BOSE 321(No sound)

[@echo405]

Mine has very low bass. What's causing it?

[@aa0517748]

Mine just turns off on its own. It’s over 20 years old

[@deepakdhoundiyal4952]

How supply out from transformer for mosfet circuit

[@TheJerbau]

Hello I own two of these 321 models but on one of them, the sound is too low. On level 15 you almost hear nothing. Does anyone have an idea?

[@glenntips]

Maybe the mute transistors or a missing voltage at the pre amp

[@karaors8970]

Nice video bro.

[@FSrizza]

Hey I have a Bose 123 acoustic module and it just randomly cut off for some reason and I was wondering if you know how to fix it. Thanks

[@FSrizza]

It won’t power in btw I was listening to music and it just completely cut off

[@glenntips]

​@@FSrizza check at the power supply section, maybe its a loose conections or cold solder

[@ndjadhav1985]

Sir i use bose 321 but some noise in speaker so what is solustion this plz send me thanks

[@glenntips]

What kind of noise do you hear?

[@ndjadhav1985]

@@glenntips Noise like Hunny bee sound

[@ndjadhav1985]

hamming in speakers

[@glenntips]

@@ndjadhav1985 usually its the large capacitors that cause of humming, is there a sound?

[@LuisArielViolla]

hello, good afternoon. my bose321 does not hear the sound at all. I replaced the IRFZ44N but it still doesn't sound. Could it be a problem with the TDA7396?

[@glenntips]

How much voltage did you measure on the big capacitor? if its high it won't really work, it shouldn't exeed 18 or 20 volts

[@LuisArielViolla]

@@glenntips Thank you very much for answering! I made the measurement on the capacitor and I have 23vcc with everything connected. AC voltage is 120v. What else could be happening?

[@LuisArielViolla]

@@glenntips I replaced the R10 with one of the same value and it burned me.

[@glenntips]

@@LuisArielViolla check where the burnt resistor is connected, maybe there is a shorted, check all parts that connected to pin1 of the mosfet

[@LuisArielViolla]

@@glenntips The problem with the R10 was mine, that I made the wrong banding and it was 1 k. The one I was putting on it was 0.1 k. I did the measurement that you recommended in the IRFZ44N mosfet and detected that it had continuity in the 3 pins. I took it out and measured it outside and it also gives me continuity. I put a new one, I check it before connecting it but after connecting it to the source it burns again.

[@AlejandroMorales-mf3zm]

How’s connect

[@Sithforge]

Hi bro, I have a device like yours, out of nowhere it started making interference noise when it is set to Dolby 5.1. But when it is in 2.0 it doesn't. Do you know what it could be?

[@glenntips]

Try to move the wire connected to the bass speaker sir, maybe there is a broken wire or cut off

[@AlejandroMorales-mf3zm]

Como se conecta

[@j0eyb0yc45]

Sir tanong ko lang Bose 321 din akin, tumutunog pero walang display play ako ng cd hula hula nalang sa remote any idea sir..salamat

[@glenntips]

Baka tuklap na ung polarizer ng lcd sir

[@joelcestina9545]

Gud am po I have 321 it's have humming sound and it's getting hot even the speakers ?

[@glenntips]

Oh may dc out po amp ng 321 nyo kaya uminit pati speaker, need repair na po

[@joelcestina9545]

@@glenntips San po shop nyo at mag Kano aabutin sa labor? Salamat po

[@glenntips]

@@joelcestina9545 laoag city po

[@joelcestina9545]

@@glenntips sir gud pm po abot po sya ng 16 v yung sa may MOSFET nya nag palit din po ako ganon padin po

[@glenntips]

@@joelcestina9545 don sa amplifier sir hung mo muna ung input signal, pag nawala ung dc sa speaker sa pre amp ang may problema, kung nag resolder karing sir double check mo baka may nagdikit

[@dondesdeJoseMarry]

San loc mo brad? May bose ps321 II diti bka kaya mo repair.

[@glenntips]

Ano issue nya sir?

[@dondesdeJoseMarry]

@@glenntips nasaksak sa 220 v 110 v lng sya

[@glenntips]

@@dondesdeJoseMarry ilocos norte po location ko, may gumawa napo ba?

[@jojittv9573]

Nice