Nokia 5800 Ringtone Buzzer Audio IHF Speaker Repair

  
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before proceeding to this steps make sure that you already done software calibration and the basic steps on how to check audio circuit components which I already explained here: I also preferred the audio circuit schematic diagram, for easy tracking, by which you will also learn in this manner of procedure in the future of your repair career. Now,
Nokia 5800 Ringtone Buzzer Audio IHF Speaker Repair - schematic

the Nokia 5800 xpressmusic schematic diagram shown below an audio circuit which is feed from a the audio codec IC (not shown on the picture) Unlike most Nokia Audio circuits in some models, the 5800 xpressmusic has an audio amplifier chips or IC that amplifies the audio signal before it goes through the IHF ( Intermediate High Frequency) Speaker. This chip also designed to controls the audio signal`s volume. It has two channels, the left and right channel, which is so-called stereo type amplifier. The components layout and connection path lines with each certain components from the schematic diagram is in the picture below. The chips layout which I in-lined with colors indicates each certain components that are being shown or listed from the schematic diagram in the above image. Assuming that we already restore or flash it with its original or desired flash firmware and been already test the speaker working fine, but the problem still exist, 1. Determine which channel or speaker got no sound output. the left channel is where I colored "pink" and the right channel is colored "red". if both channel speaker got no sounds output, preferably the problem lies from the audio codec chip or from the audio amplifier chip, but don`t rush on there that quickly, it`s unsure yet and ain`t that easy to determine which one causes the problem. Always start from outer layer of the whole circuit, 2. Check the following output filter coils,...



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