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
- 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