proview pv190wlcm

[gasinmars]

hi guys i have an lcd computer , when i turn it on i recived a white color all the time , can someone guide me how to fix it

[selldoor]

Re: proview pv190wlcm

Welcome to the forum-
We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back (in the same orientation) and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed

https://www.badcaps.net/forum/attach...7&d=1280167246

https://www.badcaps.net/forum/attach...6&d=1280167246

https://www.badcaps.net/forum/attach...4&d=1280167246

It will be useful if you can say a bit about yourself - skills tools etc.

[gasinmars]

Re: proview pv190wlcm

her it is

[gasinmars]

Re: proview pv190wlcm

i have multimeter , solder iron , flux .

[selldoor]

Re: proview pv190wlcm

OK - Need bigger pictures of each board front and back and also the one attached to the panel.

While you do that try taking off the LVDS cable (from the main( green) board to the panel clean and replace.

[gasinmars]

Re: proview pv190wlcm

here are the pictures

[selldoor]

Re: proview pv190wlcm

Main board pic front is not really clear enough - you need better light - near a window or outside? In the last picture you show the board fixed to the panel. I need a clear picture
of that board - take it in 3 sections to get it bigger.

[gasinmars]

Re: proview pv190wlcm

pics

[selldoor]

Re: proview pv190wlcm

Golly this is hard work! On the up side the pics are much better.- Thanks
When a screen is all white it is often due to a problem on the long thin board attached to the panel. The best way to get a picture is to take 3 - left centre right. You may need to fold the plastic back and sellotape it.

Did you clean and replace the LVDS cable and have you tried the minitor with a source (PC) attached

[gasinmars]

Re: proview pv190wlcm

yes i have been cleaned the lvds cable and still white screen ,even if i connect the lcd to the pc and not connected to the pc still white screen .


how to determine if the problem from power supply or logic board

[gasinmars]

Re: proview pv190wlcm

can anyone help me?

[selldoor]

Re: proview pv190wlcm

We are waiting for you to post pictures of the long thin board.

[gasinmars]

Re: proview pv190wlcm

you want pic logic board or power suplly?

[gasinmars]

Re: proview pv190wlcm

logic board

[selldoor]

Re: proview pv190wlcm

The long thin board outlined in red in post 9

[gasinmars]

Re: proview pv190wlcm

okay know iam understand , do you think that's the problem ?


look from what iam thinking the problem is from the powersupply because when i mesure 13 v pin, it will show on the multimeter 0 volt

[Behemot]

Re: proview pv190wlcm

You DO measure the voltage against ground, right? I don't think PSU is bad anyway, you won't get anything without it. Obviously backlight works otherwise it would be black so problem is either logic board or the display's board.

[Davi.p]

Re: proview pv190wlcm

Instead of making pictures you can first search for a little white smd fuse on the panel's board (the long one), it is often marked as F1 or F2 and test it, the reason that you doesn't measure those 14v (not 13) is that there isn't the jumper jp206 and is normal by the factory, the panels runs at 5v usually, somethimes at 12v, maybe in other sub models there's the need of the 14v line to the main board (for the panel probably)