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ALPINE MRV-T757, BRIDGED AND BLOWN




By RON7525 on Jul 03, 2008

" "
MY CUSTOMER BRIDGED THIS WRONG [PLUS TO PLUS ,NEG TO NEG. AND IT BLEW ALL SIX TRANSISTORS ON THE BOARD. I TRIED TO ORDER THE PARTS, IOR International Rectifiers IRFZ44N. FROM ELECTROSONICS, THEY SENT ME A REPLACEMENT FROM NTE , NTE MOSFET-POWER N CHANNEL PART NO. NTE2395. INSTALLED AND TESTED WITH POWER AND NOW TWO OF THE NEW PARTS BLEW AGAIN. ....... CAN WE STILL SAVE THIS OR WHAT?
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Solution #1

posted on Jul 03, 2008
Not Rated)

Abrsvcs
Abrsvcs Expert Moderator

Rank: Guru 
Rating: 88%, 1859 votes
The problem is that the driver circuit is also damaged. Try powering up the unit with the output transistors disconnected. Measure each pad and report the results here. You should see something like 0.6,B+,0.0 on each set of three. Some will be negative rather than + (-0.6,B-, 0.0).

Keep us posted.
Dan

Solution #2

posted on Jul 03, 2008
Not Rated)

micromaster
micromaster

Rank: Wiz 
Rating: 82%, 779 votes
did you have test all other capacitor & resistor..on the board, could be some parts maybe faulty and can cause of this other parts blown..
This Problem Also Relates To: Audiovox AXTM-600 Car Audio Amplifier Kenwood KAC-7201 Car Audio Amplifier Kenwood eXcelon KAC-X812D Car Audio Amplifier Sony XM-2200GTX Car Audio Amplifier Digital Audio 2, CHANNEL 600 WATTS HIGH POWER CLASS A/B AMPLIFIER DA2200W Car Audio Amplifier Pioneer 250WX1 360X1 800W MAX CAR AMP Car Audio Amplifier Clarion APX201.2 Car Audio Amplifier

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