Hello I have a HTS3544/37 I have removed all cables from power supply board minus the outlet plug & CN905. Any help would be gratefully appreciated
CN905
on/off = +4.12v
bk5v = +4.89v
-27v = -28.2v
gnd = 0
ac2 = -23.54v
ac1 = -22.10v
gnd = 0
a/f = 0
b/f = 0
CN904
-27v = -28.05v
gnd = 0
+12v = +12.07v
gnd = 0
+5v =+5.24v
CN903
2 pins gnd
2 pins +34.88v

 

There is an old thread here with a service manual circuit....looks like it's a TL494 smpsu chip.


https://forum.allaboutcircuits.com/threads/circuit-board-help.71581/

 

I saw that but it was not to helpful to me.

 

You will need to download the service manual circuit diagram, otherwise forget it!

 

I did that but I'm lost

 

So if you don't understand a circuit diagram, how are you going to repair it?

 

Everything looks good no burnt areas /smells fuse is good

 

When i remove the 5v terminal from the CN904 i noticed that the power supply does not trip but all other plugs and terminals are plugged in. Could there be a problem on this board and not the power supply

 

Do you have a link to that circuit diagram?

 

I do

 

Sometimes it's a bad cable. Check voltages with things plugged in. Check at the PSU AND where it's plugged into another board. Obviously you should see the same voltages at both ends of the cable. If not - you've found a problem.