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Low Sound Level on a old Quasar YTS2623EK

Hello,

TV Model: Quasar YTS2623EK

Problem: Low Sound Level (half of normal)

Description: TV enter the shop with a blow out resistor and diode related to the supply of the Audio Amp. We replace the parts and it was working, but the customer complain the sound is too low now.

We check all parts related to audio, even replace the IC, same result.

We finally found that the volume is DC controlled via a AN15150114A. If we push the DC manually the sound level is quite loud, but the controller chips do not goes more than half level.

Sound raise from 0 to 30 on the on screen display, and stay equal from 30 to

  1. We observe that the DC raise from 0 to 3 volts on the DC control pin of the amplifier, while the on screen display raise from 0 to 30, but the DC stay stable to 3Vdc from 30 to 60.

So do anyone know why the AN15150114A is unable to push higher than 3 Vdc? Its a sort of PWM control going out of the chips, we can not find any speck for that chips. We have no way to find one to check if the chip is OK. This is an old unit.

Everything else is OK.

Bye Jacques

--
Jacques St-Pierre
Président Directeur Général / Chief Executive Officer
MULTI-ÉLECTRONIQUE (MTE) INC.
www.multi-electronique.com
Tél. : (418) 724-5835
Reply to
Jacques St-Pierre
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I would check the DC level output with a scope. Is it choppy or filtered? Also, check if there is some capacitor in the circuit that has failed. The capacitor could be breaking down and limiting the voltage to the audio amplifier. Another good test would be to float the pin in question and see if the voltage increases without a load on it.

Good luck.

--
David Farber
David Farber's Service Center
L.A., CA
Reply to
David Farber

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