Question about Sherwood R-945 Receiver

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What is an output transistor?

My p-965 shuts itself off after 3 secs

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Output tranisister is the transister that give the finial output of sound.
some use a output IC for the same purpose.

Posted on Sep 03, 2008

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On my kenwood VR-5900 twospeaker wires touched and the reciever clicked off now when you turn it on it comeson for a sec. then clicks and shuts off. none of the fuses inside areblown what could be the...


When the two wires touched the short overheated and blew the output transistor or transistors. The unit needs to be repaired or replaced. It only takes a momentary touch of the wires to blow the output transistor. It is not a fault of your particular amp. It is common to all Solid State amps. Tube amps that have output transformers are not susceptible to this problem. Always shut off the amp when connecting or disconnecting the wires.

Oct 29, 2013 | Audio Players & Recorders

1 Answer

My rca HD52W59 shut itself off; i can power it on and i get a few seconds of audio, but no picture, then it shuts off. The green power light does not blink any sequences


This may be an indication that your H.O.T 'High Output Transistor' that is the main transistor that supplies the High Voltage to the 3 CRT's when the TV starts up. Just a thought.

May 24, 2012 | RCA HD52W59 HDTV Projection Television

1 Answer

Will not stay on


gwm_inc, Please verify all speakers work or are not shorting the outputs of this Yamaha 100w/ch amp. Also this unit could have bad capacitors and or failed output transistors if the speaker terminals or connecting cables get shorted. I would guess that the power supply is detecting a FAULT condition and is shutting itself down to prevent a catastrpohic, nonrecoverable failure event!! Best shot would be to have a technician evaluate unit. 12fixlouie

Jun 04, 2010 | Yamaha HTR-6030 Receiver

1 Answer

My kenwood 107VR keeps turning off on its own, after about 3 secs it shuts off and the light blinks.


If you are sure your speakers are good. This unit has a protect circuit keeping the unit from turning on. This recevier uses an ic instead of output transistors. A ic incorperates transistors,resistors,capactors in one assembly for size and costs. There is a number right on the front of the ic ,you can go on-line to buy the ic is is fairly easy to put in as long as you can desolder and solder in.

Apr 17, 2010 | Kenwood VR-209 Receiver

1 Answer

Flashing protector


This usually means an output transistor is shorted and the amp is protecting itself. There are usually 2 8 amp fuses GMA type (glass tube) that are located near the large transformer on the main board that also get blown. You can try the fuses and see if it fixes it (10% of the time it will). If they blow again, it will be one or more output transistors are shorted, and the unit will need professional repair.

Jun 13, 2009 | Sony STR-DE435 Receiver

1 Answer

Philips 60PP935217 60 in. Rear


I would check the regulator transistors and then the horizontal output tarnsistor.

Apr 09, 2008 | Philips 60PP9352 60" Rear Projection...

2 Answers

No power


disconnect everything from the unit and see if it still does it.
if it does i would check the output transistor (ic).

Jan 25, 2008 | Sherwood R-945 Receiver

1 Answer

Proview Pl926wbi


This is an inverter board problem. The inverter supplies the high voltage and frequency to run the CCFL backlights. The board has a sensing circuit to shut down the output if too much current is going to the backlights or it will shut down if the transistors overheat. I have replaced transistors on some boards with higher rated transistors and they have worked great for years. Sometimes it is just a cold solder joint on the inverter board. Replacement boards are expensive but not too difficult to replace. Repair requires some ability with electronic boards and should not be attempted if you do not posess the skill. You could end up damging other parts that cost more.

Jan 18, 2008 | Proview PL926WBi 19" LCD Monitor

1 Answer

Sanyo DS31650 31


If the set runs at all, your flyback and output transistor are good. If the set shuts down after a few seconds and the sides are wavy, it usually means that the main B+ in your power supply is too high and not regulating properly. I do not know what kind of power supply that model uses, but if has an old-style STR regulator (like the STR30130) then it is probably shorted, and if the set uses a switching power supply then look for an open or leaky electrolytic cap on the primary side. If the power supply is working correctly and the set shuts down, check for an open safety cap (the large 1.6 - 2Kv cap connected to the collector of the horizontal output transistor).

Aug 17, 2007 | Sanyo HT32744 32" TV

1 Answer

It keeps turning off


The audio output ICs or transistors are blown. Solid state elctronics are not very forgiving when they are shorted. it takes one tiny instantance and the componets will fry. sorry to be the bearer of bad news but you will need to have this unit serviced or replaced, And never ever work on any type of electronics with the power still on. Good Luck

Apr 07, 2007 | Yamaha HTR-5830 Receiver

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