Sharp Notevision XG-NV7XU, Service Manual

Page: 34 / 110

34
XG-NV7XU
TROUBLE SHOOTING TABLE
(Continued)
Checking IC801 (RGB signal output circuit)
Yes
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC801.
No
Go to "No color or unusual tone",
"No Y signal" or "Out of sync".
Yes
No Are there output waveforms at pin
(1) of IC6803, IC6804, IC6805?
Check IC6802, IC6803, IC6804,
IC6805 and their peripheral circuits.
No
Are A/D outputs of IC6805, IC6806
and IC6807 as specified?
Check the CLK IC6805, IC6806,
IC6807 and their peripheral circuits.
Yes
Are there RGB output waveforms at
pins (31), (32) and (33) of IC801?
Checking the chroma and Y signals of IC801
(RGB signal output)
Yes
No
Go to "Checking the video unit
circuit".
Yes
No
Check the IC6009 and IC6010
switching and their peripheral circuits. If
there is no signal at pins (1) of IC6010
and pin (16) of IC6009 check 3-D noise
reduction circuit (IC8001).
No
Are there signal inputs at pins (20)
(chroma signal) and (21) (Y signal)
of IC801?
Check IC801 and its peripheral
circuits.
Check IC806 (3-D noise reduction
circuit) and its peripheral circuits.
Go to "Checking IC801 (RGB signal
output circuit)".
Yes
Are there signal inputs at pins (7), (9)
and (25) of SC401?
Are there output waveforms at pins
(7) of IC6010 (chroma signal) and
(5), (Y signal)of IC6009?
Go to "Trouble shooting table for PC
I/F unit".