Question about Onkyo TX-SR702 Receiver

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Won't power up and fuses inside are good. What's wrong? Worth fixing?

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You can get the service manual free online. Just type your model number and the words "service manual".
From what I've seen it has a test mode you could try. There's also a thermal fuse on the transformer, which you might not have seen.
I have the earlier version of this model the 602 and if yours is like mine it certainly is worth fixing. I suspect the only time these things are not worth the money is when the massive chip inside them goes. But I don't think that has gone in your case.

If you have any problems getting the service manual comment below and I will send it you.

Posted on Apr 28, 2015

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Hello, well that sounds a fuse problem, you can try check inside, be shore you unplug the power socket before you do it, if the inside fuse is ok ,so the control board is damage and needs to be replaced, and don't think it worth .
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If you can,check with your multimeter to see if the two voltage rectifiers are good.If they are OK,you may need to replace the 2 audio amplifiers.This will require proper tools and good experience.

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I have a toshiba 42RV530U and it won't turn on, no yellow or green light. what can be wrong. There is power going inn.


I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.5_5_2012_5_14_18_pm.jpg

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1 Answer

Power won't come on?


Since no model number indicated a general answer:

I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.4_4_2012_7_19_38_pm.jpg

Bad caps that are puffed up on top- look in you power supply inside the set to see if you have this common issue.

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1 Answer

NEED AN ORDERS MANUAL FOR 2003 FORD WINDSTAR


open the cover door and you will found some wrong here and not really work good '

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1 Answer

The battery tested good but i have no power to anything inside the car


You most likely have a bad battery cable or cable connection. Depending on what kind of car you have (you didn't say) you could also have burned fusible links and/or blown fuses. I would check the battery cables FIRST. All connections need to be CLEAN and TIGHT.

Also please review these articles:

My Car Won't Turn Over

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Where's The Fuse?

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1 Answer

1994 zenith no power light how to fix


Most often, a fuse on the set mainboard has blown. You need to be very careful because there can be allot of stored energy in a CRT type television....on the order of tens of thousands of volts. The fuse will be inside near the power input.

My advice is to not open up the TV unless you are experienced. The voltages inside can kill or seriously injure.

The bad news is that this fuse ususlly blows when the sets "flyback" transformer goes bad. This is not a simple item to replace and you should take the set to a good repair shop and get an estimate to see if the set is worth fixing.

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1 Answer

Microwave just stopped working one minute working one minute no power no display (about 20 years old) can we troubleshoot and repair ourselves?


sounds like fuse may have blown..if light doesnt come on inside then that is possibly what is wrong..the fuse is inside the case and u have to take the outside off to get at it...make sure the power cord isnt plugged into the wall and do not touch anything else inside the unit ..there is a big capacitor inside that can give a very very bad shock....or the logic board is not good..if that is the case then it is not worth repairing

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1 Answer

Will not turn on.


If the TV is blowing the fuse in your house, It looks like a component in the power supply is shorted.
To fix the TV, you will need to buy a new power supply module or get the one inside the TV fixed.
Good Luck.

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