Question about Mitsubishi WD-Y57 57" Projection HDTV
It's possible that you have a fried diode on the secondary side of one
of the power supply transformers. Look for one that reads like a wire
on an ohmmeter. Note that some diodes come in TO-220 packages so they look like plastic power transistors. (Don't be fooled by capacitor bleeder resistors - if
present, these are in the tens to hundreds of ohms, so this is what you will read instead of the diode if the diode is good.) The whistling
noise could be a switching power supply transformer with an overload as a result of the diode, although the primary-side power controller circuit should shut down immediately before letting that happen. It could also be coming from the speakers - that would be a hint to check the power supplies feeding the audio circuits.
If after that you are sure all of the internal cables are connected, especially to the light engine, it's time to start checking voltages and waveforms, beginning with the power supply. You apparently have power to the bulb and color wheel, and probably to some of the control circuits, but that of course is not all of the set. Most sets have some fine print on the power supply circuit board telling you what the voltage outputs are supposed to be.
Posted on Oct 13, 2010
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Posted on Jan 02, 2017
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