ACER AL2423W - no display

[JustRob]

Re: ACER AL2423W - no display

If you have a multimeter, measure the connector between the logic board and the power board.

List the pins and and all the measurements you find.

Thanks, looks like 12V rail is dead. 5V is present (but only used for logic). I assume the 12V is used for the DC/DC fluorescent back-lighting. Can the PSU be operated safely without any load on 5V or 12V? Some PSUs are unstable in this mode, I just don't know if this is one of them!

[retiredcaps]

Re: ACER AL2423W - no display

No bulging caps. Symptoms are that when I turn the power switch on, the green LED power light goes on and out quickly. It could be some kind of power supply watchdog to ensure all rails are present (and power off if not), or something else altogether.

If you have a multimeter, measure the connector between the logic board and the power board.

List the pins and and all the measurements you find.

[JustRob]

Re: ACER AL2423W - no display

CleanSC: I accidentally ripped the wires out of the 1x4 header for the speaker output. Could you kindly zoom in on one of your pictures around the connector? Thanks!

My monitor just died recently (same model). ACER repaired it in January 2010, and they said they replaced the Power Supply. Now it is out-of-warranty. No bulging caps. Symptoms are that when I turn the power switch on, the green LED power light goes on and out quickly. It could be some kind of power supply watchdog to ensure all rails are present (and power off if not), or something else altogether. Were you able to operate the PSU without the CPU board attached? It appears that the uppermost two pins of the interconnect pins appear to be a way for the CPU board to power the power supply off (says ON/OFF) and another says BR ADJ (?).

Thanks!

[PlainBill]

Re: ACER AL2423W - no display

Garbage in, garbage out.

Do it yourself.

PlainBill

[steveiott06]

Re: ACER AL2423W - no display

Back in post#64 you listed the caps as:


so it seems YOU mis-typed ....

I sure did.

[pedro]

Re: ACER AL2423W - no display

Thanks for the quick reply, except I have a few differences...

The 680uf is a 25v, not a 16v like you have listed. And also, my 1000uf is a 16v, not a 25v like you have listed.

I am just curious is they are actually different, or if you mis-typed. Thanks.

Back in post#64 you listed the caps as:

I need these sizes;

100uf 16v
1000uf 25v
680uf 16v

so it seems YOU mis-typed ....

[steveiott06]

Re: ACER AL2423W - no display

You are omitting two important values - diameter and height. It is embarrassing if a replacement cap won't fit into the available space.

100uf 16v EEU-FC1C101 6.3mm x 11.2 mm

1000uf 25v EEU-FM1E102 12.5mm x 20 mm OR EEU-FC1E102 is available in 3 D / H combinations

680uf 16v EEU-FM1C681 10 mm x 16 mm

I choose these parts from Digikey. Compared to Mouser, Digikey often has higher prices for components, but offers First Class Mail as a shipping option so a small order may cost less and arrive sooner. Both are excellent suppliers.

PlainBill

Thanks for the quick reply, except I have a few differences...

The 680uf is a 25v, not a 16v like you have listed. And also, my 1000uf is a 16v, not a 25v like you have listed.

I am just curious is they are actually different, or if you mis-typed. Thanks.

[PlainBill]

Re: ACER AL2423W - no display

Hello,

I simply can't understand what replacement capacitors I need. Could someone help?

I am using the www.mouser.com website and I need these sizes;

100uf 16v
1000uf 25v
680uf 16v


Thank you for your help!

You are omitting two important values - diameter and height. It is embarrassing if a replacement cap won't fit into the available space.

100uf 16v EEU-FC1C101 6.3mm x 11.2 mm

1000uf 25v EEU-FM1E102 12.5mm x 20 mm OR EEU-FC1E102 is available in 3 D / H combinations

680uf 16v EEU-FM1C681 10 mm x 16 mm

I choose these parts from Digikey. Compared to Mouser, Digikey often has higher prices for components, but offers First Class Mail as a shipping option so a small order may cost less and arrive sooner. Both are excellent suppliers.

PlainBill

[steveiott06]

Re: ACER AL2423W - no display

Hello,

I simply can't understand what replacement capacitors I need. Could someone help?

