Sharp XV-DW100U, Service Manual

Page: 35 / 125

35
XV-DW100U
TROUBLE SHOOTING TABLE
(Continued)
Checking the video unit circuit
Yes
No
Check the IC401 selector switch,
terminal voltage and input circuit.
Yes
No
Is there video signal input at IC4001?
Check the low-pass and buffer
circuits of Q4002 thru Q4012.
Yes
No
Are there signal outputs at pins (6)
and (8) of IC4001?
Check IC4001 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 IC401?
Check Q4007 thru Q4009 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?
Check the power circuit and its parts.
Yes
No
Are there signal inputs at pins (7), (9)
and (25) of SC401?
Are there signals at pin (4) of IC6011?
Are there signal outputs at pins (7) of
IC6010 and (5) of IC6009? Yes
Check the video unit circuit
(IC4501 and IC4001 and its
peripheral circuits).
No
Check the oscillation circuit
of IC6011, and their
peripheral circuits.
Yes
Go to "Checking IC801
(RGB signal output circuit)".
No
Check IC6001, IC6010,
IC6009 and their peripheral
circuits as well as switching
circuit.
Is the lamp on?