Olik Amplifier Right Channel No Sound Repaired
Customer sent to me this Olik brand Amplifier with the complaint of right channel don’t have sound. I have tested it and it was true that the left channel was working and the problem was in the right channel. Since I have confirmed it was the right channel that got problem, I opened up the cover and head straight to the right channel section of this amplifier.
Just by visual inspection I saw a burnt resistor and the FET nearby was cracked. Take a look at the photo below:
I took the FET out and tested it offboard and it was open circuited (below photo).
The value of the burnt resistor was 220 Ohm and I replaced it with a bigger resistor due to that I can’t find the exact size of the resistor.
I further checked on all the corresponding components and concluded that there were only 2 bad components (burnt resistor and open FET).
I replaced the two bad components and powered On the amplifier and it was working fine! I’m glad that there was no other bad components, if not I may have to spend more time on the troubleshooting. Take a look at the two photos below:
Conclusion- Before you start to troubleshoot any electronics circuit, you must use the visual inspection method first to save time. If you can’t see any burn components or a leak of electrolyte from the electrolytic capacitor then only you power up the circuit to start checking the DC voltage or signals in the circuit.
If you are a beginner and wish to learn how to test components and be able to troubleshoot general circuit boards (not the complex boards), you can check out Jestine Yong’s ebook here on basic electronics troubleshooting and repair. Remember, as a baby you need to learn how to crawl first before you begin to stand and walk. Master the basic first and you will slowly understand the rest about electronics troubleshooting tips and tricks.
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 his previous post about Panasonic Hi-Fi With Error F61 Repaired
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Albert van Bemmelen
August 16, 2021 at 6:53 pm
I wonder why you mentioned the resistor but still kept the power fet a secret. It wasn't even visible on the photo of that fet you showed?
Parasuraman S
August 16, 2021 at 8:50 pm
Good Job there! What was the number of the FET?
Yogesh Panchal
August 17, 2021 at 12:05 am
Good Job!Suranga
john
August 17, 2021 at 11:42 pm
Good job sir, but if i may ask, the bigger resistor that you replaced is it the same value or different? or its just the size /.
Lee
August 19, 2021 at 7:39 pm
I would of replaced both Fet's .I do this with all the amp I fix as it should alleviate any come backs.
Carlos Bielli
September 2, 2021 at 5:55 am
Well done. Good job. A sugestion I learned 53 years ago. To install the bands of all resistors with the firs band to the left (as in the original amplifier) and the value of all components readable, when possible.