Question about RCA RT2770 Theater System

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Power comes on, makes a high frequency (roughly 15khz whione...and shuts off....

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Shorted diode in the power supply. This unjit has issues with the power supply.

Posted on Mar 03, 2010

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Posted on Jan 02, 2017

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I have a Yamaha HTR 6180 reciever and 2 AR 328ps speakers one of the speakers when turned up with shut the reciever down I did a prosses of elemination and took each speaker out of the tower individually...


A capacitor is more like to fail than a coil, so I would also suspect a cap first. Capacitors conduct high frequency more than low frequency, so this may explain the extra load and shutdown on high frequencies.

Jan 21, 2015 | Yamaha Audio Players & Recorders

2 Answers

Have a LD195EMX flat screen, makes High pitch noise when turned on. C201 And R201 Look ok, not leaking or bulging, C631 look good as well. Any other porblems I should look for before I change thes


there is no HV build-up in the switched mode power supply when it's switched off, of course it will provide current when called on if powered, but the discharge resistor drains that from the output capacitor quite quickly when powered down.. this is shown often by a standby LED going dim when unplugged on most electronics... leave it a few seconds after unplugging & you'll be fine (not like the old CRT's used to be... lol)
hope that helps you out, good luck with the repair.

Nov 24, 2017 | Televison & Video

1 Answer

On_Off light blinks three times but power will not come on.


Hello
Your tVs horizontal output and oscillator has some trouble with it. When the power supply gets ON, the horizontal frequency that drives the horzontal output section won't generate the horizontal frequency, that output section wont' work, the main system control microcomputer IC will sense this situation, and give shut off signal to the power supply. That is happening now with your tV.
A through checking on the main board should be done to detect this fault. you must have sound knowledge in electronics, how the TV works. Also must have all testing equipments with you including a high quality digital multimeter. Normally this fault occurs due the main chorma-video jungle IC. But before replacing it, you have to check all other components in it. Some loose soldering contacts may also make this problem.
If you have the ability and skill, Inform me. I'll assist you. OK.

Jun 27, 2011 | RCA 32F530T 32" TV

1 Answer

Noise from dc adapter asus a6rp


A high frequency whistling sound may indicate a capacitor in the AC power adapter is beginning to fail, but it will often whistle while it works for years to come. You don't have to replace the AC power adapter just because you can hear it, unless it gets worse and worse over time or it gives you a headache. Because AC adapters employ switching mode technology, they are more likely to make noise when the battery is fully charged and the laptop is turned off. AC adapter bricks are usually glued shut and aren't designed for consumer repairs, so unless you have solid electronic troubleshooting skills and a source for parts, it's a question of living with it or replacing it outright.

Oct 22, 2010 | ASUS A6Rp-AP067A Notebook

1 Answer

My tv makes a high pitch noise and is getting longer and more frequent, can you suggest a solution. thanks


The squeel you hear is created by a part wich is vibrating (resonating) at the horizontal Frequency - approx. 15KHz - To stop the noise you have to locate which part is vibrating and either replace it or isolate its vibration - The parts which commonly vibrate are theFlyback transformer or drive/pincussion transformer or the yoke. Each of these parts have hazardous voltage and High Voltage present so care should be taken when working around these areas.

Sep 20, 2009 | Sharp 25K-S100 TV

1 Answer

Sound


I'm not familiar with your system but generally, reducing the lows and highs will make the voice frequencies more prominent since they roughly between 300-3,000 Hertz.
Some systems have range/filter selections that allow you to choose between voice and several music types.

Aug 28, 2008 | Durabrand STS92 System

1 Answer

Transistor


The first letter: A = Ge material semiconductors, B = Si material semiconductors, C = GaAs material semiconductors, R = Compound material. The second letter: A = Diode (low power, signal); B = Diode (variable capacitance)); C = Transistor (low power, audio frequency); D = Transistor (power, audio frequency); F = Transistor (low power, high frequency); L = Transistor (power, high frequency); R= control and swithching device); S = Transistor (low power, swithching); T = thyristors; U = Transistor (power, switching); X = Diode (varactor, multiplier); Y = Diode (rectifier); Z = Diode (zener). So the BC547 is a Silicon low power, audio frequency transistor. Hope that helps!

Sep 26, 2007 | Nokia 1100

1 Answer

Model 55X70 Toshiba Projection tv


dont know about warranties but horizontal lines means your horizontal frequency which runs about everything has drifted off sync and if too high or low it will activate shut down circuits in high voltage and power suppy, even causing HOT transistor to short. good luck and call a tech.

Sep 01, 2007 | Toshiba 55HX70 55" Rear Projection...

3 Answers

High pitched noise coming from set.


No my freind, without being there and looking around its a guess that the noise you hear is from the switching Power supply or SMPS(switch mode power supply. it could be an indication of something to come, as a breakdown as maybe the power supply is being a little bit overloaded for some reason, or could just be a loose transformer or coil winding. Not alot to do with it unnless you locate the source. i would contact Samsung and see if there are any problems like this for this model. If they dont know then the best advice im sorry to say is live with it or call in a tech to check out the power supply or to locate the singing coil. Good Luck PS please dont forget to rate this thread.

Oct 18, 2006 | Samsung HLM5065W 50" Rear Projection...

1 Answer

Please Help - Set "Dead" Euro 7 vp chassis


This sounds like a line timebase failure. The line timebase works at about 15 thousand cycles per second (15KHz) which may be audible to some people due to the iron-ferrite materials used (magnetostrictive). The line output transformer is highly stressed and also has the rectifier diodes in the outside if the windings. It is all very well insulated to guard against moisture and dust but if it breaks down due to the high voltages (25Kv) the arc produced makes this squealing noise, and of course it burns out, and breaks down. This may not blow the fuse if there is not a short circuit. So get an engineer if you are not sure about changing the line output transformer.

Oct 14, 2006 | Panasonic TX-42PT10 42" TV

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