Car power sub amplifiers is always a beauty having it when wanting more kick on that bass when playing up beat music. There are so many to choose from. Ever heard about SOUND MAGUS power amplifiers? Well man! From the outside it really look sturdy and built to last. All aluminum casing, the mainboard is a beauty too, but also subjective to failure.
Hear i will show you. This is a SOUND MAGUS C160 power amplifier and in need of repair. It just died. It does not power on. Sometime, the switchmode converter circuit has been the culprit. The circuit transform the 12v power input to split rail supply needed to supply the amplifier circuit and the preamplifier.
So common you can see a TL494C ic controller. Almost all car power amplifiers uses it. Even the ATX supply of desktop computers uses it. A common on every switchmode power supplies.
This 160 car amp board is made with smd components and not the ordinary hole thru electronic parts. Repairing it is complex than the later. But even without a schematic diagram to deal with as long as you know how to read and trace every components attach to it. You'll never be lost in repairing it.
After thorough inspection first. We can see corrosions. It means moisture before was present. Green powder stuff was visible, and when it is there. We know it eaten some of the copper traces and even some smd components.
Capacitors must be checked every one of them. Amplifier sound output depends on them a lot and when they fail, everything fails.
First remove a single capacitor and test. If the value is not near the stamp value. You will know for sure everything a like will be the same
After removing the filter capacitors of the power supply section. More corrosion is present underneath the part. So that is why the unit is a total deadset. Clean by electronic board cleaner, scrape the green stuff and put UV activated PCB coating. Join all broken traces.
Replaced all cap with new ones.
The problem of this C160 car amplifier are dried smd electrolytic capacitor, broken copper traces due to corrosion, bad tl494c IC and corroded external components.
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