Bad TDA7468 IC Caused Very Low Sound Output
The complaint of this Philips Audio/video system model FW-V520 was very low sound on both speakers even though the volume already adjusted to maximum.
Usually when this kind of symptom happened, one has to check on the audio section. It can be audio processor IC fault, corrupted memory IC and etc.
Once the cover was removed I saw three circuit boards i.e Tuner PCB, Power PCB and front panel control PCB-see the photo below:
There was another PCB board which is the main control and pre-amp PCB board-see the photo below:
In this board I saw the audio processor IC with the part number of TDA7468D. Since this IC has many functions thus I suspected this IC first before other parts. You can click on the diagram below to access the datasheet website:
Since I have the spare part with me so it would not take long for me to replace the IC and do a retest-see the two photos below:
Once the TDA7468 IC was replaced and powered On, I could hear the sound came back.
If after the replacement of the audio processor IC and the problem is still the same, I may have to start to track pin 14 and 15 of the IC that usually lead to memory ICs.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out previous post about fixing active speaker in the below link:
https://www.electronicsrepairfaq.com/universal-power-supply-replacement-in-dvd-player
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Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com
14 comments on “Bad TDA7468 IC Caused Very Low Sound Output”
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Brilliant service!
Thanks Mr Parasuraman.
Good job Suranga.
suranga.
you found the culprit very quick what lead you to the suspect?
Thanks. Yes I worked for Philips Service center years ago.
Fixing those not very serviceable-friendly Audio sets is always an uncertain task at first. Good thing you were able to pinpoint the exact cause without going to deep into the matter and saving valuable time!
Good job Suranga !
Experience counts!very good job well done sir
Suranga, that is great, you saved a lot of troubleshooting time !
Suranga, that was one heck of a good repair…thanks for sharing.
Good repair job, Suranga.
thanks for ur fault finding experience….
Hi my name is Herby I have a question regarding active speaker from the amplifier what can make the speaker stop receive power from power supply a Gemini DRS-15P
well done sir