LC-70UD1U
6 – 21
No video signal from terrestrial digital, BS digital or HDMI input (1) (DRC PWB: G305)
Is 13.2 V applied to TL8222?
NO
Check the power supply cable and the power PWB.
YES
Go to the section "No video signal from terrestrial digital, BS digital or
HDMI input (2) (DRC PWB: G305)."
No video signal from terrestrial digital, BS digital or HDMI input (2) (DRC PWB: G305)
Is the pin (MAIN_226_LOCKN) of Q4909 in "L"?
(Check the LOCK signal of MAIN I/F Vx1.)
NO
Is 1.8 V applied to pins 11,
85, 86 and 100 of IC4901?
NO
Check the operation of
1.8 V regulator (IC6001).
YES
YES
Check the operation of
IC4901 or the main PWB.
Is pin 2 (215_226_LOCKN1) of R7102 in "L"?
NO
Go to the section "LSE1
sync signal check."
YES
Is pin 2 (215_226_LOCKN2) of R7302 in "L"?
NO
Go to the section "LSE2
sync signal check."
YES
Is pin 2 of FB8526 in "L"?
(Check the LOCK signal of T-Con I/F Vx1.)
NO
Go to the section "FRC
operation check."
YES
Does the video appear?
NO
Go to the section "T-Con
PWB operation check ."
YES
Complete.
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