acer al1916w going bad

[motoxer]

Monitor recently started repeating the logo screen and not showing the desktop. After 5 minutes or so of doing this, then it will turn on and work normally.

A few days later, it would repeat the logo for a while and then the power light would go orange and fade in color and the monitor would go black. I could unplug and plug back in the power, then it would repeat the logo screen and work (eventually.)

Keeps taking longer and longer to turn on, but once it's on it stays on...


Is this bad caps, or something else? It's an acer al1916w from march 2008.

[selldoor]

Re: acer al1916w going bad

Hi - welcome to the forum. I dont know how much research you have done but
if you type AL1916w into "Search" above, you may find an answer. If not you will see how to post pictures of the inside of your monitor and give you an idea of what is involved. Say if you have a multimeter and soldering tools and if you can use them and an indication of what electronic knowledge you have.

[retiredcaps]

Re: acer al1916w going bad

Keeps taking longer and longer to turn on, but once it's on it stays on...

Is this bad caps, or something else?

Yes, it could be bad caps. As caps warm up their ESR drops and allows the circuit to work.

[motoxer]

Re: acer al1916w going bad

Hi - welcome to the forum. I dont know how much research you have done but
if you type AL1916w into "Search" above, you may find an answer. If not you will see how to post pictures of the inside of your monitor and give you an idea of what is involved. Say if you have a multimeter and soldering tools and if you can use them and an indication of what electronic knowledge you have.

I looked some but most seemed to be monitors that didnt work at all, and got really confused with all of the comments saying it could use different power circuit boards etc.
I'm still using the monitor and hoping for a quick fix before things go worse...

Yes, it could be bad caps. As caps warm up their ESR drops and allows the circuit to work.

thanks for the reply. i'm hoping it's just that and not something else



I have a multimeter and soldering iron but neither are great quality. I'm hoping to just replace the normal caps and hope that it fixes it.

I'm guessing it's better to open up the monitor first and look for damage before ordering?

And, are ebay repair kits "bad" ?

[retiredcaps]

Re: acer al1916w going bad

I'm guessing it's better to open up the monitor first and look for damage before ordering?

Yes.

And, are ebay repair kits "bad" ?

If you DIY using digikey with USPS 1st class shipping versus a "kit: you are likely to save 1/2 the cost.

[sabre504]

Re: acer al1916w going bad

Thisa may be a bit early to mention but if your monitor uses this video board (see picture )
The volt regulator at U7 (circled red ) can start to fail causing the same symptoms and when failed can cause no start up.
Follow Retiredcaps and others advice and start with the PSU first though

[1supertech]

Re: acer al1916w going bad

Thisa may be a bit early to mention but if your monitor uses this video board (see picture )
The volt regulator at U7 (circled red ) can start to fail causing the same symptoms and when failed can cause no start up.
Follow Retiredcaps and others advice and start with the PSU first though

Hello wonderful people can solve my electronic problem I am a new to the electronic stuff. I purchased a AL1916w that will not start up I upon looking inside I noticed previous owner tried to fix it by replacing two capacitors 1000uf 25v with wrong heat range 85c. Soldering was very bad, after reordering with new caps I get blue light on start then goes yellow. 2 Fuses test good caps test with good esr’s I get 165 volts coming out of Big cap I get power to main board 12v & 5v

I also plugged in my CCFL test bulbs no power to bulbs on start.

I have the same mainboard as the picture above with two LDO regulators AMC1117 3.3
The same regulator that is squared of in red in the pic above my voltage readings are
Ground 0000
Out 3.284
In 0.476
I am assuming this is bad ?

The other regulator on the far right corner reads

Ground 0000
Out 3.283
In 05.02

[selldoor]

Re: acer al1916w going bad

@1 supertech - we need pictures of YOUR boards its no good us looking at someone elses. If both LDO s are 3.3v then 3.284/3 reduction may be due to poor caps nearby is not far off - Your voltages 12v and 5v seem very exact - best to quote to 2 decimals
Was it all connected up when you took voltages.

[Rtech]

Re: acer al1916w going bad

"I have the same mainboard as the picture above with two LDO regulators AMC1117 3.3
The same regulator that is squared of in red in the pic above my voltage readings are
Ground 0000
Out 3.284
In 0.476
I am assuming this is bad ?"

Check the voltages again on this, I doubt if you can get 3.284 volts out,,with only 0.476volts going in !!!!!!!

[jetadm123]

Re: acer al1916w going bad

Which 2 fuses did you check? Assuming you have a DAC-19M008 power board, a common failure for this board is one of the AOP605 dual mosfets shorting out and causuing fuse F200 to open. Check F200 first.

