Sonicview SV8000HD - Power supply problems? EASY Fix
C/P .. credit: psilocybin
i would like to point out a few things i as an electronics tech have came across with others trying to repair their psu's...
first of all, a leaky cap is most likely the problem when it comes to not being able to power on your sonicview 8000...this can easily be determined by using a DMM...you need to set it to ohms..
You can use your multimeter as an ohmmeter to test the capacitor.
i suggest doing a bit of reading or practicing on soldering/desoldering befor attempting this, if you have no prior experience...grab an old psu take er apart and practice desoldering/soldering...theres a few ways to desolder, i suggest the solder sucker for such circuitry such as a psu (theres also solder wick which works great to)..when you start dealing with motherboards, and smt (surface mount technology) its a total different story (your mother board), but you dont have to worry about that. i made a small tutorial of soldering/desoldering at the end of this post.
1) Discharge the capacitor by shorting out its leads. That is - use a wire and connect the leads of the capacitor together. This will discharge it.
2) put your multimeter in the high ranges 10K-1M
3)CONNECT MULTIMETER TO CAPACITOR LEADS(OBSERVE THE POLARITY IF ELECTROLYTIC). AS SOON AS THE LEADS MAKE CONTACT, THE METER WILL SWING NEAR ZERO. IT WILL THEN MOVE SLOWLY TOWARD INFINITY. FINALLY THE METER WOULD COME TO BE INFINITE OHMS BECAUSE THE CAPACITOR IS BEING CHARGED BY THE BATTERY OF THE MULTIMETER.
4) IF THE CAPACITOR IS BAD, IT WILL GO TO ZERO OHMS AND REMAIN THERE. THIS IS CALLED A SHORTENED CAPACITOR, IF IT IS LEAKING, THE CHARGE WILL STOP AT A VOLTAGE (EG..1.2V) AND WILL NOT CONTINUE TO RISE.
5) IN THE CASE OF AN OPEN CAPACITOR THERE WILL BE NO OHMMETER INDICATION.
6)SOME CAPACITORS HAVE A LOW DIELECTRIC LEAKAGE. YOU WILL KNOW THIS IF THE OHMMETER COMES TO REST AT A POINT LOWER THAN INFINITE. TEST A KNOWN GOOD CAPACITOR OF THE SAME TYPE TO BE SURE
in these cases replace the caps...the common cap to replace is C10 on the power supply board..if that doesnt help continue your inspection with the DMM and change any caps that cause a problem.
i myself have repaired many sonicview stb's using the above instructions that i shared with everyone and have not had a single problem i was unable to fix
******************desoldering and soldering********************* ****
first to desolder
you just need to heat up the solder with the iron...grab your solder sucker (yes thats what its called, its like a surrenge with springs), while still holding the soldering iron to the solder-make sure its in liquid form, release the solder sucker and it should suck all the solder up...if it doesnt than repeat...once you have all the solder off of the leads the cap can easily be removed with a pair of needle nose pliers.
How to solder!
next grab your new cap -make sure polarity is correct!!!!!!!, place your new cap in the 2 small holes, and take your solder and place it up against a lead to the cap, use your soldering iron to heat up that lead and the solder should just melt to the lead and proceed to fall to the circuit board leaving you with a nice small mound of solder connecting the lead to the circuit board. repeat for the other leads.( dont use to much solder, you just need a tiny bit, if to much is used you could short a bunch of components) .next take a pair of side cutters and snip off the leads at the solder point so they dont short anything out.
Please don't PM me with fta related questions, they will no longer be answered.