HPvs19

[terminatorX]

Hello! Has been a while since last time.
So to the symptoms. It lights up normal and everything except the colouring of the picture is way off. It's like if you are on the google page the white parts are all black and the black lettering is white. Almost like it's inverted but not quite.
On a Xp machine you got the blue activity field and it's all read. The picture quality is overall poor. To mention I have tested to autoadjust and change colours etc but no success. So that's why I'm here to perphaps solve this.

[selldoor]

Re: HPvs19

Hi You will recall I love a picture or two, but a few things to try first.
Have you tried this monitor on another pc or laptop.
Have you tried another screen on the computer.
Have you removed, cleaned and reseated the 1 vga cable.
(or2 DVI cable) If using 1 try 2 or 2 try 1.
Have you spare cables to try.

Reseated the video card on the pc?

Tried a factory reset on the monitor.

If all that fails take it apart and do a few pics- one of the fault would be helpful as well.

Inside, unless it is permanently fixed to the screen remove and clean and reseat the lvds cable.

[terminatorX]

Re: HPvs19

Yes I have tried the monitor on another PC, a laptop actually.
The PC it self is not to blame it usually have another screen that have no problem. I just got this monitor from my friend. Different VGA cables where used since it only has this conncetion. What I didn't do before my first post was factory reset but this has been done now and nothing changed at all.
Here is a picture on how it looks when having the google page up.
If you have nothing more to ad for testing I'll take it apart again and post pictures on the power and the graphics board. Just to ad it doesn't look like any pixels are damaged.

[selldoor]

Re: HPvs19

Nothing external to add - internal , if it is removable remove and clean the LVDS cable - usually flat at the panel end.

Pictures
each board, front and back 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...1&d=1290283049

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

[inline79]

Re: HPvs19

I agree best place to start is the ribbon/cable going to the lcd panel. i think i had a vs17 with the same problem.

[terminatorX]

Re: HPvs19

Hello again!

Hope these pictures are not to bad.

The last picture on the cable is that the cable you mean that could be the cause? It's still attached to the screen don't know how it looks at the other end though...

Tried to find a function that would elimintate what you refer to as inline and offsite but couldn't so....

Sounds interesting that you had similar problems inline79 =)

[terminatorX]

Re: HPvs19

Should I try to detach the cable on the last picture?

[momaka]

Re: HPvs19

Yes.
When you do, you should get a white or near-white screen.

[terminatorX]

Re: HPvs19

Hello and thanks for you respons momaka!
Did what you said and I got a white screen picture just as in the picture.

[momaka]

Re: HPvs19

Hmm..
Hard to say if the issue is with the t-con board or the video board. I do see a lot of CapXon caps on the video board (more particularly it's the smaller ones I'm suspecting... the bigger ones are for the headphone/speaker amplifier).

Do you have a multimeter and know how to use it? Perhaps before me suggesting to change the capacitors on the video board, maybe you can check some of the voltages on the t-con. To do that, post some pictures of the t-con so we can tell you which points to measure.

[terminatorX]

Re: HPvs19

Hello again after a long time=) Thanks for your interest momaka.
I do have a multimeter and my usage capabilities are decent. Nevertheless please be exakt with what you mean and advice from experienced are always appreciated.
Actually first time I heard of the t-con board so after googling I took the pictures below hope it's right.

Just got one question. Would it be possible to identify a faulty capacitator with an IR gun. Maybe lacking the possibility to build up charge maybe causes it to be significantly colder than the other capacitators?

[budm]

Re: HPvs19

Check that F1 fuse to see if it is open. It looks like the T-CON is not getting the power due to open fuse on the T-CON or the main board may not be sending either 5V or 12V to power the T-CON board.

[momaka]

Re: HPvs19

Well, since there IS an image on the monitor (messed up colors aside), then fuse F1 on the T-con should be fine.

One thing you can check is the voltages on the t-con. Lucky for you, the test points in the power section of the t-con are labeled.

