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Old 07-24-2018, 02:56 PM   #1
disorder
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Default LG 42lv5300 no audio, image ok

hello,

i need some help.
i have to check a tv lg 42lv5300 : no sound and picture ok
all audio outpout not work : speakers, headphone or optical outpout.
i checked the voltage on speakers : 10V on the four : spkL+, spkL-, spkR+ and spkR-

i have resolder the audio amp ic : ntp-7100, the same. i don't think it's faulty cause optical outpout not work too

i have tried all hdmi inpout, the same

can someone help me ?

thank you
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Old 07-24-2018, 09:02 PM   #2
R_J
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Default Re: LG 42lv5300 no audio, image ok

All audio signals seem to come from ic100 LGE3556C, Audio amp ic operates from +24 volts which would explain 10 volts on all speaker pins (aprox half of supply voltage)
Also headphones use a seperate amp.
It could be anything including eeprom corruption or some wrong setting in the service menu

Last edited by R_J; 07-24-2018 at 09:08 PM..
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Old 07-25-2018, 03:37 PM   #3
disorder
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Default Re: LG 42lv5300 no audio, image ok

hi,

i have just reflowed the lge3556c and it works now !!!

thank you boss !
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Old 07-25-2018, 05:26 PM   #4
Andrew F. Ali
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Default Re: LG 42lv5300 no audio, image ok

Glad you got audio. Thanks for the update.
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Old 05-28-2019, 04:41 AM   #5
diif
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Default Re: LG 42lv5300 no audio, image ok

I've just had a 47LD790 in with picture but no sound. Also cured with a reflow.
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