Sharp XG-NV5XB Service Manual page 33

TROUBLE SHOOTING TABLE
Checking IC801 (RGB signal output circuit)
Go to "No color or unusual tone", "No
Y signal" or "Out of sync".
Checking the chroma and Y signals of IC801
(RGB signal output)
Are there signal inputs at pins (12)
(Y signal) and (19)(chroma signal) of
P402?
Yes
Are there output waveforms at pins
(3)(chroma signal) and (6)
(Y signal)of IC816?
Yes
Are there signal inputs at pins (20)
(chroma signal) and (21) (Y signal)
of IC801?
Yes
Go to "Checking IC801 (RGB
signal output circuit)".
No
Are there RGB output waveforms at
pins (31), (32) and (33) of IC801?
Yes
Are there output waveforms at the
emitters of Q1501, Q1502 and
Q1503?
Yes
Are A/D outputs of IC1504, IC1505
and IC1506 as specified?
Yes
Go to "Trouble shooting table for PC
I/F unit".
No
Go to "Checking the video unit
circuit".
No
Check the IC816 switching and their
peripheral circuits. If there is no signal
at pins (9) and (1) of IC816, check 3-D
noise reduction circuit (IC806).
No
Check IC801 and its peripheral
circuits.
33
(Continued)
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC801.
No
Check IC1501 (amplifier),
(RGB offset) and their peripheral
circuits.
No
Check the VCLK, IC1504, IC1505,
IC1506 and their peripheral circuits.
Check IC806 (3-D noise reduction
circuit) and its peripheral circuits.
XG-NV5XB
IC1502