Using this picture as a reference
https://www.badcaps.net/forum/attach...4&d=1351875415
Do the following:
1) connect all cables and boards in the monitor normally
2) set your multimeter to measure voltage
3) power on the monitor and measure the voltage between ground and the following test points on the t-con: VDD, VGH, VGL1, VGL2, VCC (VCC is shown in the 3rd picture you posted, a bit above the t-con main connector)
Note: if your multimeter is manual ranging, make sure to set it to a scale that can measure up to 50V. On some monitors, VGH can be as high as 35V or higher (depends on design).
4) report the voltages you got for the above test points.

Those test points show the voltages at the various voltage rails on the t-con. If you're interested in knowing what those voltage rails are, read the end of this post:
https://www.badcaps.net/forum/showpo...02&postcount=7

On your monitor VIN is the main 5V (or is it 3.3V?) power supply rail to the t-con. VCC is the regulated 3.3V, 2.5V, or 1.8V rail for the TFT driver IC. VDD is the main boosted voltage rail (the main step-up). Finally, VGH and VGL1/VGL2 are the secondary step-up voltage rails (with VGL1/VGL2 actually being negative).

Would it be possible to identify a faulty capacitator with an IR gun.

With a thermal IR camera - maybe (but those are very expensive)
With an IR gun - I don't want to say impossible, but it almost is. Reason for that is because you just can't get enough temperature accuracy. You'll probably have more luck by just touching the capacitors with your fingers - and even that doesn't say much whether the cap is good or bad. Also depends what kind of cap you're talking about. Ceramic caps normally short out when they fail. If the power supply doesn't shut down or a fuse doesn't blow, they will usually overheat quickly and even possibly burn the board. But more often than not, the former happens - i.e. a fuse blows somewhere or the PSU shuts down due to the overload. And when that happens, you have a cold ceramic caps that appears normal just like the other working ceramic caps. On the other hand, an electrolytic cap may or may not run noticeably hotter when it begins failing - it all depends on the circuit it's in. So checking the temperature of the caps with an IR gun is not very useful most of the time.

[budm]

Re: HPvs19

The picture as shown in post 9 is complete BLANK, but the earlier picture in post 3 did show graphic on the screen.
Correction: now I see why post 9 shows white glowing screen, you have instructed him to disconnect the cable, sorry, miss the other posts.

[momaka]

Re: HPvs19

The picture as shown in post 9 is complete BLANK, but the earlier picture in post 3 did show graphic on the screen.
Correction: now I see why post 9 shows white glowing screen, you have instructed him to disconnect the cable, sorry, miss the other posts.

No worries. I almost did the same thing too since this thread has sat quiet for a while. I was actually about to submit a huge post prior to the post above, explaining how to troubleshoot a blank screen. Good thing I decided to go over the thread again .

[terminatorX]

Re: HPvs19

Hi! Has been a while and thanks for your inputs!
So I have tested all the points VIN is 5.11V, VDD:10.47V, VGH 21.03V, VGL1:-5.06, VGL2:-5.06 and VCC:3.314V.

Hope to see what you say on this=)

[momaka]

Re: HPvs19

The voltages on your t-con board seem to be fine, so at least we know the weird colors are not due to that.

Try this: connect everything in the monitor the way it should be, then connect it to a computer and display a normal picture. Finally, bring up the monitor's OSD/menu. Do the OSD colors look inverter too or are they normal?

I'm inclined to think this is a video board problem now. I've never spent much time troubleshooting those, so I don't know what could be bad. I doubt the caps on it are the problem, but if you have replacements on hand, it won't hurt to replace them.

[terminatorX]

Re: HPvs19

I have tried to tweak stuff in the overall menu option but there is none or very little change in picture.
Do you believe this is a dead case, I guess it could be if the chip would be broken somehow? I do not have any capacitators at hand.

[selldoor]

Re: HPvs19

A couple of things you could try are pressing gently on the main video chip (with a plastic or wood tool and observing if the screen changes.
Likewise you could try gently heating sections of the main board with a hairdryer and again observe if there are any changes. Then if there are try and narrow it down to a smaller section then component.

[terminatorX]

Re: HPvs19

Hello!

Ok I tried pressing the chip and zero change here. This led me to try the owen method.
Maybe a little invasive. Tried heating on 385F during 10 minutes and slowly cooling it down.
The large caps is a little bulgy now but I tried reassemble it and there is no change at all after this test on the picture. I guess we are all out of tests?