[1supertech]

Re: acer al1916w going bad

@1 supertech - we need pictures of YOUR boards its no good us looking at someone elses. If both LDO s are 3.3v then 3.284/3 reduction may be due to poor caps nearby is not far off - Your voltages 12v and 5v seem very exact - best to quote to 2 decimals
Was it all connected up when you took voltages.

It was all connected I will give you a more exact reading starting where
powerboard meets mainboard at top

2.711
000.1
000.1
05.02
12.01
05.02
0.540 but fluctuates
000.4

[1supertech]

Re: acer al1916w going bad

Which 2 fuses did you check? Assuming you have a DAC-19M008 power board, a common failure for this board is one of the AOP605 dual mosfets shorting out and causuing fuse F200 to open. Check F200 first.

No It's a dac 12M030

Round fuse behind power plug on power board and glass fuse near heatsink

I was wondering about the AOP605 how do you test them

[1supertech]

Re: acer al1916w going bad

"I have the same mainboard as the picture above with two LDO regulators AMC1117 3.3
The same regulator that is squared of in red in the pic above my voltage readings are
Ground 0000
Out 3.284
In 0.476
I am assuming this is bad ?"

Check the voltages again on this, I doubt if you can get 3.284 volts out,,with only 0.476volts going in !!!!!!!

I tried it again and got the same reading

[jetadm123]

Re: acer al1916w going bad

No It's a dac 12M030

Round fuse behind power plug on power board and glass fuse near heatsink

I was wondering about the AOP605 how do you test them

I believe for this power board, there's a surface mount fuse, F102, on the bottom of the board. Check to see if it's open.

Download the spec sheet for the AOP605. There are two mosfets in the AOP605. With your meter set to 200 ohms resistance:

For mosfet 1, measure across

D1-->G1
G1-->S1
D1-->S1


For mosfet 2, measure across

D2-->G2
G2-->S2
D2-->S2

A reading of approx 0-30 ohms will indicate a short. Perform this test for all 4 of the AOP605's.

[retiredcaps]

Re: acer al1916w going bad

The same regulator that is squared of in red in the pic above my voltage readings are
Ground 0000
Out 3.284
In 0.476
I am assuming this is bad ?

What pins are you calling ground, in, and out?

[Rtech]

Re: acer al1916w going bad

You can prove if the Power Supply/Inverter is working, as follows....Plug in you tests lamps,power up from the mains the power supply board ONLY,and apply 3v DC( from a couple of batteries maybe),beteween the BL ON pin and a Ground pin on the connector that would normally go to the Logic Board.This will indicate where you go next.

[1supertech]

Re: acer al1916w going bad

What pins are you calling ground, in, and out?

Ground frist pin on left
Out is center pin
In is frist on right

[Rtech]

Re: acer al1916w going bad

Then there is someting wrong,Its not possible for a 3.3v LDO to give that voltage out with only approx 0.5 volts in...you have to have more in than you get out, and normally the input for the 3.3v regulator woul be approx 5 volts.However I suspect this is a 'red Herring', and should be put aside until you can get the PSU/Inverter working.Suggest you do the test as I suggested,and the resistance readings jetadm123 requested.

[1supertech]

Re: acer al1916w going bad

You can prove if the Power Supply/Inverter is working, as follows....Plug in you tests lamps,power up from the mains the power supply board ONLY,and apply 3v DC( from a couple of batteries maybe),beteween the BL ON pin and a Ground pin on the connector that would normally go to the Logic Board.This will indicate where you go next.

I don't see BL on pin on power supply that connect to Logic board

Tested all capacitors at 0.10 thru 0.25 on esr meter should I try replacing all anyway ?

fuses
f101 reads 000.0
f200 reads 000.0

suface mount fuse behind power plug is F101 don't see 102


I tested Mosfet’s

Top Mosfet 1

D1-->G1 -08.76
G1-->S1 -000.0
D1-->S1 -08.81


Mosfet 2

D1-->G1-08.84
G1-->S1- 000.0
D1-->S1- 08.74

Mosfet 3
D1-->G1 08.68
G1-->S1 000.0
D1-->S1 08.28


Mosfet 4
D1-->G1 08.65
G1-->S1 000.0
D1-->S1 08.67

[Rtech]

Re: acer al1916w going bad

The photo shows one line of pins,what about the other line,are they not marked ?? or is every pin in the top line connected to the pin immedoately below it...suggest some will be eg the Ground,it may be the DET pin,BUT check what the other ones are supposed to be..