| Electronics > Repair |
| PreSonus Eris E3.5 broke when turned on / teardown pictures |
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| wildiness:
After almost 2 years my PreSonus Eris E3.5 studio monitors broke when I turned them on. I flipped the power switch and the blue power LED didn't even turn on. I have turned them off and on less than 20 times during the time I used them. There are a few comments on other forums about these speakers blowing fuses when turned on. I am under warranty for a few more days but decided to take off the back plate on the active monitor to see if I could repair it my self. The brown component(T2 AL 250V) by the red cables is the fuse and there is continuity across it, same for the black round thermistor. I also can't see any broken components or or smell any magic smoke. Caps all look good. All connectors are glued in with the nasty looking yellow glue so I am not breaking the board out further just yet. I think a lot of SMT's are hidden by foam on the underside of the board. The amplifier chip is a ST TDA 7265 and the PCB versions v1.1 2018-05-04. I don't think I can repair it but maybe some one else can spot the fault. Either way I could not find any pictures of the insides of this speaker anywhere else so I am posting these for future reference. |
| status1:
As a general way trying to fix it I would start by looking over the solder connections of the through hole components especially the taller and heavier ones I would use a 4X loupe to look at the solder joints Because of vibrations they tend to crack the solder That is the purpose of the yellow glue but sometimes they miss a spot or it's not enough If nothing is found I would check for continuity and shorts than try to power it on an see where the power stops If it's blowing fuses there is a reason for it You may not be able to fix it but you may narrow down the problem area so perhaps someone could help out with a suggestion |
| mrtrevisan:
Maybe I'd try to check wether the TDA7265 gets its supply voltage. If it doesn't, I'd go backwards till I find a supply voltage (being careful), I should get an idea of what's the broken or "desoldered" component. If the TDA does get a supply voltage, I'd then try to feed a signal into the line inputs and see wether it gets to the TDA input pins - and then output pins - as expected. If you have a reasonable supply voltage reading and also input signal reading, but no output, I'd suspect the TDA has fried for some reason. I also see there's a 3 pin TO220 device near the 400V 100uF capacitor. That too might be worth a look. My 2 cents, hope it helps. Cheers! Marco |
| Audiorepair:
If there is no blue LED, then the power supply is not working. If the power supply is not working because something is shorting it out, then you should hear some kind of ticking noises as it attempts to fire up then aborts. Better still, connect a mains lightbulb in series with the mains input if you can, you will see if something is shorting the power supply by the flashing bulb. |
| PeterL:
Old thread, but same speakers with the same issue here. This seems to be a common issue for this product. I started investigating the power supply, which wasn't working, then after a few powercycles while measuring on the primary side, it suddenly was working again. So for now I can get the speakers working by turning them off for a few seconds, then turn them on again. You could give that a try also. |
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