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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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In article , "news.rcn.com" wrote:
This is an Insignia Model: IS-HTIB102732 progressive scan home theatre DVD receiver. It was accidentally plugged it into a 220 volt source and "clouds" of white smoke apparently started coming out of the left hand side where the power supply is, even though the person who did it says it wasn't actually turned on. (surely if it was unplugged, plugging it in would put it into stand-by mode, - it wouldnt try to turn itself ON?) The wall fuse blew about five seconds after it started smoking. The unit does however now turn on! And it seems to work. And I cant see any damage to the power supply area on the left of the unit! Curiously there is what looks like a fuse on the power supply board which doesn't even look blown? The problems for which it has come to me are that it seems to have lost dynamic range (though I have no way of knowing what dynamic range it had before it started smoking), the left front channel power seems very low and the DVD displays for a few minutes then the picture gets very choppy. Does anyone know if any of this can be traced to whatever is powered when the unit is in standby mode? Logic seems to dictate that the only thing needed to be powered wjem in standby mode is the remote unit and that seems to be working. I have difficulty in believing that the left hand power transistors or the servos to the DVD laser were powered when the smoke incident took place. It does tout itself as a 1000 watt unit which seems to me more than a bit like a very 1960s looking figure. The speakers are incredibly tinny looking and the sub is made predominantly of particle board. The unit has no weight to speak of to support any sort of power transformers supplying 1000 watt transistors and heat sinking to them looks minimal. I suspect the impedance is under an Ohm (and I have it connected to ordinary 8 ohm speakers at the front) (Yes, it IS made in China) Subtract 2 zero's off of that and youd more likely have the correct wattage. |
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