
their peripheral circuits.
Yes
No
Are there signal outputs at the
emitters of Q6008 (Y signal) and
Q6009 (chroma signal)?
Check the low-pass circuit around
Q6008, Q6007 and Q6009.
Check IC6009, IC6010 and IC801
(RGB signal output circuit).
Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of
IC8001?
No color or unusual tone (NTSC, PAL)
Yes
No
Go back to the signal processing
block.
Yes
No
Check the oscillation of X801 and
X802, and their peripheral circuits.
Check IC803, IC814 and their
peripheral circuits.
Are there signal outputs at pins
(46)(R-Y) and (45)(B-Y) of IC801?
Is there chroma signal input at pin
(20) of IC801?