LG CM9540 — руководство по ремонту: проблемы с загрузкой через CD/USB [31/85]

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3-10

ONE POINT REPAIR GUIDE

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order

(HELLO --> VOL XX --> CD or USB) on VFD,

it will not display other message on VFD, and it will not boot-up normally.

4-5. DSP IC (IC501)

4-5-1. Solution

Please check and replace IC501(MLC3730) on MAIN board.

4-5-2. How to troubleshoot (Countermeasure)

1) After check them by previous pages about no booting, if the set is still no booting,

 Check soldering status of IC501.

2) If below bootstrap waveform doesn’t come out, then replace IC501(DSP IC).

4-5-3. Service hint (Any picture / Remark)

R594

PGPB12

(Y ellow)

R598

PAD19

(Green)

R597

PAD20

(Pink)

y\`[

y\`_

y\`^GOiP

IC501

R546

< Signal check point >

< Signal waveform >