Thank you Lex, your post were very informing and helped me alot!

My S750 broke 3 days ago.

Standby won't turn on.

Green LED flickerin.

Two years ago this happend the first time. But I left the S750 alone without power for a month in my cold apartment.
After it warmed up and had power for several hours it turned back on again.

This only happend 3 times in the last two years.


But this time, it was warm and the S750 had power, it even was in standby but when I pressed the power button on the controller it broke down, the LED began to flicker and nothing happened.

I searched the internet for tutorials and help.
This posts were the best I found.
I never had anything to do with electronics.
I studied biochemistry and computer science so I am not total new to this, but I never learned electrical engineering.

First I learned how to read the circuit diagram.

Then I learned how the different components work.

I disassembled the entire unit and took a good look.

Then I started cleaning everything, and removing the old glue.
It was all over the place.

I started with the big capacitors, desoldering and measure resistance and capacity.
But although my S750 is almost 10 years old, all seems to be fine, no visual damage or any bulging capacitors.

Next I tried a cold heat method i read about. In order to find the numb capacitor.
In my case it is C62, it was hidden underneath a shrinking tube (why??). First I though it has to be light proof, but it's just a normal capacitor.

When I cool this one down, the LED keeps flickering, but if I heat it over 35°C it starts
As chemist I know reaction speed doubles each 10°C (10 K)


I just order almost any capacitor on the board, but higher quality, Panasonic, Nichicon and Würth Elektronik (a german brand) from Conrad.de a german electronics shop, for around 40€.

They should arrive tomorrow, then I will start replacing everything and start testing

When it's done, I will write a short summary with pictures.

This is how it started.

http://imgur.com/wEm8U0m

http://imgur.com/ImVWDHM

Finding the numb cap.

http://imgur.com/snHfytg

Trying to power it up with all connected

http://imgur.com/I0kisJi

It worked

Start of desoldering

http://imgur.com/IhPOxHL

http://imgur.com/dMb37Fg

Already removed a lot of old glue

http://imgur.com/Je0hdTJ

http://imgur.com/EKDVh2j

These caps I removed today, new will come tomorrow
If it works, I might change all caps but right now I am too lazy

http://imgur.com/HiixKFl

Most look still good

http://imgur.com/jFUQP8b

http://imgur.com/bvlm48J

The big 470 µF 200 V were at ~430 µF but I think this is still fine, one of them lost his "hat" ^^
The small one on the left looks good but I know that it's dumb : /

My quick sketch

http://imgur.com/56LVVrH


All images will stay in my One Drive
https://onedrive.live.com/redir?resid=D0D96...nt=folder%2cpdf

I removed all old capacitors and cleaned of the old solder
I tried to remove more old glue, but I am pretty sure I already removed it from places that could cause shorts

http://imgur.com/SiORYIC

http://imgur.com/HLXf24E

And in these pictures you can see the new caps
Except those 2 330 µF 100V the new ones didn't arrive
But they are very easy accessible from the outside, so I put everything back together and tested its function

http://imgur.com/EDf7JIg

http://imgur.com/ekhqsAl

http://imgur.com/rNnoIlI

http://imgur.com/f52QSFF

http://imgur.com/9YYm8NL

These 4 470 µF 200V are a little high
40mm old were 35 mm but there is still some headroom left
New ones are Nichicon VY
And like all I choose 105°C

Works great now
Starts immediately and no problems
I think those 2 330 µF 100V will arrive at Monday

http://imgur.com/xlRVUoq

I am very glad that everything went out this well, it took me 5 days to learn what was going on and what to do
On Monday it will be an entire week after first total fail until repair
In the best case I will be able to use this system for another 20 years now

Thank you all and especially Lex!!

Today I installed the new 330 µF 100V caps.
As predicted it were fairly easy without removing the psu board

http://imgur.com/kWncvAy

http://imgur.com/BIvabe0

I am done now, if there are any questions, I will try to help, but I am no expert
Good luck to all of you!