Question about JVC HX-D7 Shelf System

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Two linear IC

There are two of these black boxes you describe on the heat sink. which one needs to be replaced? the one without the white coating touching the heat sink?

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Depends you need a digital multi meter to check. make sure the plug is out of wall socket, set multi meter to diode check, ( the symbol on the dial will be an arrow head with a line across the point). put the probes on legs 1 &3 then 1& 2 then swap the red & black probes in to opposite hands and do the check again,if any of the readings are 000 then that is the suspect tranny. take it out and test again while its out of the circiut board,if still reading 000 then thats the problem and it needs replacing. shouldnt cost more than a fiver

Posted on Jul 23, 2008

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your problem is your linear intergrated amplifier chip has blown, or has dry joints. causing you system to go in to protect mode which stops more damage being caused and fire not occurring. if you have no technical back ground in electronics, then i wouldnt attempt repair yourself. if you have take cover off and on the long metal heat sink there is a black like box with between ten and thirty legs going in to circiut board thats your problem, theres a code on the front of it with 2 or 3 letters then a number, thats your part number they range in price from between £7.00 to 50.00 pounds.. hope this helps

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