Viewsonic VA1931W Auto Off after 10 to 15 minute..

[lorins_core]

hello there.

i need advice technically about my lcd monitor Viewsonic VA1931W Auto Off after 10 to 15 minute...

here the actual image of PSU Model PWB-1271-03 A E053112713





no caps blowted....

any advice...

[budm]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

So when it goes off, the Video signal from PC is still present? Or you have the PC set to turn off the monitor in 15 minutes?
And it also happens consistently at 10~15 minutes?

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

So when it goes off, the Video signal from PC is still present? Or you have the PC set to turn off the monitor in 15 minutes?

I already set the turn off all power saver on pc all setting are no monitor sleep or turning off. and also i try to may laptop. still same total turning of around 10 mins. i think the monitor have problem?

Thanks Master Budm.

[budm]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

OK, so when you say it turns off, you mean it acts as if some one turns off the power switch and not due to the monitor goes into standby mode, right? I do not remember what the power indicator turns AMBER color when it is in standby and Green when power switch is turned on, and LED is completely off when it is turned off.

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

hahahaha. i think this unit are over heating.. hahahah


how to find the solutions for this unit.. hahahaha

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

maybe the problem is TOP254en? ic. it so weird around 10 to 15min auto off then press the power to on. cannot turning on. unplug the power cord wait around 5 min. plug in again ok have power working after 10 mins turn off.

i think they have problem on supply?

anyone have idea and how to fix it... help

TIA

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

or if have diagram of this Component. Thanks

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

OK, so when you say it turns off, you mean it acts as if some one turns off the power switch and not due to the monitor goes into standby mode, right? I do not remember what the power indicator turns AMBER color when it is in standby and Green when power switch is turned on, and LED is completely off when it is turned off.

Master budm. Indication of Light is Blue. it is not Standby. It is a Auto Shut Off

[budm]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

So the indicator light stay on blue then when you lost the image on the screen and also the backligts go out? If that is the case then you either you have bad inverter backlights circuit, or bad lamps (bad connection on the ends of the lamps), or the main board stops sending the BL-ON signal. The power supply is an always on so if you do get any indicator lights then the power supply primary side is working to produce the dcv to run the main board otherwise you will not get any indicator light when it shuts down by itself.

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

So the indicator light stay on blue then when you lost the image on the screen and also the backligts go out? If that is the case then you either you have bad inverter backlights circuit, or bad lamps (bad connection on the ends of the lamps), or the main board stops sending the BL-ON signal. The power supply is an always on so if you do get any indicator lights then the power supply primary side is working to produce the dcv to run the main board otherwise you will not get any indicator light when it shuts down by itself.

Master Budm this Case. How Can I Do. What Part have Need To Change? Would you Teach Me. Please

[budm]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

I use test lamps (at least 2) to help narrowing down the problem first.
If you do not have spare test lamps, then you can use this setup:
https://www.badcaps.net/forum/showth...er+testing+cfl

Bad lamps, bad lamp wiring.
http://s807.photobucket.com/user/bud...?sort=3&page=1

BTW, can you still se the images on the screen when the screen black out? You can use flash lights (torch) on the screen to see if you can see any images on the screen at all.
https://www.youtube.com/watch?v=xUzCLgoSPGM

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

I use test lamps (at least 2) to help narrowing down the problem first.
If you do not have spare test lamps, then you can use this setup:
https://www.badcaps.net/forum/showth...er+testing+cfl

Bad lamps, bad lamp wiring.
http://s807.photobucket.com/user/bud...?sort=3&page=1

BTW, can you still se the images on the screen when the screen black out? You can use flash lights (torch) on the screen to see if you can see any images on the screen at all.
https://www.youtube.com/watch?v=xUzCLgoSPGM

Thyanks Master. I'll Try it

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

Master Budm. I Try to Do That. Not Luck . same as The Unit Auto Off.
Also I have Same Model of This Unit I Try to Swap the working LCD Panel Same Problem. out Off or Shut off. 10 Mins.

now i have clue in psu are. may be on cold area i don't know which part are fault? Help me to find. Thanks

[dick_barton]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

R853 does not look right. Is there solder bridging the two ends????

[lorins_core]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

R853 does not look right. Is there solder bridging the two ends????

thanks for notice the bridging. but i already to clear up. but same auto off 10 mins.

did you think the Inverter driver ic? 16 pins 851 ic or 8 pins 852 .
or other else on Cold area

[dick_barton]

Re: Viewsonic VA1931W Auto Off after 10 to 15 minute..

I would run a soldering iron over as many of the connections as possible. D813 for example looks as though the pins are poking through the solder and poorly attached however it may well be the photo angle, but I would check that.