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Nashville 400 poweramp low freq distoration.All voltages seem correct, replaced all .33 resistors all drivers and output transistors,also replaced the dual diode and small transistors in driver section, comp light comes with even a small signal in.???

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See if the triac mounted at side of chassis is shorted. The triac is an ECG5679.

Posted on Apr 07, 2011

  • bob12077 Apr 07, 2011

    No short to ground on any of the three legs. all voltages are as required.



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Flyback b+ low

Two main reasons. Fly-back transformer [including it H-out transistor] and/or the main power supply section [SMPS] fault. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.

Oct 27, 2014 | Televison & Video

1 Answer

No power out

You have no power because you didn't fix 2 or 3 electrolytic capacitors when you saw warning signs. Warning signs start as horizontal lines every half inch or so. Black bars on the top and bottom, then collapsing to a horizontal line, then complete failure.
You will need a horizontal output transistor, the aforementioned electrolytic capacitors, a voltage rectifier, possibly a high voltage coil called a flyback transformer, wire wound resistor, maybe a low resistance resistor, maybe a high voltage capacitor. In some tvs you need an EPROM ic. I hope you can find someone with the knowledge and expertise these days when the modern throwaway society put almost all electronic repair shops out of business. It may cost about $300 - $400 to get repaired or you can get a modern flat-screen tv for $800 - $1,000 and reinvest that money.

Nov 27, 2013 | Televison & Video

1 Answer

Denon AVR2106 One output channel shorted and blown. 2 power transistors shorted, emitter resistors and base resistors blown Have replaced all, including bias transistor I think bias is still wrong (no...

I would also replace 2sa992 (2pcs) and 2sc1845 on preamp board- sometimes they look ok when you test them by regular meter. Check 1.2 kOm and 4.7ohm resistors at preamp pcb. Check diodes on output pcb (could be smd type, connected from base of output transistors to emitter i think)

Sep 07, 2011 | Denon Audio Players & Recorders

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Speaker blow out with 34vts on output of amplifier .checked transistors & drivers ok.can you help me please

Well, this may take some work, but do you have a schematic for the unnamed mystery amplifier?
If so, trace the voltage back to the op-amp chip that's sitting with V+ on it's output with no input, and you`ve found the problem!
Otherwise, if you have an oscilloscope, with no speakers attached, trace the incoming signal until it turns to a DC voltage or til the signal starts riding on a high or low voltage.

Oh, another thing to check, there's usually a couple high wattage low impedance resistors between the power transistors (unless it's a hybrid chip). If one of those resistors opens up, you can have this issue.

Apr 27, 2011 | Audio Players & Recorders

1 Answer

Screen is red


The red colour output section in your TV has some short in it. This section can be located at the picture tube base card, the printed circuit board along with some components are fitted with it. There will be three cathodes, Red, Green and Blue; usually marked as Kr, Kg and Kb. Take the voltages of these pin points at this board. It should be almost the same. In your TVs case, the voltage at the red cathode will be very low now. Look whether transisotrs or Ic is used for video output section in this side. Usually Sony uses transistors. Check the resistor at the collector of red output transistor. If it is open, replace it. If the resistor is OK and still there is no voltage, and the said resistor heats up abnormally, the transistor related to it is leaky [collertor-to- emitter short]. Replace it with same type and number will solve your problem. OK.

Jan 10, 2011 | Sony FD Trinitron WEGA KV-34HS420 34" TV

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One (right) preamp blow! I've located the problem to the right C160 module. When disconnected everything seems fine. Diodes and transistors are apparantly ok measured onboard as are all resistors and...

transistors are not ok on the C160 module.
replace all the power transistors and emitter resistors for that channel. and are good for transistors

Sep 30, 2010 | NAD C370 2-Channel Amplifier

1 Answer

Onkyo TX-DS838 integra receiver got sound cutting off for few seconds during play back and problem keep incur after few minutes. Any suggestions to trouble shoot this problem very much appreciated. Cheers,

Hello sir, there are several factors that might cause this:
  1. Low voltage. check for filter leaking capactor. defective regulator, or a burnt resistor.
  2. High voltage peak, check for the voltage output VCC.
  3. the main amplifier is defective. if it is an IC amp. replace it. if transistorized check for the pushpull driver/transistor.
Hope this helps. let me know your progress. thanks

Jul 28, 2009 | Audio Players & Recorders

1 Answer

ONKYO M282 AMP seems to have lost all mid and low range

It's probably salvagable but I doubt it will be cheap or easy. Most likely you have one or more ruined output transistors. If you're into taking things apart and soldering, it might be easy for you. Just look
for abnormalities on the transistors, usually a little hole in the center of them or blistering. Replace those and you'll either have it back to sounding good or much closer to it. Most output transistors do not fail without showing visual evidence of it.

Nov 17, 2008 | Onkyo M-282 2-Channel Amplifier

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Screen goes black,with sound

No picture sound ok
Note 1 a Raster is the name for a screen made of lines of brightness
Note 2, A Blank raster has no snow or picture, its just a lit up screen

Sound ok but no raster.
First increase tube's first anode voltage (knob on the loptx) to see if the screen is just too dark.
if after you have turned up the bottom knob on the loptx, there is still no brightness,check, for crt heaters, and EHT 25kv and focus voltage (2kv) and A1's/Screen/G2 voltage is 300-600v.
and check for field timebase (height), the next thing to check is the sandcastle pulse.
If it's present, colour decoder chip is probably faulty or lacks supply from the LT regulators.

NO LINE DRIVE If it's absent,check the line driver, locate the loptr(big and usually has heat sink).
follow the print from the base back to the driver stage , where you will usually find a tiny transformer with 4/5 pins
resolder it, even if it looks good,then with power on, check for voltage on all its pins, 2 should have LT(12v to 32v) or HT (90v to 150v), if not there follow the print back and look for either a transistor(linedrivetr), or the feed voltage line (maybe regulated),
If the voltage is ok on two of the driver transformer(drvtx) legs, the look from the base of the driver transistor to locate the timebase chip
and check round its pins for a 12v supply line, if there ,replace the timebase generator chip

Method of testing line drive, remove line output transistor, and connect a normal red led, across the B/E (longest leg to base), and when you power up the led should lite up.

Trace the pcb back from the BASE leg to find the line driver stage,
Its usually a very small transformer (4/5 legs) and a transistor connected to it,
The driver transformer legs(pins) will be two with voltage and two without
The two with power will either be about HT level (110v=145v) or about LT level(25v)
If not then trace back and look for a biggish 3w resistor.
If the voltages are correct the look for line pulses from the Timebase oscillator chip to the base (some overvolts protection circuits remove pulses if ht is too high).
If the voltage is low and the feed resistor is getting hot then check the base of the driver transistor if its HI over 0.5V then its being turned on by the timebase oscillator chip (protection ?)
If the voltage is zero check the feed resistor
If all seems normal check that 12v is getting to the timebase oscillator chip (IC) (12v regulator?)
Method of testing line drive, remove line output transistor, and connect a normal red led, across the B/E (longest leg to base), and when you power up the led should lite up.

Hope it may help you;

Oct 10, 2008 | Philips 42FD9954 42 in. Plasma HDTV

1 Answer

Jvc tv

You need to check the horizontal output transistor first for a short,ift he transistor is good check the diodes and low value resistors of the secondary of the flyback(output trasformer),if all those are ok check the crt board,it has low value resistor for the g2 voltage,if ok you need to go back to power supply and check for a short from each one of the diodes to ground for a posiblwe short.Be careful when measuring voltages and use the correct ground.

Oct 01, 2006 | JVC AV-36F702 36" TV

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