Question about Yamaha RX-V795 Receiver

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Amplifier switch off immediately when it switch on

Regulator transisters all in working condution

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Problem at output drivers.

Posted on Mar 30, 2014

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Posted on Jan 02, 2017

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We have a marantz PM-44SE amplifier and the speakers are really quiet?


make sure all your speaker connections and your phono lead connections are good and connected properly.also if you have the correct source(input for cd player etc.)pressed in,this could also be the correct speaker setting(a or b speakers)if your amplifier has a+b settings.check your speakers at the back to see if there are any switches,or if they are bi wirable(if they are bi wireable you will need two sets of wires running to both speakers from both speakers (a) and the (b) terminals,as if this was the case and you are only using 1 set of cables then only the treble may be working without any bass or the other way around.you could also look at your phono leadsby giving them a light twist to see if there are bad connections,if not if you can try and ask a friend or neighbour to try the speakers on their sound system and then you will know if its your amp or speakers that have the problem.i suspect it is your amp,if you have tried these things and got nowhere then you may have blown your output transisters and would be better off getting a new amplifier as it would cost too much to repair.only you know when the problem started and if it was by playing the amplifier too loud for too long then the volume dropped right down the it is probably the transisters that have been blown.hope this helps

Jan 07, 2013 | Audio Players & Recorders

1 Answer

Dear sir , i have sony trinitron kv2552 m9 crt 25 inch tv i need the transisters on that tv , is this the transister str 50115 on this tv please tell me.


It is not a transistor. It is an STR [Switching transistor Regulator]. Actually it is an IC, used at its power supply regulator section as main power switching regulator. Check this link to see its picture.

For more details type in this site name "Electro-help" (DO NOT copy and paste the site name from here. Doing so may lead you to wrong place) to search box of your search engine [not in the address bar of your browser], and press "Enter".

It is an electronic equipments service help site.

Note the position of hyphen in between words in site name. The site will appear as it is in web; subtitled as Service help to electronic home entertainment equipments.

Pull up older posts.

You can locate this site, either at the bottom part of first search page, or at the top of second.
Detailed descriptions are there to help you.

Sometimes, entering ads by the side and bottom of each post here might give you details of its availability and local price.

Jun 07, 2012 | Sony FD Trinitron KV-32HV600 32" TV

1 Answer

I bought a factory refurbished xga-3000 gemini amplifier and conected it to my behringer mixer expecting a thump. but it barely sounded like a sound of earphone at maximum volume. I read power supply to...


A large amp like this likely has protection circuit (probably a relay) that doesn't connect the speakers until the amp is stable and balanced. You relly need the schematics for the amp.

Jun 21, 2011 | Gemini Sound Products GEMINI XGA 3000 3000...

1 Answer

When I turn on the amp it turns on, but it doesn't amplify my guitar/ work at all.


Check the power transformer first to see if tou are getting power to the amplifier section. If you are getting power, your problem is probably the power transist is bad.

Oct 04, 2010 | Pyramid GA610 600 Watts Dual Channel...

1 Answer

Blowen transisters


Unless you can test the circuits to determine the failure and check for the predriver stage for any failure do not try to change. You must be familiar with the junctions, the type of the transistors before you try, they could be a complimentary pair driver too. so if familiar buy the same rating, desolder from the pcb, care to see for the correct junction, insert the Base, collector , emitter leads carefully solder and test after rechecking once again. otherwise get help.. Good day

Jul 04, 2010 | Power Acoustik GOTHIC OV2-1600 Car Audio...

1 Answer

When we turned on our large screen panasonic tv there was a pop, then no sound. The picture is fine. It is several years old. Not a flatscreen. Large speaker at the bottom.


It sounds like the power transister for the amplifier has blown. Inside, it is usually the largest transister connected directly to a heat sink. It will require the ability to solder (and unsolder) in order to affect the repair. Look up the transister from its code inscribed on the case to find a replacement. Power transisters are usually not very expensive. You can go to this link to see what a typical power transistor looks like.
http://innovision-group.net/catalog/index.php?cPath=1_37

Jan 26, 2010 | Televison & Video

1 Answer

Ps 52 kx power supply will not hold load


thank you for your help . I have already fixed the power supply I double checked the transisters and found three bad so I replaced all the power transisters and it is fine . thanks again bob

Nov 17, 2008 | Pyramid - PS21KX 20 Amp Power Supply Car...

1 Answer

Formula Mach-5190


u will have to have all of the transister looked at ..when one goes bad ....let me say it is not just that one ...you can try radio shack...or do a web seach ...good luck

Jun 23, 2008 | Formula MACH5000 Car Audio Amplifier

1 Answer

My 52 in


Chirping is usually a problem in 2 areas of this unit. 1st check 3 legged regultor on the right side of the chassis, also 2 small transisters and 2 resisters near and in front of the regulator. RCA has a kit for this problem, the second is check the horizontal output transister is on a separate heat sink along side of the Flyback Transformer, it shorts and pulls down the regulator power supply.

May 28, 2007 | RCA P52960 52" Rear Projection Television

2 Answers

One channel not working


could possible a bad bias resister. easy enough checked with a meter for ohm. also check around the circuit one the side that gets hot see if the transisters farther in are getting hot as well of if they seem out of range on a meter. One thing I have found is if you look carefully at an amplifier stage it is pretty bisymetrical. so use measurements from one side to compare to the other. Sometimes this will give clues.

Aug 04, 2006 | Verge VGA285 Car Audio Amplifier

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