how to replace capacitors on power supply board.fix no power/stuck on booting

[arboristman]

how to replace capacitors on power supply board.fix no power/stuck on booting.and the best part,it costs under $4.00!

do you have sonicview hd8000 that shows no power at all (appears completely dead) or is stuck on booting,and you tried everything possible but cannot restore the receiver to the ON condition again?


you can fix it yourself and save shipping charges,and or $ on a new power supply board.
this requires soldering.
you can try replacing two capacitors,#C10 and #C24 on the power supply board.C10 is often the culprit.but its also recommended to replace C24 while your at it.on the power supply board they are labeled.
your going to replace the older lower voltage rated caps with higher rated ones.based on my research the voltage is not that important.the only requirement is that the voltage must be equal to, or greater than the ones you replace.
make sure you observe the polarity of the caps.
iv also read that the bad caps may not necessarily appear bad,but in fact may very well be.so don't go on appearance alone.
iv also gathered the part number and info on the capacitor you can use that many have reported successful results using:

image,and part #'s courtesy of: "mola" of a different forum and his descriptions:

capacitor info
1000uf 35v capacitor
Radio Shack Part # 272-1032
35W VDC Max
Operating Temp -40 to +85C
Tolerance +/- 20%
Lead Spacing 5.0 mm


Bottom of the photo is the front
The top of the photo is the back

Left side is before the repair
Right side is after the repair





this thread will remain open for discussions and help.
share your tips too please.
good luck!

[fossil112]

We need to mention how to properly handle any potentially charged capacitors prior to messing with them. A 1000uF cap will give you pretty good shock if it's charged.

The safest way to discharge a capacitor is by physically shorting the cap to ground. To do this, you need a piece of wire with very good insulation and a pair of insulated gloves (like clean yellow kitchen gloves, or thicker). Clamp a wire to a metal surface (preferably one that's grounded) then touch the other end of the wire to the negative terminal of the capacitor. If it's charged, you'll see/hear a spark. The capacitor is successfully discharged. If nothing happens, be sure you're on the negative terminal (the cap may also have lost it's charge all together, so no spark will occur). The capacitor is safe to remove and replace.

Discharging should be repeated to all capacitors in the working area of the circuit board. This is in order to create the safest working environment while protecting yourself. The last thing you wanna do is touch a charged capacitor with the end of a soldering/desoldering iron.

[RagingBull]

Also being an Electronic Tech myself I recommend to bring your box to someone like myself who is familiar with Electronic Repair. When I used to do home electronics repair as a moonlighting job for extra cash I saw quite a few instances where people turned a $15 dollar job into a $150 job because they tried to do it themselves with little skill or knowledge.

I can't tell you how many times I saw VCRs with tapes stuck in them because of a $2 broken belt. A quick and inexpensive repair for someone with some knowledge of how to do it properly however most of them were no longer worth repairing after the owner attempted to fix it himself.

If you have no de-soldering experience yourself I recommend you take the box to someone that does.

[arboristman]

Originally Posted by eclipsemoon

now i did read one of arbors post on replacing capacitors on power supply but i do not know how to solder.

but a little later:

Originally Posted by eclipsemoon

OK everyone i am BACK UP. Thanks for all the help and advice. i ran to radio shack and replaced capacitor c10 and c24 on the power supply. i followed ARBORS instructions to the t. it cost $3.19. now that is cheap. it was so easy to do.i will post the link here so if anyone has the same problem they could refer back to this post. i would like thank again everyone who responded to this post and of course my friend arbor. Take Care Everyone. ps: it only took 10 minutes to remove and re solder both capacitors.

Originally Posted by RUKrazy

Box was dead, no lights on the front, no USB. I read the
"how to replace capacitors on power supply board.fix no power/stuck on booting " sticky and decided to give it a try.
3 hours later I'm watching TV!
Thanks to Arboristman for the great post.

when asked to rank how easy/difficult it was on a scale of 1-10 (10 being the most difficult) RUKrazy responded with this comment:

Originally Posted by RUKrazy

I would rank it as a 1. It was very easy to do.
I already had all the tools needed to do the job, but if someone didn't, they could get them at Radio shack for about 30 bucks total.
Soldering iron.
Desoldering tool.
Solder chisel/brush.
Solder.
Unfortunately they don't sell soldering experience at Radio shack, but just grab any old electronic board and practice on that.

now here's something else to consider.
1.warranty.if your under warranty still,you can simply send it in for repair.
2.if your out of warranty,and not sure you want to do this,OR if you decide the tools required are about equal to the new board cost,you may just want to order a new board.you can contact sonicviewusa and order a power supply board for about $30 (at time of post) ask about shipping charges as well of course.so that's a pretty inexpensive solution as well for many.just so you guys know.
it appears to very easy to do for even the novice or advanced though.
and i suppose what are you out if you mess up the board? just the cost of the caps lol.cus if your doing this anyway,you need a repaired board or a new one anyway.so don't be afraid to brake something thats already broke.

