Salora sp2

jack__ · Guest

My salora maestro 28" tv is dead. I found flyback diode bym36e which was broken. I reply the diode but it broken again. Where is the fault?

Guest · Posted: Thu Aug 14, 2008 5:16 pm Post subject:

Any idea? I dont find any short circuit flyback line.

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Guest · Posted: Fri Aug 15, 2008 4:37 am Post subject:

The diode is VO30 (BYM36E). Yes I mean shorting out. I think that current rise too high, but I don't find any fault . TV tried to start but then diode shorting out.

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Guest · Posted: Fri Aug 15, 2008 6:13 am Post subject:

I dont't have variac so I have to try isolate. How I isolate all the places U1? What is the component that regulate the system?

torbjorn · Joined: 07 Jun 2007 Posts: 370 Location: Sweden

I don't think the power supply can deliver so much current that just the current would damage the VO30. It is more likely that it is too high voltage across the diode that causes it to fail.

Check the snubber network across the diode, RO107 and CO074. Also, it can be a good idea to check the snubber components on the primary side of the switching transformer, VO07, VO08, CO14, CO21.

The voltage control circuitry is around VO12 and NO03. For example, if one of the resistors RO026 or RO030 goes open circuit or if the photocoupler NO03 is bad, the power supply will get out of regulation. Also, you will get no voltage control if the supply voltage for the photocoupler, that seems to be 5 V and come from the NO04, is lacking.

Guest · Posted: Fri Aug 15, 2008 3:40 pm Post subject:

I check all the components and any of them was not open circuit.

Guest · Posted: Sat Aug 16, 2008 10:44 am Post subject:

Any other ideas? Where the fault can be find?

Guest · Posted: Mon Aug 18, 2008 5:08 am Post subject:

How I can measure TDA16846? What will be happen if NO01 is broken?