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January 1, 2009 08:09 PM

Categories: Home Theater

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Joined: 01/01/2009


2009 began with a challenge for me. My JVC surround sound system stopped working. The unit will not power on and the standby indicator is off. I checked the fuse and that's good. So now I'm stuck because I don't have the service manual to check further. This appears to be a problem with the standby power supply.

If anyone has a manual that i can use  that would be helpful, or if anyone can share some advise with troubleshooting this, I would greatly appreciate it. 

Hopefully someday I can contribute something of value to this community.

Thanks in advance.

Discussion:    Add a Comment | Comments 1-19 of 19 | Latest Comment

August 7, 2009 9:57 PM

I have the same problem! Did you ever get any results or get it working?

thank you for your help


August 7, 2009 10:09 PM

read another post and it talked about the slow blow fuse. Will get one and see what happens!

September 2, 2009 9:16 AM

Still not fixed. I got the schematics, and been troubleshooting off and on. I think its the IC voltage regulator but not 100% positive. I'm getting some voltage reading not corresponding to the schematic. I cannot have the power on and have access to the pin to take readings. Anyway the replacement partcost $30, but i dont want to buy it and to find out it something else that's faulty. If you's like I could send you a copy of the schematic.

September 2, 2009 10:59 AM

I ended up replacing the fuse but it did not fix the problem. I also looked at the board located close to the bottom of the machine. I had power after the fuse and to a few components but then the power dropped off. The parts to replace the components are costly as you mentioned. I decided it is better to buy a new audio system and a seperate dvd player. I am now a firm believer in buying seperate devices so that I do not lose all devices if something goes bad. I lost my radio and my DVD player all at once. Thank you for your help.

October 4, 2009 12:27 PM

Hello, have a similar problem, replacing the slow-blow fuse did not correct it, I was wondering if you could send me those Schematics? I'd really appreciate it.

Email - ensef@sonicaberration.com


December 16, 2009 4:25 PM

have the same problem is it the standby power supply? If so where can I buy one

December 18, 2009 7:23 AM

I didn't bother to repair the unit, I think it is the IC voltage regulator that's the problem but not 100% sure. I looked at the price and it cost about $30. I didn't want to spend $30 on a part and not fix the problem. I have the schematics if you'd like I can share it to you.

April 8, 2010 1:34 PM

for the no power problem, check for popped capacitors. This has been a common problem on the JVC TH-C50. This will be a 1000uf/10v capacitor located on the main board of the receiver unit. The part number is QEZ0654-108Z. The symbol number on the board is C975. You should see the top of the capacitor raised up just a little and rounded off. It's not a tough repair, but, it does include removing the old capacito and soldering in the new one onto the board. Cheap fix to do it yourself, 10-15 dollars if you already have a soldering and de-soldering iron.

October 25, 2010 11:38 AM

Hi smgoins
Thank you for the suggestion, you hit it right on the money that was the exact problem... and fixed it for the cost of purchasing the service manual. I already had a soldering iron and had some spare parts, which included that 1000uf/10v capacitor.

I really appreciated your help....

View unverified member's comment - posted by gss986

February 9, 2011 11:30 AM

SMGOINS, thank you!! I found this thread after the ceramic fuse one(having ordered from JVC and it did nothing). I went to Radio Shack and had the guy get me an equivalent that is actually a 1000uf/35v had an electrician capable friend solder the new capacitor and it fired right up! $3 fix. So happy right now. Techlore is awesome.

April 16, 2011 9:02 PM

I just got the capacitor mentioned above...but i wasnt paying attention when i took the old one out, now i do not know which way to put the new capacitor in, Any advice?

May 2, 2011 12:42 AM

Does anyone have a copy of the schematic that I can take a look at? Mine has no power and the fuse is good. I think mine might need a power supply IC, but I have no way of knowing without a diagram. The capacitor mentioned above seems to be OK, too.

February 2, 2012 10:44 AM

i dont mean to be a bit slw here but where abouts on the board is the part C975 as can not find it

thank you

January 12, 2013 8:20 PM updated: January 12, 2013 8:21 PM

I first tried the slow blow fuse mentioned earlier from Radio Shack and the receiver didn't turn on. I saw someone else say to replace the capacitor (1000uf/10v). Radio Shack had the 1000uf/35v as another person said. I desoldered the capacitor that was rounded off at 975 and soldered in the new one....

The TH-C50 lit back up and works like the day I took it out of the box 5 years ago!!!!!!!

1. A four pack of slow blow fuses $3.80
2. A 1000uf/35v capacitor $1.20

Total spent = $5.00 You can't beat that!

View unverified member's comment - posted by Jimbohuf

August 25, 2013 10:43 PM

Sorry for updating an old thread.. BUT...

I am facing the same issue as mentioned here. So I opened my subwoofer to change the capacitor and no 1000uF capacitor at all.. There are four 4700uF capacitors...

What do I do now?

August 25, 2013 10:50 PM

Yes-I said: Hi smgoins Thank you for the suggestion, you hit it right on the money that was the exact problem... and fixed it for the cost of purchasing the service manual. I already had a soldering iron and had some spare parts, which included that 1000uf/10v capacitor. I really appreciated your help....

Hey "YEs-I". Did you repalce the capacitor inside the subwoofer? In mine, theres no 1000uF capacitor at all... Only 4700uF capacitors !! 

February 21, 2014 6:53 PM

so i had just replaced the 1000uf/10v and put everything back together and it works like brand new well now im having the same problem with the subwoofer i plug it in and stanby light will not turn on and fan in back wont turn either so if someone tell me what i should now would be great

Discussion:    Add a Comment | Back to Top | Comments 1-19 of 19 | Latest Comment

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