Service manual

LC-52/60/70LE640U,C6400U (1st Edition)

6 – 8

No video (2)

COMPONENT: No external input video [INPUT-5]

Is INPUT-5 selected on the input select menu screen?

Is the INPUT-SELECT for the input signal?

YES

Select INPUT-5 on the input select menu screen for the

right input signal.

Does the COMP1_PLUG detection function?

Check the line between pin (17) of input terminal (J510)

and pin (L32) of IC3303 (CPU).

Is the T-CON PWB connected?

VBO_HTPDN (40pin), VBO_LOCKN (39pin) of P2604 become Low if there is no prob-

lem in the connection.

NO Check the panel module and harness.

YES

Are the V-By-One signal input to the pin of P2604?

VBO_CN_TXA+/- (36/37pin), VBO_CN_TXB+/- (32/33pin),

VBO_CN_TXC+/- (28/29pin), VBO_CN_TXD+/- (24/25pin).

NO Check IC3303 and its peripheral circuits.

(IC3501/IC3502/IC3503, etc.)

YES

Check the panel module and harness.