Mackie SRM450 Active Speaker, Tips to know how to Repair partially dead amplifier board.

[@PowerToneAudio]

nice, straight forward repair , still lucky because the IC chip driver of the 2 mosfets survived, normally when the FEts shorted it damage the chip as well. and for safety purpose you should have check first if the power is turning ON, check if DC voltage coming out from the speaker terminals before fixing it to the speaker box and making audio test. It might burn the speakers if DC voltage is present on the speaker board terminal , as i say safety first but anyway nice repair .

[@TKFElectronics]

Thanx bro

[@supersilve]

You are lucky as usually when mosfets blow they burn the gate resistors and also the mosfet driver chip. Having such a strait forward repair made it rather easy.

[@TKFElectronics]

I am not lucky bro customer is lucky as he don't have to spend more money.

[@NGL_652]

Sir...mere pass mackie srm450v2 active speaker hai...usko power on krtehi thermal signal wala light blow krta hai..kya problem hua hoga sir plzz reply🙏

[@raybin6873]

Should've put heatsink compound on MOSFETs to heatsink surface to assure adequate cooling.

[@TKFElectronics]

It would be more better if you use heat sink compound for every high Temperature components.

[@crisfiler6128]

Hi my pair of 450 s(Italian mk1) one is hissy when nothing plugged into it and the other the bass is distorted (driver checked ok) Any idea of problems?

[@datomkheidze9774]

Hello bro, srm 450 v1, noise from HF speaker when nothing plugged. Problem is from amplifier. What is about price for this problem?

[@manselima8641]

Alo sou de Cabo verde tenho um problema igual quero ajuda por favor

[@NGL_652]

Sir...yeh speaker mobile se chalane k liye xlr to 3.5 mm jack chahiye na???? Balanced ya un balanced?

[@TKFElectronics]

Just Ep to XLR chahiye

[@NGL_652]

@@TKFElectronics thank you

[@dhakaboy1]

So, all I need is a Voltmeter, and screwdriver and the parts correct ? During testingI could not see which terminals you are connecting to, I am not an electronic engineer. Also, during testing, is the power completely off, or at one time it has to be on ? I am not sure.

[@TKFElectronics]

Thank you for watching my video sir, I am sorry that u r not able to view clearly testing points, actually I recommend if you are not qualified technical person pls do not attempt to repair it sir, & by the way during testing voltages unit must be in ON condition where as during testing ohmic test unit must be in OFF position. But most importantly is always check any Malfunctioning Power supply board in series.Do not connect directly to Main AC power.

[@fredflintstone2077]

Two of the large mains filter caps were knackered. Tops bulging right out. Should have changed them whilst it was apart as a precaution..

[@Tronzoid]

I have a couple mackie powered speakers with the same capacitors. They have a black plastic top that make the tops look deceptively bulge-y even when they're good. Not saying definitevely that they aren't messed up, but impossible to tell from sight alone.

[@fredflintstone2077]

@@Tronzoid They don't bulge when new. As they start to fail they pressurise inside which results in the bulge. Eventually they will fail. It could be years or they could go "pop" tomorrow. They are designed to bulge so the eventual "pop" will be a lot less. Most of them have weak points built in to let the pressure escape once it reaches a certain level. This avoids a much bigger bang.

[@fredflintstone2077]

@@Tronzoid One of my Mackie's has 6 large filter caps and four are bulging but it is still working fine. I'll change them at the next service.

[@Koflex]

Can the whole board be replaced if the repair is not successful? I think mine is damaged beyond repair. And where can I find the replacement?

[@TKFElectronics]

Better buy new system only instead of thinking of replacing whole main Board

[@chandrashekharkshirsagar4418]

Sir, my srm 450 v2 active sound reinforcement system is giving shrill on turning "signal present" knob. One of the engineer changed the potentiometer with 6pin in line 50k value (available in the market) but the problem is not fixed. As per schematic it should be 10k potentiometer. Can you make it available or suggest me a shop where I can get it at Pune.

[@TKFElectronics]

10k pot is very commonly available in any electronic Market & i am sure in Pune also available

[@chandrashekharkshirsagar4418]

Only 50k and 100k pot are available in nearby pimpri market.

[@TKFElectronics]

See Replacing 10k pot or 50k, doesn't matter much, if still your problem not solved it mean something else is their Bro

[@chandrashekharkshirsagar4418]

Thanks you sir so much for your guidance and sparing time to solve the problem. I am trying to get 10k pot. On getting will try. If still the problem of shrill exist, i will contact you for further guidance. Sir I wish to know from where you belongs.

[@TKFElectronics]

Thanks for your compliments I am from Mumbai.

[@fclightsandsoundvlog5175]

My srm450v2 have power but totally dead i change mosfet ic and mosfet but no sound icheck tha gate voltage and bypass the mute but no sound what i will do

[@TKFElectronics]

After replacing MOSFET ic & MOSFET with new, still SMPS power supply is not getting ON

[@DineshYadav-jh1up]

Sir please zayper amp. Per video banay

[@TKFElectronics]

Ok bro

[@vinodvyas836]

Sir kit ki prais kya he

[@micheldelva1918]

I need a board for Mackie SRM-450 V2 ACTIVE SPEAKERS

[@TKFElectronics]

Dear Bro, new board not available but old one can be repairable.

[@mrchinni1438]

My studio mastar b400working 2minnts good next time clip light on not working

[@TKFElectronics]

May be their is problem inside circuit

[@muzikagyvai6673]

hello, guys I have 2 mackie SRM450 v2 amps, for repair, who gona take this for repair?

[@TKFElectronics]

What is the problem in it Bro

[@muzikagyvai6673]

@@TKFElectronics They are stopped working, I don't know what is the problem. how much it cost to fix amplifiers?

[@TKFElectronics]

Your location pls

[@muzikagyvai6673]

@@TKFElectronics SM6 9BY