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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  • Anonymous Jul 13, 2008

    No lights, won't work. Power button light comes on but no other lights. It's happened 4 times. The first 3 times I turned the unit upsidedown and the next time I tried it, it worked. This time still out!



    I've unplugged it, left it off over night, tried all I can think of. Never know what causes it to go off, or back on.

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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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Posted on Jan 02, 2017

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My refrigerator has a lock out. If I press the lock for 5 seconds and unit locks out dispenser capabilities. I use is when grandkids get here so they don't play with it and spread ice and water everywhere. To unlock, simply I press another 5 seconds and I can get ice and water again. Check your lock to see if someone has inadvertantly locked it out.
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put a song onto play using either tape, vinyl, cd or mp3.

once playing follow the wires from the speaker that doesn't work bending it until you hear it crack or become clear if it does either of those it is the wire between the head unit and the output.

if not you can try attaching the speakers to a different head unit if it doenst work it could be the driver (the cone doesn't have to go to blow a speaker)

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My Directv H21-200 will not power on. Even after leaving it unplugged for a while. I need to know if there is a fix or if it's fried.


Take the unit aparts,the power fuse at near the a/c power supply cord.Check for the power fuse.If the power fuse it is dead,replaced it,u have a 70%-80% the unit will work again.If the unit power fuse it is good.Than the unit it is fried,it could be anythings are dead on the unit PCB board,now u must have great electronic skills and troubleshooting skills to find out where it is and replaced it electronic parts on the unit PCB board.Require alot of skills at this points.Not worth the effort.It time to buy a new one.

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Why doesn't unit power up when power button is pushed? Checked outlet and is plugged in.


Take the cover off the unit to look at the fuse...it looks like a little glass tube and will be near the power cord input....you should see a little wire element inside that must be all the way across the tube, otherwise it is bad and will need to be replaced....these fuses are available from places like Radio Shack....If the fuse is good then there is probably a problem in the power supply circuit that will need to be troubleshooted by a service tech

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I have a Alpine CDA 7892 CD head unit I just installed and the radio works perfect but when I play a cd it sounds very muffled and I can hear bass only. Is the unit bad?


If the sound is coming out clearly with the radio on, then there is a problem with the cd drive or its connections. If your stereo has aux. inputs, you could run an mp3 player until your ready to replace it.

If you need further help, reach me via phone at https://www.6ya.com/expert/david_f2436a37cbb50365

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1 Answer

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The clicking noise that you are hearing is actually the power relay. Normal operation by either the remote or the power button on the front panel, you would normally hear a soft click just after the press of the power buttons to turn the unit on or off. When you initially plug the unit in to power, you will hear the same click noise. Being that you are hearing it all the time indicates a failed relay. TV's now a days, or at least ones built during the last 15 - 20 years have different Printed Circuit Boards (PCB). There are PCB's for power (which youre dealing with now), sound,video and so on. The PCB that you need to repair your clicking issue will run you about 80 U.S. dollars for the part plus the average going rate for repair from a qualified service tech. You could purchase the part from Thompson Consumer Products repair and fix it yourself, but be aware, there will be no warranty on the part itself unless an authorized tech does the work. Located on this PCB is the power on/off relay, fuse, usually 4-5 connectors for power to different PCB's (depending on model and features). Now depending on how old the TV actually is, you may want to invest in a newr set, the reason why I say that is, is because the new power unit may and can overload the other boards and cause damage to them and now you have a new problem to deal with( along with more money being tossed down a hole.

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3 Answers

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1 Answer

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Hi ,The 9105 PTU Takes the ships mains from the PCT 9106 PCB make sure you have the supply form the PCT board ready which is a protection circuit ,should you have an overload from the modulator pcb then the pct board shall inhibit the supply to the ptu 9105 ,so here is what you have to do ,disconnect the HV 330 volt going to the modulator pcb and then switch supply on ,ensure your fuses are all fine .fond regardsfiroz.kamarudin@gmail.com

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