Sharp XG-V10WU Service Manual page 43

TROUBLE SHOOTING TABLE
Checking the chroma and Y signals of IC801
(RGB signal output)
Are there signal inputs at pins (12),
(31) and (37) of SC401?
Yes
Are there output waveforms at pins
(7) of IC6014 (chroma signal) and
(7), (Y signal)of IC6015?
Yes
Are there signal inputs at pins (20)
(chroma signal) and (21) (Y signal)
of IC803?
Yes
Go to "Checking IC801 (RGB signal
output circuit)".
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of
IC6009?
Yes
Are there signal outputs at pins (55)
(Y signal) and (51)(chroma signal) of
IC8001?
Yes
Are there signal outputs at the
emitters of Q6010 (Y signal) and
Q6015 (chroma signal)?
Yes
Check IC6011, IC6014, IC6015 and
IC801 (RGB signal output circuit).
No colour or unusual tone (NTSC, PAL, PALM, PALN)
Is there chroma signal input at pin
(20) of IC801?
Yes
Are there signal outputs at pins
(46)(R-Y) and (45)(B-Y) of IC801?
Yes
Check IC804, IC805 and their
peripheral circuits.
No
Go to "Checking the video unit
circuit".
No
Check the IC6009 IC6010 and IC6011
switching and their peripheral circuits.
If there is no signal at pins (1) of
IC6014 and pin (5) of IC6015 and pin
(16) of IC6010 check 3-D noise
reduction circuit (IC6009).
No
Check IC803 and its peripheral
circuits.
No
Check the buffer circuit of Q6007 thru
Q6011 as well as Q6013 thru Q6014.
No
Check IC6008, IC6010 (memory) and
their peripheral circuits.
No
Check the low-pass circuit around
Q6010, Q6012 and Q6015.
No
Go back to the signal processing
block.
No
Check the oscillation of X801, X802,
X803 and X804 and their peripheral
circuits.
43
(Continued)
Check IC6009 (3-D noise reduction
circuit) and its peripheral circuits.
XG-V10WU
AN-SD1U/S422U