Viewsonic LCD VA1703wb

[roamingraman]

Viewsonic LCD VA1703wb : opened one va1703wb model viewsonic monitor for the problem 'backlight turns off in 2 seconds'. Replaced all the capacitors still problem persists. It uses MP1008ES in the inverter board. When I downloaded the diagram it says the inverter contains OZ series chip on it!! Can anyone suggest where is the current sensing / ovpt for MP1008ES chip and how can I disable the ovpt??

[budm]

Re: Viewsonic LCD VA1703wb

So does it use the MP10008ES PWM IC or the OZ XXXX BY O2 MICRO?
Do you have the diagram?
Does your board look like this?
http://s807.photobucket.com/albums/y...ic%20VA1703WB/

[roamingraman]

Re: Viewsonic LCD VA1703wb

Thanks budm..it uses MP1008ES .. I couldnot get the diagram!! The board is not looking like this (*ttp://s807.photobucket.com/albums/y...ic%20VA1703WB/) as shown in that

[budm]

Re: Viewsonic LCD VA1703wb

Ft pin4, when it is HIGH it will activate the shutdown. So monitor that pin with the meter.

[roamingraman]

Re: Viewsonic LCD VA1703wb

oh thanks again budm... Is there a chance to eliminate the current sensing?? I have confirmed the lamps are ok by connecting different lamps.

[budm]

Re: Viewsonic LCD VA1703wb

So you connect the good set of lamps to this board and they stay on? I am a little confused.
"I have confirmed the lamps are ok by connecting different lamps."

[UniT3d]

Re: Viewsonic LCD VA1703wb

Hmmm .....

Pardon me for butting in ...

... Is there a chance to eliminate the current sensing??

It's there for a good reason. Two minuses doesn't make a plus ... Best to figure out why current sensing cuts out.

I have confirmed the lamps are ok by connecting different lamps.

I'm scratching me head as how can this deduction be possible ....

[selldoor]

Re: Viewsonic LCD VA1703wb

The board is not looking like this (*ttp://s807.photobucket.com/albums/y...ic%20VA1703WB/) as shown in that

I think we need to see pictures of your boards


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/attachm...1&d=1290283049

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

[roamingraman]

Re: Viewsonic LCD VA1703wb

thanks budm... I think i have confused you. Came to say even when a good set of lamps are connected to the board, problem persists. I came to say it is NOT problem with lamps. It should be problem with the inverter board. Will upload photos little later