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5 Troubleshooting
5-1 No Power

Does proper DC 14V/5V appear at No
1 Check FT101 and FT103.
DC jack connected to CN120?



Yes


Does proper DC 5V No
4 Check IC103 and IC102.
appear at Pin 2 of IC102?



Yes


Does proper DC 2.5V No
2 Check IC106.
appear at Pin 2 of IC106?



Yes



Does proper DC 14V No
3 Check IC108.
appear at Pin 5 of IC108?



Yes


Does proper DC 5V No
1 Check IC108.
appear at FT107?



Yes


Check IC401.




LW20M11C 5-1
5 Troubleshooting

WAVEFORMS

1 2 3




4




5-2 LW20M11C
5 Troubleshooting

5-2 No Picture (TV, Video, S-Video, DVD)

Check C452 (TV)
Check C453 (Video) No
5 Check the input signal.
Check C454 (S-Video)
Check C456 (DVD)?


Yes


Check the IC401.




WAVEFORMS

5




LW20M11C 5-3
5 Troubleshooting

5-3 No Sound

Does the signal appear at
Pin 67 (Tuner sound signal) and No (RF) Check the Pin 8 of CN701.
Pin 53, 54 (Video sound) and (Video Sound) Check the CN903.
Pin 56, 57 (DVD Sound) (DVD Sound) Check the CN905.
of IC501 (MSP3425)?


Yes


Does the signal appear at Pin 27, No Check the Pin 3 of IC501 and
28 of IC501 (MSP3425)? related circuit of IC501.


Yes



Does the signal appear No Check the IC651 (Audio amp)
at Pin16, 19, 2 and 5 of CN651? and related circuit of IC651.



Yes


Replace the speaker.




5-4 LW20M11C