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LC-90Y8T
Does not the signal input to Network go out?
Does the signal in/output to pins(1),(2),(3),(6) of LAN-jack
(J9401)?
YES
Do signals in/output to pins of IC3301 (Digital AV decode & Main
CPU)?
Pins [AU18&AT18/CPU_DATMDI_RJ45_TNP, AU17&AT17/
CPU_DATMDI_RJ45_RNP]
YES
Check IC3301 and its peripheral circuits.
Is the AC cord connector tightly connected to the set?
YES
Are the wire harnesses and other cables properly connected to
the set?
YES
Is power supplied from pins [15/BU+5V] of [PD]P3801 ?
YES
Is there the pins [14/PS_ON] of [PD]P3801 at H ?
YES
Is there the pins [13/AC_DET] of [PD]P3801 at "H"?
YES
Is power supplied from pins [5 8/UR+13V] of [PD]P3801 as
specified?
YES
Are the DC/DC converter outputs and the output voltages along
1) BU+3.3V
(IC9605 etc.)
2) U + 5V
(IC9607 etc.)
3) D+5V
(IC9607 etc.)
4) D+3.3V
(IC9606 etc.)
5) M+0.3V
(IC9601 etc.)
6) D+1.5V
(IC9604 etc.)
7) D+1.2V
(IC9603 etc.)
8) IF+1.8V
(IC1109 etc.)
9) STB+3.3V
(IC9602 etc.)
10) AVDD12_HDMISW
11) CPU_ADAC+3.3V
(IC3302 etc...)
(IC3105 etc...)
(IC1903 etc...)
[External input Network] No picture on the display
No power ( No LED light up ) or No startup ( LED RED Blinking )
(IC2602)
(IC3303 etc.)
NO
Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
NO
Check the line between IC3301 and J9401.
(T9401 etc)
NO
Reconnect the AC cord tightly and turn on the power again.
NO
Reconnect the wire harnesses and other cables properly to the set.
NO
Replace the power unit.
NO
Check the signal line between PS_ON and IC2004(UCOM)/
IC3301(Digital AV decode & Main CPU) .
NO
Check the power unit ,
and the signal line between AC_DET and IC2004/IC3301.
NO
Check the line between PS_ON and IC2004/IC3301 .
NO
Check the DC/DC converters and the control lines.
Replace defective parts as required.
6 – 14
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