Power supply is still good, transformer is putting out 15.5VAC. No output to speakers, suspect main board. Board shows no scorching of components, or venting of caps. Fuse good. May be IC related. may have been a victim of a UPS slowly discharging (linear voltage drain-off --110 to 0VAC) How do i get a new main board?
If your speakers have a warranty can you return that to the store with the receipt because the store will replace a new for defective product..or you can go to the web site of the brand of your speaker if you intent to buy the main board you can order trough the online shopping.
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Check for possible malfunction / heating of your amplifier power bank. Power transistor defective or leaky or else speaker terminal connections intermittent leading to disconnection of speaker load that heats up output power bank ( maybe power bank protection circuit if there not working )
Check the power bank and re-solder speaker connection / output terminals.Check for dry solders / loose connections in the power bank.
if the main fuse has blown & the device simply won't power up, replacing it will merely result in another blown fuse - you need to take it to someone who can repair the units' power supply
output fuses blow when speaker wires are shorted, or speakers fail short - they're on the main circuit board, but seeing you're asking, i'd suggest you don't open the unit, but take it to someone who knows what they're doing
Probably not. The fuses would have blown if the transformer had been overloaded.
These amps do not have output transformers. The transformer you see inside are likely switching transformers to increase the supply voltage substantially. They are pretty rugged. There likely fuses on the circuit board that you don't recognize. If there are surface mount components on the board, look for white rectangular that are square when looking from the end. Usually they will have xxA marked on them, a 1 or 2 digit number followed by an A. There are other shaped fuses, but they should all have a similar marking. Usually, the left and right amplifiers will each have TWO fuses associated with thir power supply and sometimes an additional one for the speaker.
You should look at the circuit board for the power amplifier and check for any leaking or bulged electrolytic capacitors. If this speaker uses the circuit boards made by AMI (such as most JBL and Mission sub woofers around 1999-2001 vintage) they had a lot of problems with this as well as bad modules. Google for the module S53AMI and you will find lots of info if this is what you have in that Athena.
The cheapest option is to replace the transistors (a quick check on google will tell you how much they are). If they are common transistors you will be able to find them and get them quicker then searching for a board that could be no longer being made.
If your speakers are making this noise on switch on please disconnect them and check out if they the speakers are damaged by a continuity test of the impedance. It must show the marked resistance without a short. Then you are lucky. Next open the amplifier and check out on the output side and the power side for failure of mains capacitors/ output drivers/faulty coupling capacitors. Connect a resistance loaded test- speakers whenyou do this test .Switch on and put the set on fopr voltage checks from the output to the preamp. By a signal test you will be able to analyse the gain factor of all teh corresponding stages.It might be possible that your amp is old and some electrolytics have dried up.If so put the amp on for some considerable time and confirm if there is response building up on the controls and panels slowly. If so check onthe board for the suspected passive components and replace all suspected capacitors. Also resolder the main pcb for bad connectivity. I am surre this must work but attampt only if your are familiar to doing this repair. Good day
The power adapter that blew damaged the amplifier circuits inside the sub (or a damaged circuit caused the power adapter to blow)... in either case, if you have electronic skills and access to a oscilloscope, you can trace the signal on the circuit board. The suspect components to look for would be around the connectors for the power supply to the circuit board.
sounds like you may have a short to ground on the output transistors. Does it have transistors or an IC output. It is most likely that you have not replaced a mica washer or insulator. Check to ground with a meter from the case of the output devices.