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AV-D77 power issues

Welcomejee,

Thank you for offering to assist. I do have the D77 prints and schematics. Is it in the power circuit board? If you can help, it would be much appreciated.

Thanks,

Clue

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Please let me know symptoms of AV-D77 receiver.

Posted on Nov 18, 2008

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1 Answer

My onkyo HT RC330 will not power up at all. Have had problems past couple of months with starting it but if you played around with swith it would start. Now nothing.


Try resetting the AV receiver To reset the AV receiver to its factory defaults, turn it on and, while holding down VCR/DVR, press 8 ON/STANDBY. "Clear" will appear on the display and the AV receiver will enter Standby mode.

It is possible that the protection circuitry has been activated. Remove the power cord from the wall.. Disconnect all speaker cables and input sources, and then leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect only the power cord and set the volume to maximum. If the AV receiver stays on, set then the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your dealer.

If the standby light is lit it and the unit will not boot it is most likely that the protection circuit has been activated. If there is no standby light then check the fuses. These units check that the power supplies are operating near specification. If a capacitor or resistor in the circuit, or a broken solder connection the unit will shut down. Because of the temperature the thermal cycling around the power supplies a broken solder joint can occur. This will make for an intermittent operation.

Hope this helps.
26289825-owoa52fq3dbvw0lom3ojbzgr-3-0.jpg Failed resistor or capacitor


26289825-owoa52fq3dbvw0lom3ojbzgr-3-2.jpg

26289825-owoa52fq3dbvw0lom3ojbzgr-3-5.jpg

Sep 23, 2016 | Onkyo Ht-rc330 5.1-channel Home Theater...

1 Answer

I have an LG 55lm4700 that has no power led and no picture, wondering what might be the issue.


it sounds like a blown capacitor in the unit somewhere.
here are some tools you are going to have to have: ohm meter,oscilloscope, signal generator, soldering equipment,
grounding equipment, diagrams, schematics, test points, layout of circuits,

Sep 18, 2015 | LG 55-Inch LED LCD TV - 55LM4700 Cinema 3D...

2 Answers

The unit won"t power up


Please check the power supply to the unit, if the fuse or the main power is faultty. Now if the set has tripped then this can be a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 06, 2011 | Coby Home Theater Systems

1 Answer

Need the schematic for RCA model RTD315-A


Very smart, right? You send my an e-mail asking if I need assistance to solve my problem but offering a "premium assitance plan" wich means "fee" and on the top of it in case if I already fix my problem you ask me how I did it, that way if somebody else have the same issue you take "my advice" and charge for that. I don't think this is any fear. To who ever read this post be aware of this scamers.

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1 Answer

Philips mx5700d.Power goes in but no power from first circuit board.How can i get this repaired or could i buy a new circuit board.BigRons1


I bought a second hand one of ebay which was also faulty in another area and took the part out that i needed and replaced.A lot cheaper doing it this way then buying a new circuit board.Thank-you for your intrest.Ron.

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loose connection of the printed circuit board.

Dec 22, 2008 | Samsung HT-WX70 Theater System

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Aiwa AV-D77 receiver power issues


Please confirm 9 volts on Power Board as shown in below picture...

2d907aa.jpg
Regarding click-click-click sound of relay its caused by Serial Clock and Serial Data signal failure in digital ICs. Please confirm above signals by using Oscilloscope.

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1 Answer

DAV DZ100


Please check your previous post for reply.
I couldn't find a way to reset player in this situation.
Thank you.

Oct 26, 2008 | Sony DAV-DZ100 System

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Need A Circuit Board


I would say that it might be hard to find those service parts as an entire assembly that is why I suggested to fix it to the component level.
Even finding and buying the assembly might not be economical depending on the price of your device.

Jul 27, 2008 | RCA RTD258 System

3 Answers

System won't power up


Hi,

Based on your description, we can limit the fault to the power supply board and in particular to possibly 3~4 components:
  • bridge diode;
  • filter capacitor (mains);
  • regulator;
  • filter capacitor (secondary).
blown fuse indicate a short in any of these.

As Jaime867 has suggested, in the absence of a readily available replacement board, component level might be the best alternative at the moment. Having posted the most likely culprits further narrows down your troubleshooting. Could you pls post back the part number of the smaller IC either 4 or 8 pins?

Alternately, pls check for the presence of a VDR, it would look like a coin (often green in color or something else) with 2 pins. They have been known to short out also and cause fuse to blow. One possible indicator is chipped or flaked of one side or a hairline crack on top. If it is chip, there would be a silvery color on the inside.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 26, 2008 | RCA RTD258 System

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