[eclipsemoon]

Well i just did this to my sonicview 8000 and now it is alive again. replaced both capacitors. Thanks everyone for the advice.

[RagingBull]

Amazing to see. I have seen trained techs almost destroy boards with improper soldering technique. Too much heat, too long on the joint, too much pressure etc but if you can get the board for $30 and the thing is dead anyway, why not. Good advice by the novice though. Get some scrap boards first and practice. When you are satisfied you have it right try the real thing.

[cdo_care]

This thread is very useful.My Friend SV8000 have this issue, then i follow the procedure step by step and she is alive now..At first when we turn ON after we Fix.The Display panel didn't turn ON the light. Then we wait about 30min.Then Boom the light pop-up and have TV. Thanks Smod Arb. for the Thread.

[RagingBull]

Originally Posted by cdo_care

This thread is very useful.My Friend SV8000 have this issue, then i follow the procedure step by step and she is alive now..At first when we turn ON after the we Fix.The Display panel didn't turn ON the light. Then we wait about 30min.Then Boom the light pop-up and have TV. Thanks Smod Arb. for the Thread.

Hmm light did not come on for 30 min eh? I would check the soldering for a cold joint. Sounds like you did not have connection until the heat of the power supply caused the joint to make. If so your problem is bound to come back.

[eclipsemoon]

another quick question, i did not realize there was a positive and a negative on the capacitors, should i look? and how will i know witch way it goes? the receiver is working fine, i was just wondering is it going to be ok that way?

[RUKrazy]

The capacitors have a wide gray band with a negative sign on one side that lines up with one of the wires on the capacitor. This is the negative side. The old ones and the new ones are both marked this way. Make sure the new one is connected the same as the old one. I don't think it would work if it was reversed.

[RUKrazy]

It will be interesting to see if the modified boards out last the originals. Mine was 18 months old when I had to replace the capacitors.

[RagingBull]

Originally Posted by eclipsemoon

another quick question, i did not realize there was a positive and a negative on the capacitors, should i look? and how will i know witch way it goes? the receiver is working fine, i was just wondering is it going to be ok that way?

You can tell the polarity as RU suggests. The negative end is usually marked. In case you don't know which way the original went, sometimes the board is marked also but sometimes it is not. It is very important to connect them with the correct polarity. They can burst or in some cases explode if they are hooked up backwards. Chances are they are correct if the unit still works but I would check them for safety sakes.

[RagingBull]

Since some people seem to want to attempt this on their own I am including a link to a soldering video which will show you proper technique. Just be sure NOT to use acid core flux. That will corrode the tracks on the board. You should ideally use 63/37 Rosin Core solder and Rosin Flux. If you cannot find 63/37 then 60/40 solder will do, its just not quite as good.

In the link below just replace the xx with tt.

hxxp://www.wonderhowto.com/how-to/video/how-to-solder-electronics-the-right-way-253645/

Hopefully the mods will allow this link as it will be helpful to most that want to attempt this repair.

[fatham]

Originally Posted by arboristman

how to replace capacitors on power supply board.fix no power/stuck on booting.and the best part,it costs under $4.00!

do you have sonicview hd8000 that shows no power at all (appears completely dead) or is stuck on booting,and you tried everything possible but cannot restore the receiver to the ON condition again?


you can fix it yourself and save shipping charges,and or $ on a new power supply board.
this requires soldering.
you can try replacing two capacitors,#C10 and #C24 on the power supply board.C10 is often the culprit.but its also recommended to replace C24 while your at it.on the power supply board they are labeled.
your going to replace the older lower voltage rated caps with higher rated ones.based on my research the voltage is not that important.the only requirement is that the voltage must be equal to, or greater than the ones you replace.
make sure you observe the polarity of the caps.
iv also read that the bad caps may not necessarily appear bad,but in fact may very well be.so don't go on appearance alone.
iv also gathered the part number and info on the capacitor you can use that many have reported successful results using:

image,and part #'s courtesy of: "mola" of a different forum and his descriptions:

capacitor info
1000uf 35v capacitor
Radio Shack Part # 272-1032
35W VDC Max
Operating Temp -40 to +85C
Tolerance +/- 20%
Lead Spacing 5.0 mm


Bottom of the photo is the front
The top of the photo is the back

Left side is before the repair
Right side is after the repair





this thread will remain open for discussions and help.
share your tips too please.
good luck!

