Benq FP202WA white screen

[miligor]

One day monitor dies. No led, no nothing. Resoldering, replacing capacitors, measuring semiconductors, no result. One big fuse ok. But, one picofuse opened in Vcc line of TL1451A. Replacing picofuse. Monitor woke up, but only white screen. LED functioning is back. Why only white screen?

[retiredcaps]

Re: Benq FP202WA white screen

LED functioning is back. Why only white screen?

A few people during reassemby (or during disassembly) have accidentally loosened the connector cable between the logic card and the panel. Check yours.

[sofTest]

Re: Benq FP202WA white screen

White screen often means bad fuse on the video board (the board connected to the logic board, often on the top back of LCD panel).

[Samsunguser]

Re: Benq FP202WA white screen

I have the same problem. No life, no led.
"But, one picofuse opened in Vcc line of TL1451A. Replacing picofuse."
Where is the picofuse here?

[selldoor]

Re: Benq FP202WA white screen

I cant see a pico fuse - you cannot be sure that he had the same board as you.

Please can you delete your pictures and add them using manage attachments.


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 what the supposed fault was and a bit about yourself - skills tools etc.

[selldoor]

Re: Benq FP202WA white screen

Thanks , so , no pico fuse. Pictures are not good the one of the back is no use at all for troubleshooting.
Do you have a multimeter and soldering equipment


EDIT


Whoa - sorry I think there may be a fuse - a yellow torpedo style right at the top of your picture
just behind the heat sink - what is the board designation for that F??? perhaps

That is one reason we ask for good clear pictures.

[Samsunguser]

Re: Benq FP202WA white screen

Yes a have a multimeter and soldering equiment.
You mean this? I checked it and it's good.

[selldoor]

Re: Benq FP202WA white screen

Yes - does it say Fxxx near it on the board?

Are you happy checking High (mains)voltages or do you want to start low?

[Samsunguser]

Re: Benq FP202WA white screen

Yeah it says F851(5A) and another one FP801(2A).

[selldoor]

Re: Benq FP202WA white screen

Well may as well start low. Connect it all up.
Meter on vDC 200 put black probe on a ground screw and check all the pins on the connector - right hand side middle of the board. Does it say on the board what the voltages are supposed to be? Take care not to touch any heatsinks, they may be live.

[Samsunguser]

Re: Benq FP202WA white screen

Ok. I replace the F851 and now i have the wite screen.

[selldoor]

Re: Benq FP202WA white screen

I am not following this - you said earlier
"You mean this? I checked it and it's good."
Now you are saying you have replaced it?

Which fuse have you replaced the white one or the yellow one
remember I cannot read the numbers so have no idea.

We are going to need a really good picture of the board after the main board
- may be attached to the panel. - Panel Board or Tcon

[Samsunguser]

Re: Benq FP202WA white screen

The yellow one that i mark one the picture. Thx for your help. Now i'm confused why i dont have picture.

[selldoor]

Re: Benq FP202WA white screen

Ok We need good quality pictures of the other Boards in your monitor

[fuke]

Re: Benq FP202WA white screen

Can somebody tell me which are the output voltages on the power suply on this monitor , or does somebody have a service manual please.
I have a monitor without a power suply -.-
Regards.

[budm]

Re: Benq FP202WA white screen

@fuke, are you asking about the EXTERNAL power supply? This FP202WA as shown in this thread uses internal power supply/inverter board combo.

[fuke]

Re: Benq FP202WA white screen

I need voltages from inverter to main board , internal ofc , i have a lcd , main board but no power suply (inverter). Couldnt find service manual or schematic of power or main board.
Ty.