Specifications

45
LC-20D30U
TROUBLE SHOOTING TABLE (Continued)
Check IC3301(Audio
AMP.), IC1301(Sound
Decoder), IC801(Video
Decoder), IC8701(AD
Converter) and their
peripheral parts.
Check the output circuit
of IC701, IC702, IC704
and IC706.
Are the secondary
outputs of DCDC
converter, IC701, IC702,
IC704 and IC706?
Is there DC 12V output at
T7701 ?
Is the output voltage of
IC2003, IC2011, IC802,
IC8702, IC8703 and
IC7004 as specified?
Check the load of IC2003,
IC2011, IC802 IC8702,
IC8703 and IC7004.
Check T7701, IC7705
and their peripheral
circuits.
Check the T7701,IC7705
and their peripheral
circuits.
Disconnect F7701. Is
the load short-circuited?
Check the INV_VCC
line, or check or replace
the fluorescent lamp.
No video and audio output (no power) No fluorescent lamp light-up
No No
No
No
No
No
Are F7701 as specified?
Replace F7701.
Is the pin (187) of IC801
"H" or a pulse?
or, are the pins (2) and
(70) of IC2001 "H" state?
Check its line, IC801,
IC2001 and their
peripheral parts.
Yes
Yes
Yes
Yes
Yes
Yes
Check the microprocessor's adjustment process menu for wrong settings.