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#1 |
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diyAudio Member
Join Date: Jan 2009
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I have a synthesizer here that I'm attempting to repair - I've narrowed down the problem to a cracked SMD inductor in the backlight driver section. I have another synth mainboard to use as a reference - but unfortunately the service manual for the thing is unattainable and there's no value printed on the inductor!
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#2 |
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diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
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Well, you just described how I'd do it. I've gotten pretty good at tacking tiny leads on SMT parts for measurements. One word of advice- in all my years of troubleshooting, the cause of a problem has almost never the part showing the physical damage. Unless you know the inductor was physically damaged because something hit it, there's a good chance it cracked when it overheated because something else failed.
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I used to be an audiophool like you but then I took an arrow to the knee. |
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#3 |
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diyAudio Member
Join Date: Jan 2009
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Thanks for the advice - in this case I'm pretty sure that the failure was caused by a mechanical issue rather than an electrical one. The SMD inductor in question is mounted about a quarter of a millimeter from a screw mounting hole at the very edge of the board, and I think it cracked due to concentrated mechanical stress from the board warming and cooling and the synth being banged around. The failure is intermittent and only seems to occur when I pick the synth up and move it around, or I tap on the inductor with a probe. I will take another look around it to make absolutely sure, though. Now to build some nanoprobes
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