JL E6450

JL e6450

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Hi every one
I have JL e6450 the number Q50(irfz44r) and Q49 (irfz44r) was barn i order some from AliExpress and change it but still same problem its going hot, with out connect the speaker.
as will the voltage when i reed it from the amp its give me 6.40V in the meter
any idea what is the issue
thank you for your help