Hello;
I seem to have the same type of problem ie no display, fan and 2 green lights on board only working.
I have tried to use the rs232 serial cable, to reinstall the firmware using the "Channelmaster" loader provided on Sonicview's website. There was no indication of any connection between my PC and the receiver.....So I was wondering if the problem could be the power supply.

I have checked all the voltages on the power supply board at J7 cable socket. The voltages I got were very close to what is printed on the board beside the pins. The only ones that showed a significant amount of difference was the 2 pins that say 3v3 which I believe means 3.3 volts. My digital voltmeter shows 2.7 volts on both.
I don't mind installing the caps if that is required, but I am not sure if that voltage drop is enough to cause the problem.

My question is: Has anyone else checked, to see what their voltages are, or were on the power supply output pins. Either when it was working and or before the caps were replaced.

Any help will be appreciated.......... Cheers fatham

[RUKrazy]

I don't think you can determine if a capacitor is bad by testing the voltage output of the board. Just google "testing capacitor" and you will find instructions on how to isolate and test capacitors and the equipment required.
I did not test my capacitors, I just replaced them and my box works now.

[mookapyro]

so excited about this...I will be trying soon, when I'm done, I will post results. Thanks

[RagingBull]

Just a note to say that the #1 main reason Electrolytic Capacitors go bad is excessive heat. It dries up the electrolyte in the capacitor so keeping the box cool will extend their life. The #2 reason is design flaw meaning the voltage rating selected for the capacitor was too small.

The rule of thumb for design is to have the voltage rating of the capacitor 2 times the DC voltage in the circuit. Due to cost cutting however many companies try to get away with lower voltage capacitors since they are cheaper. The result however is they fail earlier than they should.

I am not sure which is the case here since I do not own this receiver but making sure your box has adequate ventilation is always a good idea.

[Providian623]

I just completed the cap mod on my very, very, dead SV8000.

It's alive!

It's alive!

Now to replace the fan............

You guys (and gals) are the greatest!

[fatham]

Originally Posted by fatham

Hello;
I seem to have the same type of problem ie no display, fan and 2 green lights on board only working.
I have tried to use the rs232 serial cable, to reinstall the firmware using the "Channelmaster" loader provided on Sonicview's website. There was no indication of any connection between my PC and the receiver.....So I was wondering if the problem could be the power supply.

I have checked all the voltages on the power supply board at J7 cable socket. The voltages I got were very close to what is printed on the board beside the pins. The only ones that showed a significant amount of difference was the 2 pins that say 3v3 which I believe means 3.3 volts. My digital voltmeter shows 2.7 volts on both.
I don't mind installing the caps if that is required, but I am not sure if that voltage drop is enough to cause the problem.

My question is: Has anyone else checked, to see what their voltages are, or were on the power supply output pins. Either when it was working and or before the caps were replaced.

Any help will be appreciated.......... Cheers fatham

HELLO........ Just to add to this update. I replaced the C10 cap on the power supply board. This allowed the unit to bootup and "power on".
I then rechecked my voltages again on the J7 plug from PS. to MB.
The 3v3 (3.3 volts) pins, that I had mentioned in my previous post, which had shown 2.7 volts, NOW show 3.3 volts (3v3).
So to make it simple....if you check all the voltages on J7 and they all test out close to what is printed on the board, except the 3v3 pins then you definitely know that your C10 is shot. The fact that the voltage was only 0.6 volts below operating voltage is still a high % drop.
I had to do a factory reset when I connected everything back up since my receiver display on the tv came up in some weird language and I could not read most of the menu's.

ALL is GOOD now......Thanks for those that provided help and I hope my info may help others. I emailed Sonicview, twice and gave them all kinds of info, they responded quickly, but only gave generic answers, that where totally of no value. They asked me to phone them in the end, but I fixed it myself.

Cheers.....fatham

[RagingBull]

Originally Posted by fatham

HELLO........ Just to add to this update. I replaced the C10 cap on the power supply board. This allowed the unit to bootup and "power on".
I then rechecked my voltages again on the J7 plug from PS. to MB.
The 3v3 (3.3 volts) pins, that I had mentioned in my previous post, which had shown 2.7 volts, NOW show 3.3 volts (3v3).
So to make it simple....if you check all the voltages on J7 and they all test out close to what is printed on the board, except the 3v3 pins then you definitely know that your C10 is shot. The fact that the voltage was only 0.6 volts below operating voltage is still a high % drop.
I had to do a factory reset when I connected everything back up since my receiver display on the tv came up in some weird language and I could not read most of the menu's.

ALL is GOOD now......Thanks for those that provided help and I hope my info may help others. I emailed Sonicview, twice and gave them all kinds of info, they responded quickly, but only gave generic answers, that where totally of no value. They asked me to phone them in the end, but I fixed it myself.

Cheers.....fatham

Great Job Fathom, I am sure this will help others with the same problem.