Question about Sony DAV-C700 System

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Power I am an electronics tech. Unit worked well until grandkids visited..... Fuse on pcb next to input good. All belts on, cd in ready to play position. The thing just has no lights, acts like it has no power. Power connection is good. Are there some interlocks or resets or tricks I can use to get t going again?

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Re: Power

A lot of "aged" problems relate to the power supply with this type of unit. If you are a handy chap and know what capacitors are you will find that finding and replacing the "dry" caps in the power supply will fix most problems including streaky pix and crackly audio.

Posted on Mar 10, 2008

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My onkyo ht-r590 goes on then shuts off right away.

The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately. Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and reconnect an input and a pair of speaker wires onto the unit. If the receiver still does not turn on than you will have to bring it in for service. Turn up the volume and if the receiver doesn't shut down, power off the receiver and add another pair of speakers. Power up the unit again and turn up the volume. If it doesn't shut down, power off the unit again. Now connect all your input sources and turn on your receiver. If the unit shuts down again, your unit will need to be further serviced at an authorized Onkyo service center.

Oct 01, 2014 | Onkyo HT-R590 7.1-Channel 3-D Ready Home...

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Cds will not play in loop. plays one cd and shuts off will not move to the next cd

Troubleshooting Solution

  1. Lift disk changer doesn't work comes message "Disk Error"
  2. Lift disk changer work fine but doesn't load a DVD
  3. Power light is ON but doesn't want to Power UP
  4. From the beginning start DVD movie the picture distorted and freeze

1. Possible Problem w/ Main Board PCB

2. The dive laser assy replace. or full complete 5 Disk changer ROM
3.More chance problem w/ Main Board

4. Problem w/Main board need replace it.

Dec 24, 2012 | LG LHT874 Theater System

1 Answer

How do you get access to the 1.6a fuse

I found this online. I didn't write it, I didn't try it, but it sure sounds good. First off, I had same problem with an old LifeStyle Series 12 and trying to get in to that case is like trying to get in to Fort Knox... I found these answers on a forum.. I wanted to let you know I didn't not discover them myself but it worked for me.. Also my fuse was bad... I am off to the electrical supply house as soon as I finish typing.. Without further ado:

OK Fellas (and Ladies), here's more detail on the blown fuse fix:
1. You can find the 'plastic swivel tab with notches' by looking for gear teeth in the top rear of the unit. To provide some context, I've placed the subwoofer with the serial number side down, horn is up-front and treble/bass dials on the left. Remove the dial knobs.
2. Now place the unit flat with the horn-side down. Literally use a tennis shoe to spank the plastic cover (on the same side as the gear wheel) in a 45 degree upward motion so the RCA plug holes in the plastic cover are dislodged from the jacks and the unit pops off. One good spank does the job *hee hee*.
3. 2 screws will be visible at the top of the green circuit board. Unscrew these and remove cable ribbons that attach circuit board to other pieces of the unit.
4. The fuse is a cylindrical glass piece, 5mmx20mm. Mine was burnt and coils were missing, an obvious sign of a blown fuse.
5. Don't go to radio shack to find a replacement. They are seriously under-equipped to assist. Go online or to a real electrical supply store to get a 3Amp, 250 Volt 5x20mm slowblow fuse. Don't try to call Bose either because this will inevitably result in more pain. They will try to coax you to order an owner's manual for $10 to get the part number, so you can pay an inflated rate to get the same piece from them. Grrr.
6. I saved $200 - thanks to all contributors on the board. Good work.
7. If this advice helps you, do something nice to help a homeless or mistreated animal. Humans can never be too kind to the rest of the creatures on this planet

Holy ****!!

OK, Bose owners out there listen up and listen good. Here's the real scoop on 1.(getting access to the inside of most bose subwoofers, 2.( repairing said subwoofer.

Follow these steps in removing the cover of your subwoofer. Unscrew the two screws from the cover. (They are on the input/output side of the cover) Remove the two knobs (Bass and treble volume). On the opposite side of the cover, (put those damn shoes back in the closet) there is a lockout tab that needs to be swung out, it moves 90 degrees in a counter-clockwise direction and is located under the center of the cover. A small flat blade screwdriver works great for swinging this tab out and will be necessary for the next step (the screwdriver that is). On the same side (opposite the input/output side) there are two small tabs near the edges of the cover, one on the right and it's counterpart on the left. If you look closely in the gap between the cover and the sub itself, you will see these 3/8" wide tabs near the edges and towards the top of the cover. With the flat blade screwdriver, put the blade between the cover and on the tab and pull down. Then with your hand balled into a fist, gently hit that side of the cover towards the input/output side. the cover will move only slightly but the tab should remain depressed. Do the same procedure on the opposite side of the cover and it will slide about a 1/2 to 3/4" towards the input/output side and can then be removed by pulling it straight up and off of the cabinet.

