No Sound In Sony Hi-Fi Solved
This Sony Hi-Fi System came in with the complaint of no sound but other features seems to be working fine. I took out my old speaker and connected it to the output jack and there was still no sound. This means this no sound problem was not due to bad speakers.
All the setting were good and even the volume already tuned to maximum and the sound refused to come.
I opened the cover and head straight to the main board and made sure the dc voltages are present. In deed there were good DC voltages in the mainboard. I can check the audio IC dc supply voltage first but this article is to let you know about the procedure of troubleshooting.
Next, I checked the DC supply voltage to the audio sound IC. Again the DC voltage were present.
In fact for this model I had replaced some audio ICs already and it worked fine.
I took my rework station and heat up the IC and removed it.
I have some spare good ICs with me and I replaced it
After soldering the IC, I cleaned the audio IC with cleaning solution and powered up the unit. The sound came back as expected.
Conclusion. Assuming if after replaced the IC and still no sound then I have to check the incoming and outgoing signal waveform already.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Parasuraman S
July 15, 2020 at 9:37 pm
Good work!
robert
August 6, 2022 at 4:19 am
Sorry but i dont agree on this as it is too early to conclude that sound output is not coming due to audio IC failure whereas there are many other preliminary check one can do viz. resistor n relay which switched on circuit to speakers
Albert van Bemmelen
July 16, 2020 at 12:26 am
Good job of course! But seeing you have so many of those amplifier chips in stock something tells me that they fail many times. Which likely is no good advert for the manufacturer of those Audio sets?
Boyd nyirenda
July 16, 2020 at 3:56 am
What could be the problem with the subwoofer with no display?
Yogesh Panchal
July 17, 2020 at 4:32 pm
Good Job!
Suranga.
Humberto
July 23, 2020 at 11:54 am
Wo! You have a lot of these ICs.
nader
July 23, 2020 at 1:31 pm
hi
You are a good repairman.
My question is how did you notice the IC failure?
Anil
July 24, 2020 at 2:25 pm
If the supply And audio signal both present And still no sound then it is bad amplifier IC.
Raj
July 28, 2020 at 12:06 pm
Great.. thanks
Visual
May 13, 2021 at 4:41 am
I have the same problem with my Sony mhc gnz888d,. How can i get the IC changed? Is it DIY? if yes, can you let me know the IC package.