Acer V223w

[lexwalker]

Re: Acer V223w

what's that

Take a torchlight and shine right on to the panel screen from the top. Best is to turn off the lights in the room while doing it, and the torchlight should be as bright as possible (as some panels are quite dark to see). Check and see if there are any video images...

[Behemot]

Re: Acer V223w

Backlight is working fine, I am talking about broken driving circuitry making image trying to appear out of the display.

[lexwalker]

Re: Acer V223w

Backlight is working fine, I am talking about broken driving circuitry making image trying to appear out of the display.

Does that happen on both inputs, VGA and DVI?

Have you tried cleaning the LVDS cable, and checking the supply voltage to the panel Tcon board?

[Behemot]

Re: Acer V223w

Well I haven't even connected any input, I don't even see the "no input" window. Or I do, like 5 pixels from it flowing from side to side

LVDS has been disconnected on both sides and seems clean to me. I think I will first try another LCD panel, I am going for two displays tomorrow and one of them is wide panel which should be compatible.

[budm]

Re: Acer V223w

I would check the voltage on both end of the fuse/fuses on the T-Con board first.

[Behemot]

Re: Acer V223w

What exactly do you mean? Fuse is not burned so whatever is on one end, it is on the other end as well.

[budm]

Re: Acer V223w

Well, we did not see you report from POST 18 and on ward if the fuse is good or not or what DC voltage you are getting to the fuse.
Post 23 also ask "checking the supply voltage to the panel Tcon board?"

[Behemot]

Re: Acer V223w

Well, we did not see you report from POST 18 and on ward if the fuse is good or not or what DC voltage you are getting to the fuse.

I check everything, you think I am some amateur after all those years?

Post 23 also ask "checking the supply voltage to the panel Tcon board?"

I think I will first try another LCD panel, I am going for two displays tomorrow and one of them is wide panel which should be compatible.

Faster than removing the cover again…if it helps, I'll know the problem is in display/tcon. If not, I'll know problem is in signal board. As for the signal board, besides them all EEPROMs/serial flash memories and main microchip there is nothing else which could go bad (them two regulatorms/FETs are OK). So in such case, only replacement will be an option.

[budm]

Re: Acer V223w

"I check everything, you think I am some amateur after all those years?" We cannot tell if you have the voltage on the T-CON or not, we cannot read mind from here. If you think that is an insult, then good luck on your repair.

[Behemot]

Re: Acer V223w

For the ones who have problems with their eyes in capitals: I WILL TRY SECOND LCD PANEL DIRECTLY. SECOND PANEL HAS 100% GOOD TCON BOARD. THAT MEANS WAIT FOR ME TO TRY AND GET BACK WITH NEW INFORMATIONS.

Is that understandable? Sometimes I have the feeling you ignore what people say and just repeat yourself till the opposite side just gives up.

[budm]

Re: Acer V223w

Can you MAKE IT BIGGER LETTERS?

[Behemot]

Re: Acer V223w

OK, whatever…

[wcoyote]

Re: Acer V223w

OP here. I gave up on mine. I replaced the caps and it worked great for about a week. Then it went back to the original problem. Anyone want parts from it?

[lexwalker]

Re: Acer V223w

Well I haven't even connected any input, I don't even see the "no input" window. Or I do, like 5 pixels from it flowing from side to side

You could hook it up to a video source to keep the display going. If possible you could also try to invokke the panel self test (not sure if that panel supports self test though).

LVDS has been disconnected on both sides and seems clean to me. I think I will first try another LCD panel, I am going for two displays tomorrow and one of them is wide panel which should be compatible.

Swapping panels? Make sure you checked the panel datasheet first for pin compatibility...

[Behemot]

Re: Acer V223w

Swapping panels? Make sure you checked the panel datasheet first for pin compatibility...

They're compatible most of the times, there are several types of LVDS connections (for 4:3 displays, 5:4, 16:10 and 16:9, the latter maybe have another one with LED backlight) and if you have the right type, there's like 95% chance it will work.

I've actually acquired the smalelr version of this monitor, the V193W so hopefully it will be all the same

[Behemot]

Re: Acer V223w

Tcon is the problem. Anything I can look for on it? +5 V is fine, +3,3 V (output of one transistor in there) as well.

[lexwalker]

Re: Acer V223w

Tcon is the problem. Anything I can look for on it? +5 V is fine, +3,3 V (output of one transistor in there) as well.

If you had swapped panels and found the replacement works then most likely the original panel was the problem. Usually for this problems, I would simply find a replacement panel. Trying to find the problem on the panel's Tcon board itself is a very lengthy process and often goes nowhere (plus lack of replacements especially if the main Tcon I.C is spoiled). The most obvious place to check is usually the power supply section to the Tcon main I.C (on the Tcon board itself). Look for cracked solder joints on the I.Cs also (requires powerful magnifying glass plus bright flashlight).

[Behemot]

Re: Acer V223w

Yeah I know, jsut if you have some idea for something simple which may be it, otherwise I'll skipp it, the owner is OK with that, actually he left it here for me. And new panel is most likely not worth it, the cost is higher that price of the display itself.

[lexwalker]

Re: Acer V223w

Yeah I know, jsut if you have some idea for something simple which may be it, otherwise I'll skipp it, the owner is OK with that, actually he left it here for me. And new panel is most likely not worth it, the cost is higher that price of the display itself.

For Tcon problems, I would consider them hopeless (which is why panel replacement would be better and quicker). I've already try a couple of things like solder reflow, replacement of discrete components, direct power injection (not thru the LVDS cable), invoking self-test, etc. Most of the time I give up.

[Behemot]

Re: Acer V223w

Yeah…I'll just keep the electronics for two or three years when the 1680x1050 panels will be more common, now there's hunger for them and they are too expensive…