• LG 42LX6500 no audio

It is currently 12 May 2025, 04:48

LG 42LX6500 no audio

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
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#1 LG 42LX6500 no audio

by Zemog • 26 April 2025, 13:43
Hello!
I wonder if anyone can enlighten me. This TV was working fine until it went "plof!" while watching, and since then, the audio hasn't been heard.

The MAIN board is EAX62116804, and the audio controller is an NTP-7100.
Visually, I can't detect any damaged components.
I've taken the following measurements on the NTP-7100:
Pin 3 ... 3.3V
Pin 8 ... +3+3v_MULTI
Pin 12 ... 1.8V
Pin 16 ... 1.8V
Pin 22 ... 0V
Pin 32, 33, 34, 35 ... 21.6V
Pin 49, 50, 51, 51 ... 21.7V

On the speaker connector, I have 1.2V on all 4 pins.

I've measured the speakers, and they're fine. Still, other speakers have been tried, and they don't work either.

I have downloaded and updated the latest software and firmware from the official LG website, and it has not solved the problem either.

Any suggestions?

Re: LG 42LX6500 no audio

by Google Adsense [BOT] • 26 April 2025, 13:43

#2 Re: LG 42LX6500 no audio

by matic • 26 April 2025, 16:32
Hello!

Measure the voltages to ground on pins 1, 2, 7, 13, 17, 20, 21, 25, 26, 27, 40, 41, 43, 44 of chip NTP-7100 during audio playback.

#3 Re: LG 42LX6500 no audio

by Zemog • 28 April 2025, 10:45
Pin 1... 12,5V
Pin 2 ... 5,1V
Pin 7 ... 2V
Pin 13 ... 1,7V
Pin 17 ... 1,6V
Pin 20 ... 2V
Pin 21 ... 3,2V
Pin 25 ... 3,3V
Pin 26 ... 13,1V
Pin 27 ... 12,4V
Pi 40 ... 12,3V
Pin 41 ... 5,1V
Pin 43 ... 13,2V
Pin 44 ... 12,5V

#4 Re: LG 42LX6500 no audio

by matic • 28 April 2025, 12:53
Zemog wrote:Pin 41 ... 5,1V
Is this measurement correct?

#5 Re: LG 42LX6500 no audio

by Zemog • 29 April 2025, 10:40
matic wrote:¿Es correcta esta medida?

I checked pin 41 again and the value is as indicated... 5.1V

#6 Re: LG 42LX6500 no audio

by matic • 29 April 2025, 12:32
Replace the chip NTP-7100.

Re: LG 42LX6500 no audio

by Google Adsense [BOT] • 29 April 2025, 12:32
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