Question about iHome Audio Players & Recorders
My iHome radio/clock has recently started having background static which is slowly growing in intensity so that it ruins any program
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Posted on Jan 02, 2017
SOURCE: I have an old but
The most common failure is junction punch-through in the speaker driver transistors.
Identify the audio power amplifier (transistors or power integrated circuit(s). Use an ohmmeter to check for a short from the speaker output to the power supply (on the transistor this would be between the emitter and collector leads). If you have a short, the output transistor is melted and needs to be replaced. There are two transistors to check for each speaker, one to the + side of the power supply and one to the - side. Usually if one goes it ruins the other - even if it tests good, it was probably overloaded and won't live much longer, so change both of them. If this unit used an integrated circuit power amplifier to drive the speaker directly, both output transistors are included inside.
If you do have bad output transistors, you may also have to replace a fuse in the power supply or amplifier circuit.
Failure mode: transistors are made with tiny amounts of chemical dopants placed in silicon layers. After many years of operation at elevated temperatures, these dopants diffuse from their starting point. Beyond a certain point, it doesn't take much of a power surge to cause a catastrophic breakdown. A short-circuit overload could do the same thing by causing rapid over-heating. The clock runs on a different section of the power supply and is not affected by this.
I don't have specific service information on this model, but I would guess it is still possible to find replacement parts at a reasonable price. If an individual power transistor is no longer made, there is probably an improved functional equivalent available.
Posted on Dec 22, 2010
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