There are three transistors on the left side that have burned up under the heatsinks and i cant figure out y or where to find replacements for them this was a used amp and when i was taking it out of my old car the RCA cables were melted togather
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Re: amp has burned up
You'll need to replace all three transistors and any other in the same line (unless they're divided by high power diodes). Make sure you check all resistors before replacing anything. Search www.digikey.com for parts, they should have the exact transistors-just put the numbers on the transistors into the search field.
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means there an internal problem with the audio side of the amp and that the power side is working fine. normaly it is a blown transistor on the audio side. take the cover off and see if you can smell anything burnt and take the heatsinks off the transistors and inspect them.
If you didn't find any burned parts that would mean one of the buffer amplifiers before the power amp could have died. They could either be transistor based or opamp based. They are fairly low power so they will not explode like the output transistors like to do. Contact rockford, they should be able to send you a schematic. Let me know I will try to help you through it.
it has to have some type of allen head screws holding it directly to the heatsink . phillips screws , look closely on the amps board . transistors may also be stuck to crayotherm (material under inputs and out puts ) with that white paste everyone slabs all over them,heat and time makes it like glue .
Hiya, dont have a diag either what you will have to try and is compare the left channel with the right. There will be 2 driver transistors (also likely on heatsink) close to the outputs. Check which driver drives which output on the left, then match it on the right. Those same drivers could very well also be a problem on the right as they often go with the outputs. There is a possibilty they have smoked again. See here to test FETS http://www.4qdtec.com/mostest.html
Basically the left will match the right but not similar locations but definitely by track joins.
Also check the power resistors at the output. Often also go.
Sounds like you have fried your output transistors. They can be replaced if u have the patience and know-how. Also check the resistors near the transistors. Some of them may need to b replaced too. I fu replace the transistors and the resisitors are still fried, u run the chance of burning up the new transistors again. I usually just replace both items since it's not that expensive and I'm doing the labor. What have you got 2 lose?
If the overcurrent of DC offset lights are not green, the amplifier probably has blown output transistors.
To eliminate other problems, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up normally (all lights green), the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.
Sounds like you may have a shorted switching Transistor in the switch mode power supply causing a short to ground. If you are technical enough. Remove power remove cover and do a continuity test on the transistors on the heatsink. non of them should read zero resistance between the three legs. in all connection configuration you use to hook up your meter. If one or Two or even all of them do you must replace with proper part.
Check to make sure you speaker has not shorted. Try a different speaker. If this is not the case you could have an internal shorted transistor inside of the amplifier. or in some cases both.
If it is in the amp and you are comfortable working on the amp remove the cover and along the side connected to the heatsink. You will find the smps and the output transistors. use an ohmeter and check across the three legs one way you sould get one reading and if you flip the leads you will get another. if you encounter no resistance, no matter which way the leads are placed. That transistor will probaly need to be replaced. But check the speaker before you do anything. and the wires going to the speakers.