Check TU500 Pin15(Video output),
Pin16(Sound output)
Can you see the normal signal?
YES
Check the output of TR(Q503).
Can you see the normal waveform?
YES
Check the output of Main IC(IC100). Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
This board has big problem because Main IC(IC100) have some troubles.
After checking thoroughly all path once again, You should decide to replace Main Board or not.
NO
NO
NO
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| Could you measure voltage of |
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| TU800 & IIC lines? |
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| Are they all normal? |
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| YES |
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| You should replace TUNER. |
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| After checking the Power of Main |
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| IC(IC100) you should decide to replace |
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| Main IC or not. |
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Copyright © 2007 LG Electronics. Inc. All right reserved. | - 22 - | LGE Internal Use Only |
Only for training and service purposes |
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