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Main => Monitor/Video Forum => Topic started by: jimmy2x2x on September 16, 2010, 01:55:10 pm

Title: Viewsonic VA2216w LCD - power cycling issue?
Post by: jimmy2x2x on September 16, 2010, 01:55:10 pm

The above monitor has developed a very annoying issue!

When I turn the monitor:

power light on
displays the image for about 1/2 a second
power light turns off
display turns off
waits about 3 seconds then repeats


Any ideas what might be the cause of this?

I haven't opened it up yet, as I am waiting for a response from Viewsonic - it might be under warranty, depends if they are sticklers for the original receipt - which I cant find ;(

cheers

Title: Re: Viewsonic VA2216w LCD - power cycling issue?
Post by: qrz on September 16, 2010, 03:51:11 pm

most likely caps in the smps.

usually 470uF/25v.  replace even if check ok  and use 105 degree
some use 220uf . won't hurt to increase value.

Title: Re: Viewsonic VA2216w LCD - power cycling issue?
Post by: jimmy2x2x on September 16, 2010, 04:02:13 pm

Thanks!

That doesn't mean a whole lot to me unfortunately, as soon as I get a response from viewsonic regarding the warranty (don't think it will go my way) I will post back with some pics of the innards

Im tempted to do it now, but I will wait on and see what they say

Title: Re: Viewsonic VA2216w LCD - power cycling issue?
Post by: jimmy2x2x on September 17, 2010, 09:12:11 pm

No joy on the warranty

this is what is looks like inside

(http://i53.tinypic.com/10yoy2u.jpg)
larger here http://i53.tinypic.com/10yoy2u.jpg (http://i53.tinypic.com/10yoy2u.jpg)

(http://i54.tinypic.com/30rvhoy.jpg)
larger here http://i54.tinypic.com/30rvhoy.jpg (http://i54.tinypic.com/30rvhoy.jpg)

Title: Re: Viewsonic VA2216w LCD - power cycling issue?
Post by: qrz on September 18, 2010, 09:57:49 am

i'd replace c501 and the one next to it ( use 35v/105 degree) and check/replace the 1000/25 - again 35v/105 degree
i'd up the 470/10 and 1000/10 to 16v/105 degree ratings.
mfg's tend to under rate caps    i.e. 6.3v caps on a 5v line    :timebomb:

while its open, it wouldn't hurt to check the 3 caps on the primary side

wouldn't mind seeing a nice foil side pic of the pcb  ;)

Title: Re: Viewsonic VA2216w LCD - power cycling issue?
Post by: jimmy2x2x on September 18, 2010, 12:45:46 pm

Sure thing!

(http://i53.tinypic.com/6ek938.jpg)
Larger here http://i53.tinypic.com/6ek938.jpg (http://i53.tinypic.com/6ek938.jpg)

Im really not sure how to test caps, discharge them etc... Although replacing them looks relatively easy on a board like this.

I have some reading to do!

Title: Re: Viewsonic VA2216w LCD - power cycling issue?
Post by: qrz on September 18, 2010, 08:16:46 pm

tnx, jus' wanted to do a visual inpection for defects. not as good as in hand , but still looks ok .

don't worry about discharging .  nothing of concern , it all bleeds off in a short time .

change the secondary caps an' it "should" be fine...