acer al1916w going bad

[retiredcaps]

Re: acer al1916w going bad

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

1) For all your readings, momaka's #1 applies here.

https://www.badcaps.net/forum/showpo...26&postcount=5

2) All your mosfets are shorted gate to source.

[1supertech]

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..

Pic other side top view

[sabre504]

Re: acer al1916w going bad

Bottom row Top row
1 aol+ - aol-
2 aor+ - aor-
3 shut - mute
4 v adj - +13.8v
5 +5v - +5v
6 det - gnd
7 gnd - gnd
8 eva - Adj

F102 is beneath this connector and should be marked w

[1supertech]

Re: acer al1916w going bad

1) For all your readings, momaka's #1 applies here.

https://www.badcaps.net/forum/showpo...26&postcount=5

2) All your mosfets are shorted gate to source.

What do you think made them short out age or bad soldering job

should the f200 fuse protect that side of inverter board?

[1supertech]

Re: acer al1916w going bad

Bottom row Top row
1 aol+ - aol-
2 aor+ - aor-
3 shut - mute
4 v adj - +13.8v
5 +5v - +5v
6 det - gnd
7 gnd - gnd
8 eva - Adj

F102 is beneath this connector and should be marked w

By connector do you mean power connector? I looked all over for a W
I know what your saying I have ssen this fuse in one of my ebooks.

[Rtech]

Re: acer al1916w going bad

Looks like the mosfets need sorting then,before anything else.

[1supertech]

Re: acer al1916w going bad

Looks like the mosfets need sorting then,before anything else.

Will order mosfets today
What do you think shorted them out?

[sabre504]

Re: acer al1916w going bad

Circled in yellow

[1supertech]

Re: acer al1916w going bad

Circled in yellow

What is circled in yellow I see black lines

[selldoor]

Re: acer al1916w going bad

Hi - he has marked where the fuse is with a yellow oblong.
Left hand side half way down just to the right of the connector
it is a small black fuse with a white w on it.

I believe the Mosfets fail because of fluctuating voltages often due to
bad caps - you should replace all the caps on the power supply with
good make ones - panasonic fm or fc.

[1supertech]

Re: acer al1916w going bad

Hi - he has marked where the fuse is with a yellow oblong.
Left hand side half way down just to the right of the connector
it is a small black fuse with a white w on it.

I believe the Mosfets fail because of fluctuating voltages often due to
bad caps - you should replace all the caps on the power supply with
good make ones - panasonic fm or fc.

I don't believe I missed that yellow square need glasses but any way

I ordered a repair kit from ebay
http://www.ebay.com/itm/DAC-12M030-R...-/320634046613

but as far as that fuse I still can't find it
here is the pic of my board looking at the same direction as the other pic that Sabre sent

[Rtech]

Re: acer al1916w going bad

Just goes to show why members ask for photos of Boards as the differences can be many.These mosfets fail whether Caps are good or bad, they just seem not to stay the distance.But change the caps anyway, and hopefully that will out you back in business for a long time.

[1supertech]

Re: acer al1916w going bad

Thanks to all
I will update when my parts come in

[1supertech]

Re: acer al1916w going bad

Thanks to all
I will update when my parts come in

Update I received all my parts recapped board all new transformer Mosfet.
Turned it on and no image did flash light test I have an image. I think we are progressing

Did a continuity test on inverter transformers on primary side top one is 0.752
bottom one 0.000 Hope did this right.

Another problem is that the original owner of this monitor burned this spot where capacitor joint is can this be fixed.

[selldoor]

Re: acer al1916w going bad

Hi Not sure about your test - can you post the numbers off the sides of the transformers and a picture of the underside of your board might help.
The solder/trace damage is repairable. Looks like it may be just solerable or it just needs a wire to connect the trace then solder the cap leg to the wire.
Youd need to check first that that is where the trace went - will be easier
looking at the actual board.

[1supertech]

Re: acer al1916w going bad

Hi Not sure about your test - can you post the numbers off the sides of the transformers and a picture of the underside of your board might help.
The solder/trace damage is repairable. Looks like it may be just solerable or it just needs a wire to connect the trace then solder the cap leg to the wire.
Youd need to check first that that is where the trace went - will be easier
looking at the actual board.

Inverter transformer # both are 2904761000

[selldoor]

Re: acer al1916w going bad

Hi - no hits on that number. I have looked at the partial
board picure but its not on there. However if you look
at the top left it looks loke a cap may have been soldered in. -The joint on the right doesnt look great (sorry if you did it) but there is also mark/damage to the trace between the legs. It may be just shadow or flux but you can check its not connecting to the left leg of the cap.

Good I will look at the picture now added - thanks

[1supertech]

Re: acer al1916w going bad

Thanks yes I did it shame on me will fix that
thanks selldoor

[selldoor]

Re: acer al1916w going bad

No shame - we have all been there. - May have to hold your hand up to more.
I attach a pic marked with some dodgy bits - may be ok- just for you to check.
Recommend looking over it all with a magnifying glass.

Couldnt tell for certain which were the secondary windings on the transformers - I see the 4 posts have been marked. You will need to number
the posts 1 to9 or whatever then with meter on ohms2000 check pin 1>2
1>3 1>4 ........2>3 3>4...... etc etc and compare the two transformers.
Primary is usually 3-6 ohms will read 0.00 in tet and secondaries 400-1500ohms.

[1supertech]

Re: acer al1916w going bad

Hi - no hits on that number. I have looked at the partial
board picure but its not on there. However if you look
at the top left it looks loke a cap may have been soldered in. -The joint on the right doesnt look great (sorry if you did it) but there is also mark/damage to the trace between the legs. It may be just shadow or flux but you can check its not connecting to the left leg of the cap.

Good I will look at the picture now added - thanks

I fixed my soldering mistakes and fixed the bad trace to the cap by soldering a wire to cap leg it works it fired up