Vestel 17pw06-2 made some smoke

[tom66]

Re: Vestel 17pw06-2 made some smoke

Vestels have a protection circuit that detects a short circuit/undervoltage on specific lines. Look at main board schematic for info if unsure how this works but essentially low voltage will trip it out. So it looks like you have a main board issue, time to diagnose why VCC AUDIO is a problem...maybe a bad audio amplifier IC? That is a known issue on some Vestel sets.

[R_J]

Re: Vestel 17pw06-2 made some smoke

You might be able to remove the VCC_AUDIO wire from the plug that goes to the mainboard,
Like Tom said, could be bad audio chip on mainboard
Going by the schematic: if you removed L200 (24volt line) that line also feeds IC300 which is the opto for the OVP line which could shut down the (12V) section IC303 (pin1)

[jesterace]

Re: Vestel 17pw06-2 made some smoke

This will make it a teaser then. Main board must be ok because it all turns on fine with another good PSU

[R_J]

Re: Vestel 17pw06-2 made some smoke

This power supply does seem to have two +24 volt supplies, one for the backlights (L200) and one for the audio (D209 from +24V_AC)
I think this schematic has many ways of working depending on how certain jumpers are in place. It looks like some could have audio supplied by either +24volts or +12volts

[tom66]

Re: Vestel 17pw06-2 made some smoke

One other thing to be careful of is some Vestel main boards have 12V audio others have 24V audio
And they can use the same PSU just with different option jumpers
So maybe your new board works but it's just cooking the audio amp, or something odd is going on with the audio config
Either way, you need to look at what is causing that 12V audio line problems.