Acer AL-2416w dead.

[froggy]

Hi,Firstly id better start off by saying im new to the electronics world so please be patient with me, anyhow ive just inherited the above mentioned monitor from a friend, he was told that it was the main board (logic board) that maybe at fault but never had it confirmed,
There is no amber or green light illuminating on the power switch, have had a look over the powerboard & all caps look o,k (including under the alloy plate) & have read somewhere that they are quite robust units,
But seeing as the small pcb that has the on/off & adjustment switches mounted on it goes to the logic board would the diagnosis of the logic board being faulty be a correct one?, if so is there a common cause of failure in this unit (VL-2402 rev:1),
Thanks in advance. (sorry if this is a bit vague).

[retiredcaps]

Re: Acer AL-2416w dead.

1) Start by posting clear focused pictures using the manage attachments button below the text area. Do NOT post pictures inline or offsite.

We want picture as close to 2000x2000 and like this.

https://www.badcaps.net/forum/showpo...94&postcount=1

2) Do you have a multimeter?

[froggy]

Re: Acer AL-2416w dead.

Thanks for your prompt reply, yes i do have a multimeter (quite a few!), i inherited my late fathers testing equipment & draws of components, im kicking myself for selling the ESR meter as that would now be rather handy right now,
anyhow i`ll try & take a photo soon although my camera isnt that brilliant!.

[retiredcaps]

Re: Acer AL-2416w dead.

See if there are secondary DC voltages on the connector between the power and logic board. If they all read 0.0V DC, then carefully measure the DC voltage across the large capacitor. If you are North America, it should be mains x 1.414 or roughly 165V DC.

[froggy]

Re: Acer AL-2416w dead.

O,k ive taken a few photos but as i said my camera isnt that good on macro.

[froggy]

Re: Acer AL-2416w dead.

See if there are secondary DC voltages on the connector between the power and logic board. If they all read 0.0V DC, then carefully measure the DC voltage across the large capacitor. If you are North America, it should be mains x 1.414 or roughly 165V DC.

Im actually in the UK so any idea what reading i should expect?, Also should i do this with the logic board fully connected up or just the connector from the P/B.,,,,thanks.

[retiredcaps]

Re: Acer AL-2416w dead.

Im actually in the UK

The logic board is likely to be 24V DC or less. It is typically 5V DC. Test with all your boards connected.

UK = 220V or so. So 220 x 1.414 = 310V DC across the big capacitor. CAREFUL, this is high voltage here.

We also need a picture of your power board.

[sabre504]

Re: Acer AL-2416w dead.

Hi sorry to correct but UK = 240v ac so 336 -339 DC at the main cap

[jetadm123]

Re: Acer AL-2416w dead.

You should also post some photos of the entire top and bottom of your power board.

[froggy]

Re: Acer AL-2416w dead.

O.k, ive now had a chance to go through this properly & found the reason for no power was due to some clown (not me) had bent a pin on the switch panel PCB, Having now corrected that we have signs of life!,
Have connected it up to my laptop & with a bright light can see that the display is working,
So the problem seems to be nothing more than no backlights,When powering the monitor up i dont get as much as a flash from them, I havent gone any further as im hoping someone can point me to the culprit, Seeing as the inverter PCB connects direct from the secondary side of the P/B am i correct in assuming its something on the P/B & not the logic board?,
Anyhow here is a couple of pictures of the P/B & as they say in all corny spy movies,,"i await further instructions"

[alexanna]

Re: Acer AL-2416w dead.

^
There is a fuse on the inverter, you should check it.
Dose anything on the inverter look like it's been hot or damaged?
If the fuse is good and you notice no damage, I would replace the 35v capacitors on the inverter

[froggy]

Re: Acer AL-2416w dead.

^
There is a fuse on the inverter, you should check it.
Dose anything on the inverter look like it's been hot or damaged?
If the fuse is good and you notice no damage, I would replace the 35v capacitors on the inverter

Ive found 3 fuses (F1-F3) & F1 is showing no continuity, As there is no markings on these things do you know what value it should be?,,,many thanks.

[alexanna]

Re: Acer AL-2416w dead.

Ive found 3 fuses (F1-F3) & F1 is showing no continuity, As there is no markings on these things do you know what value it should be?,,,many thanks.

Have you tried searching other threads on this monitor? I may be confused but it think someone in another thread came up with the answer.

[froggy]

Re: Acer AL-2416w dead.

I havent searched through as yet as I thought id let you know my findings first, i`ll have a dig around the other posts now.,,,,many thanks.

[jetadm123]

Re: Acer AL-2416w dead.

Ive found 3 fuses (F1-F3) & F1 is showing no continuity, As there is no markings on these things do you know what value it should be?,,,many thanks.

The inverter is a problem with this model monitor. Usually, the caps go bad causing one or more of the mosfets to short, which blows the fuse. Unusual that all 3 fuses went bad. Please post a photo of the inverter board.

[froggy]

Re: Acer AL-2416w dead.

The inverter is a problem with this model monitor. Usually, the caps go bad causing one or more of the mosfets to short, which blows the fuse. Unusual that all 3 fuses went bad. Please post a photo of the inverter board.

Ive just been hunting the forum & found the thread on these inverter boards, Although my fault is slightly different as in i dont get the 2 second "ACER" logo,
I think you may have mis-read my previous post as only F1 appears to be U/S,
The caps all look fine to me with no bulges etc so is the next test the 14 pin connector?. as ive found on another post this is the way to go & will obviously confirm power & voltages to the inverter board.....many thanks.

[jetadm123]

Re: Acer AL-2416w dead.

Oops! I did misread your post. If F1 is blown, them check Q3,Q4,Q5 and Q6 (assuming you have the same inverter board) for shorts. Additionally, caps don't have to bulge to be bad.

[froggy]

Re: Acer AL-2416w dead.

Ive just checked the 14 pin connector & checks out as it should, ive re-checked the fuses with DMM set at 200ohms (as mentioned on other post) & F1 is showing zero, I couldnt find the value of the fuse on the other thread so i really could do with some suggestions on what it could be as well as what to check next.,,,,cheers.

[froggy]

Re: Acer AL-2416w dead.

Oops! I did misread your post. If F1 is blown, them check Q3,Q4,Q5 and Q6 (assuming you have the same inverter board) for shorts. Additionally, caps don't have to bulge to be bad.

Being a bit of a novice to all this where will i find Q3 to Q6 & how do i test them?.....thanks for your patience!

[alexanna]

Re: Acer AL-2416w dead.

see if the inverter is the same in this thread,the second to last post shows what amp fuse was used
https://www.badcaps.net/forum/showth...highlight=2416