Sharp XG-NV2SB, Service Manual

Page: 32 / 148

32
XG-NV2SB
TROUBLE SHOOTING TABLE
(Continued)
Checking the video unit circuit
Yes
No
Check the IC6001 selector switch,
terminal voltage and input circuit.
Yes
No
Is there video signal input at pin (15)
of IC6004?
Check the low-pass and buffer
circuits of Q6009 thru Q6014.
Yes
No
Are there signal outputs at pins (6)
and (8) of IC6004?
Check IC6004 and its peripheral
circuits (bias).
Yes
No
Check the low-pass and buffer circuits
of Q6002 thru Q6008. Is the signal as
specified?
Go to "Checking IC801 (RGB signal
output circuit)".
Is there video signal output at pin (7)
of IC6001?
Check Q6002 thru Q6008 and their
peripheral circuits.
Checking the video system
Yes
No
Go to "Lamp fails to light-up".
Yes
No
Is specified voltage fed to EA
connectors? Also, is the voltage signal
P1501 and P1502 right?
Check the power circuit and its parts.
Yes
No
Are there signal inputs at pins (40)
and (45) of IC806?
Are there signals at pin (4) of IC401
and pin (4) of IC402?
Are there signal outputs at pins (3)
and (6) of IC816?
Yes
Check the video unit circuit
(IC6004 and its peripheral
circuits).
No
Check the oscillation circuit
of IC401 and IC402, and
their peripheral circuits.
Yes
Go to "Checking IC801
(RGB signal output circuit)".
No
Check IC816, IC806 and
their peripheral circuits as
well as switching circuit.
Is the lamp on?