sorry everyone i tried to keep the title short and descriptive.
years ago perry babin helped me so much he is the man! would be willing to send donation like last time if we can fix board or to whomever helps me!
board: Hifonics brutus BXX4000.1d (yes the old version that is discontinued now)
Protect mode: yes
there were two blown 10uF 250v 105C capacitors, i replaced them both with same details. (the newer capacitors were slightly smaller by a few millimeters)
i could not see anymore damage anywhere else visually, i then proceeded to check the mosfets (as best i know how) with a multimeter on the ohm setting, and got .6 except for 4 fets (2 on each rail side), but they were different fets they read u30d20c and all the other mosfets that checked out at .6 read irfp064n p752d (i am guessing i am just reading or diagnosing them wrongly considering their different mosfet transistors and they are probably good?)
please let me know how i should proceed, i am assuming it is possibly some transistors on the driver board, but please assume my equipment is limited, i just have a multimeter but i am willing to buy components and replace them. my knowledge is quite limited so pictures would also help.
The green capacitor that is circled in red in the picture, i replaced both capacitors on the board like i mentioned. amp still in protect mode after replacing.
please also refer to picture of polarization to make sure i installed capacitors polarization correctly. double checking my work.
last bit of detail i can provide, the capacitors i replaced, like wow ive never seen capacitors completely blown, but the paper cardboard material in the capacitors was literally in pieces everywhere throughout the board. ive never seen a cap so violently explode before. looked like it got shot by a rifle, when i took it out there was nothing left but the rubber bottom stop and the metal connectors to it.
years ago perry babin helped me so much he is the man! would be willing to send donation like last time if we can fix board or to whomever helps me!
board: Hifonics brutus BXX4000.1d (yes the old version that is discontinued now)
Protect mode: yes
there were two blown 10uF 250v 105C capacitors, i replaced them both with same details. (the newer capacitors were slightly smaller by a few millimeters)
i could not see anymore damage anywhere else visually, i then proceeded to check the mosfets (as best i know how) with a multimeter on the ohm setting, and got .6 except for 4 fets (2 on each rail side), but they were different fets they read u30d20c and all the other mosfets that checked out at .6 read irfp064n p752d (i am guessing i am just reading or diagnosing them wrongly considering their different mosfet transistors and they are probably good?)
please let me know how i should proceed, i am assuming it is possibly some transistors on the driver board, but please assume my equipment is limited, i just have a multimeter but i am willing to buy components and replace them. my knowledge is quite limited so pictures would also help.
The green capacitor that is circled in red in the picture, i replaced both capacitors on the board like i mentioned. amp still in protect mode after replacing.
please also refer to picture of polarization to make sure i installed capacitors polarization correctly. double checking my work.
last bit of detail i can provide, the capacitors i replaced, like wow ive never seen capacitors completely blown, but the paper cardboard material in the capacitors was literally in pieces everywhere throughout the board. ive never seen a cap so violently explode before. looked like it got shot by a rifle, when i took it out there was nothing left but the rubber bottom stop and the metal connectors to it.
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The u30d20c is a rectifier.
Which cap are you asking about the installed polarity? Are you asking to check the polarity of every capacitor in the amp?
The green cap is likely a non-polarized cap.
Which cap are you asking about the installed polarity? Are you asking to check the polarity of every capacitor in the amp?
The green cap is likely a non-polarized cap.
thank you for your quick reply.
both green caps exploded, so i replaced them but the amp is still in protect, wondering what do i check next? noob here, dont know what to do next.
both green caps exploded, so i replaced them but the amp is still in protect, wondering what do i check next? noob here, dont know what to do next.
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Thank you!!! They are fried just looking at both tiny resistors, do you know what proper replacement i can order for both Cgnd and Rgnd? thank you
Are the replacements for the green caps polarized or bipolar?
Those resistors and capacitors vary, depending on whether the input circuit is noise cancelling or relies on a quasi-floating secondary ground to prevent ground loops.
What's the resistance between the input RCA shields and the negative speaker terminal?
Those resistors and capacitors vary, depending on whether the input circuit is noise cancelling or relies on a quasi-floating secondary ground to prevent ground loops.
What's the resistance between the input RCA shields and the negative speaker terminal?
the replacements for the green caps are polarized the one lead is longer on the cap than the other lead.
What's the resistance between the input RCA shields and the negative speaker terminal?
if i am measuring this correctly on my multimeter, at ohms 200k setting its fluctuating between 90 and 160 but seems to be around 130, the longer i stay on it it goes up or down. assuming the com side of multimeter goes on the negative speaker terminal
i read another thread with the same problem as my amp, on here, i think it is a 1k resistor for the but i am not good at reading schematics. it is post #31 https://www.diyaudio.com/community/threads/hifonics-bxx4000-1d.358045/page-2#post-6731857
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Set your meter to the 200 ohm range and recheck.
Post a photo of the area around the RCA jacks.
Does the capacitor have a line on it indicating that it has a negative terminal?
Post a photo of the area around the RCA jacks.
Does the capacitor have a line on it indicating that it has a negative terminal?
not picking anything up on multimeter on 200k ohms range. switching on multimeter to voltage rating is around .6 though
here are 3 photos, one of the capacitors i bought and replaced and the other photo of RCA jack internals
the board has this indication feature on the PCb you can see underneath the cap i replaced, i assume the pointing thing means negative side of cap? there is no + or - on the board however, just this indication feature in picture below.
If i replaced the PCB with the wrong capacitors, please link me to the bipolar capacitor needed (i tried searching could not find any "bipolar" 10uF 250v 105c only polarized)
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The following is the only single cap solution (not two caps in series) that I found reliable.
https://www.mouser.com/ProductDetail/Panasonic/ECQ-E2106JF?qs=9ouE0kzBZ2qsokZL7Ax3dg==
They will have to be mounted something like in the attached image.
Are you sure that you were measuring to the negative speaker terminal when checking the shields?
https://www.mouser.com/ProductDetail/Panasonic/ECQ-E2106JF?qs=9ouE0kzBZ2qsokZL7Ax3dg==
They will have to be mounted something like in the attached image.
Are you sure that you were measuring to the negative speaker terminal when checking the shields?
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thank you for the link Perry.
I took a video just now of measuring one of the neg speaker terminals with one of the rca shields uploading it to youtube now
Please don't post videos, if they're for me. For the most part, they are a colossal waste of time.
This isn't 130 or anything close. What changed?
If you touch the probes together, what does your meter read (200 ohm range)?
What make/model meter?
This isn't 130 or anything close. What changed?
If you touch the probes together, what does your meter read (200 ohm range)?
What make/model meter?
sorry about the video. just wanted to be sure i was doing it correctly. i am still new to alot of this and self taught.
touching the probes together on the 200 ohm range setting reads 1.7-2.1 the multimeter is a Wavetek 10xl
when it read 80-130 it was on the 200k ohms setting not the 200 ohms setting 200k ohm is the only reading i can get and it now reads 80 and fluctuates.
can you please identify or describe where power transformer secondary is located please and what it looks like. is it one of the big red power coil thingys?
multimeter was not able to produce any reading of any kind rca shields to power trans secondary on any resistance setting