Sansui SV-PD403

[burntfingers]

Set does not turn on.
When pressed, Standby light flashes blue some six or seven times and returns to yellow.
Nothing else happens.
Checked for dry joints, bad caps, plugs, visually there's nothing wrong.
Can't find the diagram, also.
Y and X boards look good.
Tried to unplug some power plugs, nothing.
Have you had this set here before?

[ReeceyBurger123]

Re: Sansui SV-PD403

Checked all fuses on Psu ?

[burntfingers]

Re: Sansui SV-PD403

Only found two, OK - one in the mains entrance and another round one on the PS.
Are there more?
Something is not helping the two mains relays [for AC] to close and "fire" the set.

[ReeceyBurger123]

Re: Sansui SV-PD403

Ok, need close up images of the Psu.

[burntfingers]

Re: Sansui SV-PD403

OK, here are three new pictures of Power Supply board - one taken on its length, the other two half of its height each.

[ReeceyBurger123]

Re: Sansui SV-PD403

Ok right do you get Vs & Va voltages when you try to turn the Tv on ?

[burntfingers]

Re: Sansui SV-PD403

They both read zero volts at switching on.
I only get one of the 5 volts, nothing else.

[ReeceyBurger123]

Re: Sansui SV-PD403

Right ok, do you know how to check resistors ?

[burntfingers]

Re: Sansui SV-PD403

I do, and already checked the high wattage ones, they are OK.
Didn't find any fuse ones, couldn't find any.
The power can only come on after the two relays are activated.
Could I bridge them to see if I get power?...

[burntfingers]

Re: Sansui SV-PD403

I've been looking for the service diagram, but so far no luck.
Does anybody have it?

[fzabkar]

Re: Sansui SV-PD403

Here is a [blurry] PSU circuit diagram from a Konka PW-1450:


Perhaps the flash codes will be similar to those of other Konka plasmas.

[burntfingers]

Re: Sansui SV-PD403

Thank you.
This youtube video suggests it could be a thermal fuse under the switch mode power transformer.
Going to investigate it.
[Diagram, unfortunately, not clear enough to read values]|


https://www.youtube.com/watch?v=qQ_iLxx3Fj4