HP L2065 Montior problem

[mourningstar625]

This monitor originally had an issue where the screen would turn on and then off again only in windows. On bios screens or anything else before windows it doesn't show the issue. I took it apart and about 6 caps were obviously popped. I replaced them with name brand caps and the issue seems a little better (doesn't turn on and off as fast but still does it). I would love some help troubleshooting more to see if I can fix it, I don't think it's time to call it quits just yet. Here are some high quality pics of the board with the caps replaced. The circled caps are the ones I replaced, if anyone needs more info I will gladly provide.

Update: I thought the issue went away but I have narrowed it down a bit further. When the screen is displaying darker colors its fine but when there are bunch of lighter colors the screen turns off then back on and back off etc. I noticed a artifact just before this happens as a red line that appears on the bottom half of the screen but and goes from the edge to about 1/4 over not completely over. I feel its probably something with the controller board not the power board now. I hope this extra info helps in some way to narrow it down.

[1supertech]

Re: HP L2065 Montior problem

If you don't have an ESR to test the capacitors, change the rest of the caps especially near the large main caps one of them could be a start up cap.

[budm]

Re: HP L2065 Montior problem

If you don't have an ESR to test the capacitors, change the rest of the caps especially near the large main caps one of them could be a start up cap.

+1, there are two small electrolytics caps by the power transformer.

[mourningstar625]

Re: HP L2065 Montior problem

Are you talking about the two really big 450v caps ? or something else?

[budm]

Re: HP L2065 Montior problem

C130, 132 small lytics caps.

[mourningstar625]

Re: HP L2065 Montior problem

okay will try those.

[mourningstar625]

Re: HP L2065 Montior problem

replaced those caps still the same issue happening.

[budm]

Re: HP L2065 Montior problem

So are the output Voltages to the main/logic board staying steady when it does not work and the backlights stay on?

[mourningstar625]

Re: HP L2065 Montior problem

I checked power while the monitor is doing its power off and on cycle and all the voltages read correctly and don't fluctuate according to this pic from the back of the controller board. I don't know what the inverter should read at but it does change when the screen goes on and off.

Edit: On a solid black background where the monitor stays on and doesn't turn on and off the inverter is reading 4.73

[budm]

Re: HP L2065 Montior problem

The INV pin (same as BL-ON signal) is the command signal for turning on the backlighs circuit on the power supply-inverter combo board. <1V = Backlights OFF, >2V (or 2.5V) = backlighs on.
The pictures problem sounds like either the main/logic board (bad caps) or the panel.
Can we see the screen shot of the image?
You can also try heating the main board with hair dryer to see if heat has any effect on the problem.

[mourningstar625]

Re: HP L2065 Montior problem

screen shot of what image ?

[mourningstar625]

Re: HP L2065 Montior problem

a screen shot of what image ?

[budm]

Re: HP L2065 Montior problem

a screen shot of what image ?

Of what the image looks like on the screen.
Post #1
'When the screen is displaying darker colors its fine but when there are bunch of lighter colors the screen turns off then back on and back off etc. I noticed a artifact just before this happens as a red line that appears on the bottom half of the screen but and goes from the edge to about 1/4 over not completely over.'

[mourningstar625]

Re: HP L2065 Montior problem

oh, so basically if the screen is dark it displays just fine (think solid black wallpaper). If a lighter windows is brought up to the foreground the monitor turns off then back on and then off again repeatedly. There is nothing abnormal on the screen when just on the dark wallpaper.

[budm]

Re: HP L2065 Montior problem

oh, so basically if the screen is dark it displays just fine (think solid black wallpaper). If a lighter windows is brought up to the foreground the monitor turns off then back on and then off again repeatedly. There is nothing abnormal on the screen when just on the dark wallpaper.

OK.
" I noticed a artifact just before this happens as a red line that appears on the bottom half of the screen but and goes from the edge to about 1/4 over not completely over" How about the red lines? It is either the main/logic board or the LCD panel.

[mourningstar625]

Re: HP L2065 Montior problem

this doesnt show in a screen shot, and it doesn't happen all the time.