Yay! If you get this far without incident then you are ready to implement repairs. In the case of the AM15's, normally what happens is a resistor will open up and prevent the triac (turn-on device) from firing. The fuse is on the underside of the PC board and this above mentioned resistor is a 100 ohm, surface mount "chip" resistor on the top side of the PC board. It will not appear to be bad but trust me, if the fuse is good and the sub will not turn on... replace it! You don't have to use a chip resistor since as a consumer you may have a rough time finding one but a 1/8 watt or 1/4 watt resistor you can find at any Radio Shack will work just dandy in this application. Cut the leads short and solder the two cut leads to the pads on the circuit board where the chip resistor is currently sitting. The chip resistor will be black, about 1/4" long, 1/8" wide and have "101" printed on it's surface. On some models they used two 200 ohm resistors in parallel but the result is the same. One 1/4w axial lead resistor will do just fine. Plug it up and give it a try. (Before you replace the cover).

Secondly, if the fuse is blown on a "Lifestyle" Bose subwoofer, contrary to popular belief, it blew for a reason. The speaker outputs and the subwoofer output devices are TDA7294 IC's with TIP142 and TIP147 Motorola transistors used as current supplements to these said output devices. If the fuse is blown and replacing it only results in another blown fuse then chances are good that one or more of these are blown. In some cases it's very easy to tell, the front of these IC's will be blown off and/or you will see burn marks on the board where they are mounted. These devices are located inside the amp portion of the subwoofer. (The black metal heatsink underneath the input/preamp PCB. As a consumer, if the fuse is blown, unless you are familiar with soldering techniques and troubleshooting electronics, leave this to the pro's. It isn't as easy as you might think and you can destroy the PCB in your attempts to repair it.

On Lifestyle 25II and Lifestyle 30II systems there is a problem with the surround portion of the sub system. Inside on the surround PCB there is a 400 MHZ crystal that clocks converted (to digital format) audio signals through the surround processing area of the sub. These crystals fail and the system, although it powers up just fine, has no output at all or it is intermittent

Feb 25, 2011 | Bose Lifestyle 12 System

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I bought my first RTD215 2 years ago but the dvd player got stuckand wont open nor play... I bought another unit same model and after 8 months the same thing happened.. the dvd player got stuck again but...

If you really like the unit (disregarding the DVD player issues), maybe you could buy a GOOD stand-alone DVD or BluRay player and be ready for an upgrade in the electronics when the bug bites.

Feb 05, 2011 | RCA RTD215 Theater System

1 Answer

Hdmi input from does not receive signal. Have connected output from cable box directly to TV and signal is there. Unit does not pick up signal. HDMI output from component works fine, as I can play DVDs and...

I have the same issue. I've opened up several tickets with Samsung tech support. I'm concluding that it's the BluRay rcvr has bad hdmi input & output circuitry. I'm returning mine to Best Buy where I purchased it for a replacement. Before I leave the store, I'm going to make sure that the replacement unit's hdmi inputs & outputs work @ the store.

Dec 28, 2010 | Samsung HTTZ522T Theater System

4 Answers

Cd turntable does not turn without jarring the whole unit - therefore, cd's do not play

Sounds like the little motor inside the cd turntable keeps sticking, i have seen electronic motor do that from time to time, it might be worth having a go at pinching the side around the motor to try to loosen it a bit or completly changing it out.

Jan 16, 2010 | Home Theater Systems

1 Answer

Pioneer vsx 3000 plays fine, but the radio function hums

If memory serves correct, the VSX-3000 is from the late 80's. They are good receivers from that era. From your description, it appears the tuner module could have issues, since only the AM/FM has a hum. If all other inputs sound well, it points the the tuner module. These modules are not easy to repair (PCB with SMD highly tuned parts), and are easiest and cheapest to replace. Many VSX models of that vintage use the same part. Not sure how easy it would be to find one. They are a small PCB enclosed mostly in a silver shielding, with one or two connectors from the inside and screwed to the back of the receiver, where the antena connection is.
Good luck

Jul 29, 2009 | Home Theater Systems

1 Answer

Sub won't stay powered up

well if your getting sound out of your surround speakers then the sub is busted, if your getting no sound at all then your speaker input's are either bad or out... i would test the speaker inputs...

Aug 09, 2008 | JVC TH-C30 System

1 Answer

Bose Lifestyle 12 Porblems

sorry mate, looks like cd 5 is damaged goods...... wheter you damaged it or not, can't say....

however, make sure. when you try to play cd, that the cd button, nearest display was pressed as just putting in a cd isn't automatically taking control of the cd function like in other cd players. ( that is to say you have to diliberately select CD mode to play cd's)

if you fancy a load of electronic messing and visits to radio shack i am sure you can repair it if broken,
or a second hand cd unit could be obtained elsewhere on line.

Jan 02, 2008 | Bose Lifestyle 12 System

1 Answer

No sound from my TV!! HELP!!

assume its a bose system 12 (non digital or digital ?)
if you clarify the model of both tv and bose system i will tell you precisely how to connect tv to bose system,

but i must assume first that your cable box is connected to your tv via a scart cable , you must remove sound function from the cable and plug directly into cd5 unit on either auxillary or video input , then turn cd5 unit to that channel to play sound and use bose reomte to control volume (ok)
i would doubt thatthe TV has a audio output, many dont.... also it may be necessary to buy a scart to RCA cable at your local electronics shop or supermarket to completet he task at hand.

if however you are digital.....
make sure you are connectiong bose digital input to a digital (dolby 5.1 compatible) sound source.

sorry if you think i have over simplified the problem !


Dec 02, 2007 | Bose Lifestyle 12 System

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