Sharp XG-XV2E (serv.man2) Service Manual ▷ View online
37
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Yes
Yes
No
No
Is there signal at pin (3) of IC8004?
Is there signal at pin (3) of IC8004?
LCP circuitry faulty.
Yes
Yes
No
No
Is there signal at pin (3) of IC8006?
Is there signal at pin (3) of IC8006?
IC8004 or its peripheral circuit faulty.
Yes
Yes
Yes
No
No
Is there signal at pin (6) of IC8009?
Is there signal at pin (6) of IC8009?
IC8006 or its peripheral circuit faulty.
Yes
No
No
Are there signals at BI1A0 thru -7 and
BI1B0 thru -7 of IC8025?
BI1B0 thru -7 of IC8025?
Are there signals at VAB0 thru -7 of
IC8020?
IC8020?
IC8009 or its peripheral circuit faulty.
Yes
No
Are there signals at BI2A0 thru -7 and
BI2B0 thru -7 of IC8025?
BI2B0 thru -7 of IC8025?
IC8020 or its peripheral circuit faulty.
Yes
No
Are there signals at R1 thru -10 and
G1 thru -10 of IC8032?
G1 thru -10 of IC8032?
IC8025 or its peripheral circuit faulty.
Yes
No
Are there signals at the bases of Q23
and Q25?
and Q25?
IC8032 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (1) and (3) of
TC2?
TC2?
Q13, Q22 thru Q25 or their peripheral
parts faulty.
parts faulty.
TC2 connector or output PWB faulty.
Checking the XGA's
blue video circuit
and its peripheral
circuits
blue video circuit
and its peripheral
circuits
Checking the VGA's
blue video circuit
and its peripheral
circuits
blue video circuit
and its peripheral
circuits
Yes
No
Are there signals at VBB0 thru -7 of
IC8020?
IC8020?
R8279, R8280 or LCP circuitry faulty.
Check the video
system's blue video
circuit and its
peripheral circuits.
system's blue video
circuit and its
peripheral circuits.
D
D
38
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Checking the OSD circuit and its peripheral circuits
Yes
No
Are there signals at pins (7), (8), (37)
and (38) of TC2 connector?
and (38) of TC2 connector?
LCP circuitry faulty.
Yes
No
Are there signals at pins (1) and (2) of
IC8037?
IC8037?
IC8025 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (71), (74)
thru (79) of IC8025?
thru (79) of IC8025?
IC8037 or its peripheral circuit faulty.
IC8036 or its peripheral circuit faulty.
Checking the remote control
Yes
No
Run the remote control. Are there
signals at pins (9) and (39) of TC2
connector?
signals at pins (9) and (39) of TC2
connector?
LCD circuitry faulty.
IC8001 or its peripheral circuit faulty.
39
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Checking the video unit circuit
Yes
No
Check the IC6001 selector switch,
terminal voltage and input circuit.
terminal voltage and input circuit.
Yes
No
Is there video signal input at IC6004?
Check the low-pass and buffer
circuits of Q6009 thru Q6014.
circuits of Q6009 thru Q6014.
Yes
No
Are there signal outputs at pins (6)
and (8) of IC6004?
and (8) of IC6004?
Check IC6004 and its peripheral
circuits (bias).
circuits (bias).
Yes
No
Check the low-pass and buffer circuits
of Q6002 thru Q6008. Is the signal as
specified?
of Q6002 thru Q6008. Is the signal as
specified?
Go to "Checking IC801 (RGB signal
output circuit)".
output circuit)".
Is there video signal output at pin (7)
of IC6001?
of IC6001?
Go to "Checking the IC401 and
IC402 oscillation circuit and its
peripheral circuit".
IC402 oscillation circuit and its
peripheral circuit".
Checking the video system
Yes
No
Go to "Checking lamp light-up".
Yes
No
Is specified voltage fed to EA and EB
connectors?
connectors?
Check the power circuit and its parts.
Yes
No
Are there signal inputs at pins (40)
and (45) of IC806?
and (45) of IC806?
Are X401 and X402 oscillating?
Are there signal outputs at pins (1)
and (9) of IC816?
and (9) of IC816?
Yes
Check the video unit circuit
(IC6004 and its peripheral
circuits).
(IC6004 and its peripheral
circuits).
No
Check the oscillation circuit
of IC401 and IC402, and
their peripheral circuits.
of IC401 and IC402, and
their peripheral circuits.
Yes
Go to "Checking IC801
(RGB signal output circuit)".
(RGB signal output circuit)".
No
Check IC816, IC806 and
their peripheral circuits as
well as switching circuit.
their peripheral circuits as
well as switching circuit.
Is the lamp on?
40
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Checking the oscillation circuit
Yes
No
Check the +5V line, and IC408, IC801
and their peripheral circuits.
and their peripheral circuits.
Yes
No
Are there oscillation waveform inputs
at pin (4) of IC401 and IC402?
at pin (4) of IC401 and IC402?
Check the oscillation of X401 and
X402.
X402.
No
No
Is there oscillation waveform output
at pin (1) of IC403? 14.31818 MHz
for NTSC, and 17.73447 MHz for
PAL and SECAM?
at pin (1) of IC403? 14.31818 MHz
for NTSC, and 17.73447 MHz for
PAL and SECAM?
Check the level of 5-pin switch of
IC403 and its peripheral parts.
IC403 and its peripheral parts.
Check the buffer circuit of Q428 thru
Q430, and its peripheral circuits.
Q430, and its peripheral circuits.
Yes
Are voltages at IC401 and IC402 as
specified? Are there signal inputs at
pins (6) and (7)?
specified? Are there signal inputs at
pins (6) and (7)?
Checking IC801 (RGB signal output circuit)
Yes
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC801.
performance at pins (17) and (18) of
video IC801.
No
Go to "No color or unusual tone", 'No
Y signal" or "Out of sync".
Y signal" or "Out of sync".
Yes
No
Are there output waveforms at the
emitters of Q1501, Q1502 and
Q1503?
emitters of Q1501, Q1502 and
Q1503?
Check Q801 thru Q803 (buffer),
IC1501 (amplifier), IC1502 (RGB
offset) and their peripheral circuits.
IC1501 (amplifier), IC1502 (RGB
offset) and their peripheral circuits.
No
Are A/D outputs of IC1504, IC1505
and IC1506 as specified?
and IC1506 as specified?
Check the VCLK, IC1504, IC1505,
IC1506 and their peripheral circuits.
IC1506 and their peripheral circuits.
Go to "Checking the PC circuit unit".
Yes
Are there RGB output waveforms at
pins (31), (32) and (33) of IC801?
pins (31), (32) and (33) of IC801?
Is there oscillation waveform output at
TP401?
TP401?
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