LG LST-3100A Service Manual page 32

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(B)

Check whether analog mute ON?

Check analog buffers. IC303 for 480i, IC302

for component YPbPr or RGB analog

Jump to (A) flow

(C)

Check input stream existence.

Any problem?

Any problem in selecting ATSC?

Any decoding problem?

End

YES

No OSD is not a problem.

Check DVI output.

YES

Check whether +A12V is supplied.

YES

check VSB(IC203 ) block. FIG. 05

YES

Check voltage of IC203(23) => 3.3V

YES

Check signal strength. If OK, check

system clock 27MHz. IC300(9)

Check HD 2 chip Interrupt FIG. 06

3-24

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