ACER AL2423W - no display

[dondrusco]

Re: ACER AL2423W - no display

No display - means no backlight, but display shows a picture, or backlight is on, when power led is green, and off, when power led is orange.
The second option might be caused by no voltage on display controller (on LVD cable)

[twistedlizzard]

Re: ACER AL2423W - no display

Replaced the power supply.. Still same issue.. Changed all three fuses with new ones on the power board and still no display. Totally clueless now on what is wrong with it. When you power it on, the light goes to green then changes to orange and nothing.. not even the logo comes up on the screen. Any ideas?

[PlainBill]

Re: ACER AL2423W - no display

https://www.badcaps.net/forum/attachment.php?attachmentid=12979[/URL]

I am trying to replace the inverterboard pictured above on my Acer AL2423W but can't seem to find the part anywhere. I have tried all of the part numbers listed on the board and nothing.. Would anyone happen to know where i can locate this part? Thanks..

What is wrong with it? Why not repair the original board?

PlainBill

[twistedlizzard]

Re: ACER AL2423W - no display

https://www.badcaps.net/forum/attachment.php?attachmentid=12979[/URL]

I am trying to replace the inverterboard pictured above on my Acer AL2423W but can't seem to find the part anywhere. I have tried all of the part numbers listed on the board and nothing.. Would anyone happen to know where i can locate this part? Thanks..

[PlainBill]

Re: ACER AL2423W - no display

I've been searching the "no signal" problem during the boot proces of my computer and found this article. I've tried it and it worked for me.
When I boot up my computer with DVI I can now see the bios etc. This is the link:
http://blog.komeil.com/2008/06/fixin...no-signal.html

Tonnes

Congratulations, and thanks for the update.

PlainBill

[tonnes]

Re: ACER AL2423W - no display

I've been searching the "no signal" problem during the boot proces of my computer and found this article. I've tried it and it worked for me.
When I boot up my computer with DVI I can now see the bios etc. This is the link:
http://blog.komeil.com/2008/06/fixin...no-signal.html

Tonnes

[PlainBill]

Re: ACER AL2423W - no display

I've changed the five capacitors that you have circled in blue and it's working!!!!
I've got one question: When I turn on my computer the monitor starts with "no signal". I am getting signal when i have to fill in my password so i don't see my bios etc. I am using the dvi cable and windows 7 at 1920x1200.

Thanks very much for the advice everyone who helped me.

Glad to hear it's working. I suspect the 'no signal' problem is a function of the bios or Windows 7 initially defaulting to VGA output.

PlainBill

[tonnes]

Re: ACER AL2423W - no display

I've changed the five capacitors that you have circled in blue and it's working!!!!
I've got one question: When I turn on my computer the monitor starts with "no signal". I am getting signal when i have to fill in my password so i don't see my bios etc. I am using the dvi cable and windows 7 at 1920x1200.

Thanks very much for the advice everyone who helped me.

[PlainBill]

Re: ACER AL2423W - no display

I have been searching and when i put an external power at the three 19V pins at the connector of the inverter board and i turn on the power of the monitor the same time the backlight goes on and stays on even when i put away the external power. If iI turn the monitor off and turn it on the backlight stays off. I think its like a sort off current limiter.
I hope you understand it because my english is not so good.

Your English is more than adequate.

I believe you are correct. The area around the 19 Volt rectifier looks very unhealthy. This is also a very interesting design; I have never seen one of these with THREE transformers, and three smps controllers.

I've marked up the top view of the power board. Check the value of the two resistors circled in red. They appear to be discolored, and could be the cause of the overheating. I have circled 5 capacitors in blue. One or two of those filters the supply for the 19V / 12V SMPS controller. If those are bad it MIGHT cause the problem you are seeing. And it is also possible the 19Volt rectifier (also circled in red) is defective. You could try replacing that.

PlainBill

[tonnes]

Re: ACER AL2423W - no display

I have been searching and when i put an external power at the three 19V pins at the connector of the inverter board and i turn on the power of the monitor the same time the backlight goes on and stays on even when i put away the external power. If iI turn the monitor off and turn it on the backlight stays off. I think its like a sort off current limiter.
I hope you understand it because my english is not so good.

[PlainBill]

Re: ACER AL2423W - no display

I have switch the powerboard with another one and the monitor works. The problem is that i can't keep the powerboard so i want to repair it.

Post top and bottom pictures of the power board. If you still have the good one, measure the same points on the connector to the inverter.

PlainBill

[tonnes]

Re: ACER AL2423W - no display

I have switch the powerboard with another one and the monitor works. The problem is that i can't keep the powerboard so i want to repair it.

[dondrusco]

Re: ACER AL2423W - no display

Check that three fuses (I think) - circled in red.

One of them is blown, probably.

[tonnes]

Re: ACER AL2423W - no display

These are the pictures of the inverterboard.

[dondrusco]

Re: ACER AL2423W - no display

Post a picture of inverter board top/bottom.

[tonnes]

Re: ACER AL2423W - no display

When its connected to the computer the led stays green.
Al the fuses are oke.

The connector to the inverter board:
Bl = 0V
Gr=0V
Ye= 19,8V
Or=19,8V
Rd=19,8V
Br=0,5V
Bl=3V

[Bobdee]

Re: ACER AL2423W - no display

Hello Tonnes
Also can you tell us what happens when its connected to computer
There are usually 3 fuses on these p/s boards, the inverter one needs checking out
Bob

[dondrusco]

Re: ACER AL2423W - no display

Welcome, Tonnes!

If power led goes from green to orange - it means that power supply and main board controller are probably OK.

There are two possibilities.

1, Bad inverter - connect the monitor to computer and check display with lamp, if you are able to see any image on it.
If it is OK, disconnect inverter board and check voltages at connector to inverter. Probably 20V branch has some troubles - cold joint. Resolder joints under all chokes


2, inverter OK, but no signal to panel - you are able to see backlight lite, but no display appears. Then goes down with orange power led.
Check LVDS connector to panel, if it is not displaced.

[tonnes]

Re: ACER AL2423W - no display

Hello i am Tonnes and this is my thirst post.
I've got an al2423w with no backlight. The backlight board is oke. I have changed the capacitors cs 10,11,12,13,14,15 and 16 on the powerboard but no result.
The power led goes on and after some time to orange (with no computer on it). It's a fsp112-3f01 powerboard and a the mainboard is the same as the picture of Dondrusco.
Maybe someone can help me.

[dondrusco]

Re: ACER AL2423W - no display

I received another Acer - AL2023.
There were real disaster inside. Both boards have bulged capacitors.
The power board 9 and main board 8.

Power board:
3x470uF/35V
2x470uF/25V
2x1000uF/16V
1x470uF/16V
1x220uF/25V

Main board
7x330uF/16V (I haven't got 330uF- i have used 470uF)
1x100uF/25V

I replaced them, and now it works.