Read Sharp XG-XV2E (serv.man2) Service Manual online
41
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
and its peripheral circuits
Yes
No
Check the buffer circuit of Q814 thru
Q816 as well as Q903 thru Q905.
Q816 as well as Q903 thru Q905.
Yes
No
Are there signal outputs at pins (55)(Y
signal) and (51)(chroma signal) of
IC806?
signal) and (51)(chroma signal) of
IC806?
Check IC806, IC807 (memory) and
their peripheral circuits.
their peripheral circuits.
Yes
No
Are there signal outputs at the
emitters of Q817 (Y signal) and Q910
(chroma signal)?
emitters of Q817 (Y signal) and Q910
(chroma signal)?
Check the low-pass circuit around
Q817, Q907 and Q910.
Q817, Q907 and Q910.
Check IC816 and IC801 (RGB signal
output circuit).
output circuit).
Are there signal inputs at pins (40)(Y
signal) and (45)(chroma signal) of
IC806?
signal) and (45)(chroma signal) of
IC806?
Checking the chroma and Y signals of IC801
(RGB signal output)
(RGB signal output)
Yes
No
Go to "Checking the video unit
circuit".
circuit".
Yes
No
Check the IC816 switching and their
peripheral circuits. If there is no
signal at pins (8) and (16), check the
3-D noise reduction circuit (IC806).
peripheral circuits. If there is no
signal at pins (8) and (16), check the
3-D noise reduction circuit (IC806).
No
Are there signal inputs at pins
(20)(chroma signal) and (21)(Y signal)
of IC801?
(20)(chroma signal) and (21)(Y signal)
of IC801?
Check IC801 and its peripheral
circuits.
circuits.
Check IC806 (3-D noise reduction
circuit) and its peripheral circuits.
circuit) and its peripheral circuits.
Go to "Checking IC801 (RGB signal
output circuit)".
output circuit)".
Yes
Are there signal inputs at pins (12)(Y
signal) and (19)(chroma signal) of
P402?
signal) and (19)(chroma signal) of
P402?
Are there output waveforms at pins
(3)(chroma signal) and (6)(Y signal)
of IC816?
(3)(chroma signal) and (6)(Y signal)
of IC816?
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