17IPS11 - No Backlight

[speedypro]

I'm aware of this post but I need to understand something before I dive into the panel to change any strips. I do not have the backlight (there is display with a torch shines onto the screen). On the attached image, red/black wires, I get no voltage. If plugged out and test, no voltage. Should there be x voltage regardless if connected or not?

[ReeceyBurger123]

Re: 17IPS11 - No Backlight

Yes, find the sch for IPS11 (inverter power supply) led drive area and test what you get vcc out the controller to the mosfet. Also check for short circuits on the led drive area output.

[vinceroger69]

Re: 17IPS11 - No Backlight

The schematic is in the other thread but added to this one for easier access

[speedypro]

Re: 17IPS11 - No Backlight

Thanks.

[ReeceyBurger123]

Re: 17IPS11 - No Backlight

Any luck ? Ive not had this issue on these Psus yet they are actually very very reliable in terms of Vestel.

[speedypro]

Re: 17IPS11 - No Backlight

Any luck ? Ive not had this issue on these Psus yet they are actually very very reliable in terms of Vestel.

Yes. MP3394 needed replacing and also a led strip. TV is now working like new. Thanks.

[ReeceyBurger123]

Re: 17IPS11 - No Backlight

Good job, usual suspects seems sometimes if an Led fails it can kill the driver Ic. Watch the lastest video on an Lg where there was a bad Led which also took the driver out as well.

[Andrew F. Ali]

Re: 17IPS11 - No Backlight

Good job, usual suspects seems sometimes if an Led fails it can kill the driver Ic. Watch the lastest video on an Lg where there was a bad Led which also took the driver out as well.

Reecey, do you have the link to view this video???
Thanks.

[vinceroger69]

Re: 17IPS11 - No Backlight

i think it maybe this one ive just watched
https://www.youtube.com/watch?v=C567h02AqS0

[ReeceyBurger123]

Re: 17IPS11 - No Backlight

That is it Vince filmed that ages ago just got round to uploading

[Andrew F. Ali]

Re: 17IPS11 - No Backlight

Thanks vince and Reecey.

[JoeBug]

Re: 17IPS11 - No Backlight

i just got Toshiba with same board, one open LED in the backlight, all LEDs are in serices. When not connected(and when connected too, due open LED, voltage rise hight ( 50v on multimeter) then start droping to 0 (cap discharge).
Seems planned to be so, as i can see on the Open LED Protection chart, page 5 on the datasheet.
Fixed the open led, everything OK now. But my point was - when backlight disconnected, no voltage at the connector (rise hight, then stop and drop to 0)