I am using the www.mouser.com website and I need these sizes;

100uf 16v
1000uf 25v
680uf 16v


Thank you for your help!

[steveiott06]

Re: ACER AL2423W - no display

CS10,11,12,14,15 all are bulged at the top. I have found a replacement on the Mouser website, but there are too many for me to know exactly what I need, can you help. here is that I found so far.

http://www.mouser.com/ProductDetail/...cT1Z0S7DcKY%3d


I also have some dis-colorization around the BS3, do you think this should be replaced as well? I found this for a replacement, but says it could take 15 weeks to get in stock.

[PlainBill]

Re: ACER AL2423W - no display

USA, Michigan

I tried a search with no luck, not sure what to search for. Thanks.

Let's see, where would I look for the answer to a question that has been asked many times? Maybe in the FAQ!!!

Note the links in my signature.

PlainBill

[steveiott06]

Re: ACER AL2423W - no display

Might help to know what part of the planet you're on.

Also, a search will find it's been covered a few times.

USA, Michigan

I tried a search with no luck, not sure what to search for. Thanks.

[smason]

Re: ACER AL2423W - no display

I have a 24" Acer with the exact problem. I tore it apart and seems the capacitors are blown and need replaced. Can someone point me to a good website for ordering replacement capacitors for these monitors? Thanks!

Might help to know what part of the planet you're on.

Also, a search will find it's been covered a few times.

[steveiott06]

Re: ACER AL2423W - no display

I have a 24" Acer with the exact problem. I tore it apart and seems the capacitors are blown and need replaced. Can someone point me to a good website for ordering replacement capacitors for these monitors? Thanks!

[jetadm123]

Re: ACER AL2423W - no display

I have the same problem with the green light going to orange and back to green when I plug in a video source. I replaced all the caps and still no video. Can not even get into setup mode on monitor.

How do you test the fuse. Do you have to remove them?

You can test the fuse(s) in circuit. Set your meter on ohms (resistance setting) and with the monitor unplugged, touch the black probe to one end of the fuse and the red probe to the other end. Resistance should read 0.3 ohms or less.

I suggest you start a new thread with new photos (see link below) because this thread is getting too crowded.


https://www.badcaps.net/forum/showthread.php?t=1868

[dnwong]

Re: ACER AL2423W - no display

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

One of them is blown, probably.

I have the same problem with the green light going to orange and back to green when I plug in a video source. I replaced all the caps and still no video. Can not even get into setup mode on monitor.

How do you test the fuse. Do you have to remove them?

[blowing_in_the_watts]

Re: ACER AL2423W - no display

hooray, another monitor that can use my junked compnents from an acer x241w

same prob, blown capacitors
also a blown fuse on the backlight inverter

replaced the bad caps on the controller board (vga) the capXcon and taepo on the power board, and the 3 bad capacitors and the fuse on the backlight inverter

however after all this fun still no backlight when i fixed it all together

as i was getting a flashlight the backlight inverter sparked and flamed up a U chip


ok so no backlight let me explain, when the vga was not plugged in the green light went orange (no signal)
when the vga was plugged it in stayed green constantly

i tested with a MM the pin outputs to the backlight inverter it was getting constant voltage


i also cant find the xad306lr board anywhere except old ebay links and a few sites in poland (.pl)


...anyone want a power board and controller board?!!


cheap faulty capacitors in high temp high voltage circuitry is sadness

[dondrusco]

Re: ACER AL2423W - no display

I have repaired another one - but this one had bulged caps on control board.
No signal issue.
It worked for one week. But it stopped working unexpectedly. 10 seconds to turn off backlight. There were too hot - about 30 degrees of Celsius. It worked OK after cool down.
I found another bulged capacitor on backlight board. There were not standard capacitors - 180uF/30V. I have raplaced all three - 220uF/35V ones were used.

[dondrusco]

Re: ACER AL2423W - no display

There is one thread, where the same problem is discussed.
https://www.badcaps.net/forum/showth...07835#poststop

[freddyfena]

Re: ACER AL2423W - no display

That is because I removed and put the transformer back, I and have not cleaned or tried to make it look nice ;-)