Rigol 1052e DSO

[Wolfgang Felber]

 :(Hi all, I am a newbie to this forum, I have problem with a Rigol 1052e, the power supply has just stopped working. I have gone through the usual suspects, changed all the electrolytics  but still no life. I am getting 338 volts DC at the transformer, I thought that it should be an AC voltage after the TOP247yn offline switching unit. I have checked the other capacitors on the board by removing them and testing them, they all seem to be OK. I have managed to get a Schematic off the webb which was hand drawn but looks pretty accurate. I am leaning towards the TOP247yn as being the culprit but am open to suggestions. I know you probably need another Scope to test things. Open to suggestions. Enjoy the blog's. Thank you

[Wolfgang Felber]

Hi from the Newbie, I forgot to attach the Schematic of the 1052e, it doesnt show the switch, fuse 100uf filter cap. What I forgot to mention this morning was, the fuse did not blow the scope just went dead. hopefully someone can help, much appreciated.

[Wolfgang Felber]

Please find copy of the schematic for the Rigol 1052e

[stj]

TOP's are known to fail if they go into a startup-loop because of a dried startup capacitor.

i replaced probably close to 100 while repairing set-top boxes for a shop.
having said that, switching psu's often have a habit of cascade failing.
that is, one thing fails and takes out a few other parts.
so check all the diodes and resistors on the primary side of the transformer before you power it up again.
and check the TOPswitch for shorts between the pins.

[Wolfgang Felber]

To the person who gave that information, Mate, I owe you a beer, thank you so much. You are a legend. I got it going by replacing the 2 meg resistor between the main cap and the top 247yn. A 48 cent part. ; ;

[stj]

good.
glad nothing was burned in a way that would damage the pcb. 

[tautech]

To the person who gave that information, Mate, I owe you a beer, thank you so much. You are a legend. I got it going by replacing the 2 meg resistor between the main cap and the top 247yn. A 48 cent part. ; ;

The SMPS controller IC's VCC HV dropper resistor or resistor chain is a common SMPS failure point and just as stj says, one of the things you must check.
Another I've often found is the low value (20-50uF) VCC electrolytic cap, they go low value and/or high ESR.