VESTEL 17IPS20 in 48" Tosh LED, dead...

[Alastair E]

I have this 48" Tosh thats dead--no supplies to M.B. checks on PSU indicate the 12V supply is pulsing between 0 and 6-9V.

No apparent short diodes or mosfets.

Confirmed MB and panel are OK by plugging in a 17IPS20 from a 40". Set boots, has no backlights (as wrong PSU) but has images on screen, so set is basically good, just PSU crapped out.

Ive not needed to do much with these IPS20 PSU's in past--Any ideas?

[dick_barton]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

There appear to be a number of models for this supply. Is the 400V up and have you just lost the 12V & 24V drive voltages?

[Alastair E]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

There appear to be a number of models for this supply. Is the 400V up and have you just lost the 12V & 24V drive voltages?

There's Loads of different versions of that PSU. PFC isnt running--as set doesn't turn on--no 5 12 or any other voltages.

Only voltage present is a pulsing 5-9V on the 12V filter-caps--Thing appears to be squegging and not running...

[Alastair E]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Cheers for the schemes....

I Really would Love to know what kind of shit they were smoking when they designed and drew out That abortion!

[ReeceyBurger123]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Check the ceramic caps near the pfc controller Ics for short circuits.

[dick_barton]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Do you have VCC_Main from which VCC is derived. I had a similar problem on a power supply when the transistor had gone faulty. Maybe worth a quick check of Q207, Q208 and especially Q216

[Alastair E]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Cheers, Will check those....

[ReeceyBurger123]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Ive also had the pfc diode, MUR460AX go leaky, not shorted but leaky causing low pulsing voltages.

[Electronico]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Hi everybody! Been around the forum for awhile (very helpul, thanks ) but this is my first post. I think I have the same fault that Alastair. The set is a 40" Vestel with 17IPS20 Psu. No fuse blown, no shorted transistors, no shorted diodes but no out voltage . I only have a pulsating voltage on the secondary diodes that goes this way:

With main board connected: Fast pulse, 11V-3V
With mainboard disconnected:: 11.8V then slowly falling down to 7V, then up again,the down,then up...

You can hear a "tack" on the Psu every time the voltage goes up.

I replaced U202, the PFC diode (as Reecy suggested), Q201, checked Smd components for bad measures or shorts, but no luck...

Did you finally repair your set Alastair?

Any help will be very apreciated. Thank you.

[ReeceyBurger123]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Speak of the devils I got a dead IPS20 to do later

[ReeceyBurger123]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Also Ali update us mon I need to know the fault because Im a nosey twat !!! Guessing one of the switching controllers as Ive had this on these before.

[satinser]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

I also have the same pulsing did anybody manage to find the cause. I suspect the pfc chip itself?

[fluxflux]

Re: VESTEL 17IPS20 in 48" Tosh LED, dead...

Hi everybody,

I'm bringing this topic back...

I've the same problem with the following set:

DUAL 39 LED TV
DLE39F182P3CV2
https://www.dual.de/produkte/tv-geraete/dle39f182p3c/

MB: 17MB95 R3
PSU: 17IPS20

Checked the Diodes and MOSFETS.

I'll try to make a video of the pulsing. It is between ~0 - ~7 V DC

Kr

FluxFlux