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Amp do you know of a how to or some sort of direction on how to repair the FET problem with the amp? i can solder and willing to take time

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This is the first place I'd recommend.

Basic Amplifier Repair

Let me know if you have any other questions.

Posted on Jan 06, 2009

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I just hooked an antenna to my sony bravia and it only picks up a few digital channels. I have two other Tvs hooked to the same antenna and the both pick up so many more channels. What could be the pr


i think the 'front end fet' or channel fet has failed
this amplifies the incomming antenna signal
however is the center pin of the antenna plug on the tv loose
inside the tv is a metal box this is attached too
it changed the UHF signals to a lower frequency range called an IF
the UHF signals are normaly have a path like this
antenna>>safety >>>amp>>mixeramp>>output to DTV decoder etc

the amp bit or connection to the tv is wrong
as its working quite well and gets like 2 channels

look inside the socket on the tv and examine it carefully for any bits of wire
or as i say loose connections
may just need to be soldered inside the can to reconnect the center pin

it will still give like 2 3 channels as the gap caused by the bad solder joint
will still allow some RF accross
so... its either a gubbed UHF RF amp or a broken connection or a short ... so...

Dec 11, 2014 | Sony Televison & Video

1 Answer

My peavey cs 800x amp keep cutting out one side


I just repaired a cs800 that was intermittant cutting out on one side only- The solder on the boards where the input/output jacks are connected had multiple cold solder joints and had cracked the solder around the pins- Just needed a resolder job.

Apr 27, 2012 | Audio Players & Recorders

1 Answer

Hey, I have a few Xbox 360s that originally came to me with the error 0102. I though "easy enough" so i reflowed them. Now I'm getting error 0003! turns out I forgot to bolt them down, and...


I would definitely try baking the board to fix the warping and then reflow the CPU to fix the cold solder joint(s). If that doesn't work, then go to the MOSFETs. But the only way to accurately test a MOSFET is too remove it from the board first with either a powerful soldering gun (60+ watts), or hot air. I prefer using hot air to minimize physical damage to the FET.

Here is an easy way to test a MOSFET: http://www.youtube.com/watch?v=2BU7qHWtsmQ

Because there are so many FETs on a board, it's best to start with the ones closest to the CPU. I typically start with the ones directly to the right of the RAM. If those are fine, move out to further ones. If you get through all of them and can't find the problem, you may need a new FET controller chip. This is located directly under the first 2 FETs.

You can find replacement MOSFETs and controller chips all over Ebay for pretty cheap.

Let me know how it goes. And don't be afraid to ask any questions!

Apr 13, 2011 | Microsoft Xbox 360 Console

1 Answer

Sat went out lost power. can not get tv to turn on. checked outlet (fine) sat powered up. no tv power.


When this happened it probably took out Q406 a switching field effect transistor on the power supply board along with F401 an 8 amp Slow Blow fuse. The FET will have to be soldered in if it is bad. If the fuse is blackened, it is almost certain that the FET is shorted as well.

Jan 30, 2011 | Panasonic TH-42PX60U Television

2 Answers

What does the red and green light mean ???


red and green light? there is most likely a protection and a power light. The red I assume would either be a protection light or a clipping light signal. Does the amp kick off then these lights kick on red then to green?

May 31, 2010 | Planet Audio VX4002 Car Audio Amplifier

2 Answers

When i started to plug my battery in my amp made


you have blown the actual filters that make the sound. a amp is basically a filter with the same filters on both channels on each side of the inside of the amp - channel 1 and channel 2, that pop was in the heat sinks of the amp usually. if you have replaced the fuse in this amp and you get no on light, the internal amp is in need of repair

Oct 24, 2009 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

Boss amp turns off sometimes


There must be some bad solder connections in the amp. You will need a soldering iron and some solder. Plus the skill to use them so you do not cause much more damage to the amp. It is very easy to bridge a solder joint to a close by solder joint and cause a short in the circuit and can be very danergous, even cause the amp to catch fire. If you bridge any solder joints and then power the amp on, you may very well destroy the amp beyond being able to repair it by anybody. So if you are not sure of how good you may be able to solder the board, please just take it to a service center and have them check it out for you. If it is just some broken solder connections they should be able to repair it fairly cheap. Most shops charge about $65 for this type of repair, but not all repair shjops are priced the same, so you would need to check it out first.

It is very common, for car audio especially, to get cracked or broken solder joints due to the nature of them. They get bounced around a bit even when installed properly. Every time you hit a bump in the road the amp gets a little jolt.

If your amp had anything else besides the bad connections, it would not play OK after shaking it.

If you need any further help let me know.

Feb 14, 2009 | Boss Klash K780 Car Audio Amplifier

2 Answers

800.2


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage is OK, the amp will likely need to be repaired. If that's the case, do you want to repair it yourself? This amp may not be easy to repair. If you are not interested in learning to do this type of work, you should pay to have it repaired. If you want to repair it yourself, I'll try to help you through it.

Nov 11, 2008 | Rockford Fosgate 800.2 Car Audio Amplifier

2 Answers

My amp is blown!! Dont know what part to replace.


those are likely "chips" or "integrated circuits". can you read any words, letters, numbers off it? if it's a common off-the-shelf chip you can buy from mouser.com or digitek.com, AND if you know how to de-solder and solder delicate electronic components using a hot soldering iron WITHOUT destroying them or the adjacent components. if no identifying codes on the chip, maybe google up a schematic of the board (unlikely) and figure out what it is. if it's a proprietary chip made Rockford Fosgate, it will be harder to find. Also, there could be damage to OTHER components that may not be visible, so if you go to all this trouble it might still not work and then you'd have wasted money. hopefully you are under warranty and RF can repair it. otherwise, chunk it in the nearest trash can.

Mar 06, 2007 | Rockford Fosgate P10002 Car Audio...

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