How To Repair Stereo Amplifier

A customer of mine brought to me the TAC Integrated Stereo Power Amplifier With the Model of AV-355 for repair. The complaint was no sound but have ability. Normally the showtime affair I do was to connect a speaker at the output jack to see if the sound really not present.

Another test is to check the output DC voltage at the speaker output jack. It should not accept DC voltage and from the test I got 35.six DC volt which mean the internal power transistor had already shorted.

Alright, once the casing was removed I could see two circuit boards  (principal and pre amp) and a large toroidal transformer-encounter the photo beneath:

From the visual inspection, I found 2  e-caps bloated on top of the capacitor casing, broken jumper wires and a burnt resistor-look at the white arrows in the photo below:

I  knew if a burnt resistor were found this means the main power amplifier transistor will exist shorted. True plenty, when I placed my digital multimeter to the transistor pin (on board) I got very low ohm on all the legs (pins). From experience,  once you have found a shorted power transistor, y'all have to cheque all related components around that circuitry. If y'all want to acquire how to accurately test electronic components you can bank check out Jestine'south Ebook HERE .

Later spending some times to cheque the circuit lath, I can't believe that there were actually 15 bad components institute which include the burnt resistor.

After the replacement with new components the stereo ability amplifier with no sound problem was finally fixed. I did not post the video thus you would not hear the audio but the sound worked!

This commodity was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.

Delight give a support past clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with united states of america, please contact us HERE.

P.S-If you lot enjoyed reading this,click hither to subscribe to my blog (free subscription).That way, y'all'll never miss a post. You can also forward this website link to your friends and colleagues-thank you!

Annotation: You lot may cheque out previous post almost fixing active speaker in the below link:

https://jestineyong.com/broken-circuit-board-fixed/

Likes(194) Dislikes(three)

Source: https://jestineyong.com/how-to-repair-amplifier-no-sound/

Posted by: norrisaffeas.blogspot.com

Share this post