acer al1916w (with pics)

[motoxer]

3 black caps look bad. should i replace all of them (including the smaller brown ones?)
the big cap looks ok, and i guess generally isnt replaced?

also have seen lots of "smps" chips / TEA1532 on other acer monitors go bad. my monitor doesnt seem to have one of these. I see "dap8a" 8 pin, and "bit3713" 14 pin chips and not sure what they are exactly.

power board says
dac-19m005
DA2BF


monitor issues:
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.

[budm]

Re: acer al1916w (with pics)

This board is known to have bad caps and also will take out the fuse for the Inverter circuits and take out the MOSFET's (3-pin device with metal tab). So check them.

[jetadm123]

Re: acer al1916w (with pics)

dap8a is a ncp1203d6 pwm controller.

[motoxer]

Re: acer al1916w (with pics)

This board is known to have bad caps and also will take out the fuse for the Inverter circuits and take out the MOSFET's (3-pin device with metal tab). So check them.

testing mosfets is basically out of my league. is it possible to test them without removing them, with a multimeter?

i found a few places talking about how to do it, but nothing for dummies.
the way where you charge it up with a multimeter and then short 2 pins made sense, but you have to remove it for this way?



also, my monitor does work after it "warms up," i'm assuming that means the fuses are ok

[budm]

Re: acer al1916w (with pics)

You can measure it in the circuits, set the Ohm meter to 200 Ohm range, label pin as 1, 2, 3. (tab away from you, legs point toward you).
Measure
1-2
1-3
2-3

No power to the monitor, of course.
You know how to solder and read diagram?
I would replace all 7 caps all grouped together by the heatsink.

[motoxer]

Re: acer al1916w (with pics)

You can measure it in the circuits, set the Ohm meter to 200 Ohm range, label pin as 1, 2, 3. (tab away from you, legs point toward you).
Measure
1-2
1-3
2-3

No power to the monitor, of course.
You know how to solder and read diagram?
I would replace all 7 caps all grouped together by the heatsink.

I'll get a read on the mosfets in a bit. What ohm reading makes them bad, and what if 200 ohms isnt a high enough number to read them?

I can solder basic stuff, though more used to doing wires.

I can probably match up numbers on a diagram, dunno how well i would be at the 50 step diagnosis/volt/ohm checking though but willing to give it a shot if it comes to it.

[motoxer]

Re: acer al1916w (with pics)

mosfets with multi on 200

mosfet, pin ohms
a, b = maxed out on 200 all 3 pins (upper right corner)
1-2 1-3 2-3
c = 128.5, 0.1, max
d = 125.7, 0.1, max (both of these bottom right corner near the bad caps)

e= maxed out on 200 all 3 pins (bottom left corner)

trying to measure the ones that maxed out @ 200ohms lead into the 20k-20m range slowly rising.

mosfet a, b = 40t03gp
mosfet c = sbt100
mosfet d = sbt150
mosfet e = p6nk602fp


fuse i only used the continuity tester and im not sure which pins to use. it beeped on 2 different pins on the back with the other lead on the fuse. not sure if i'm supposed to be looking at volts or what pins

[budm]

Re: acer al1916w (with pics)

I forget to tell you that the two MOSFETS for the inverter are the two that laying down flat on the board with white glue holding them down. Are they the one that show max out on 200 scale on the meter?
I try to upload the SCH for the board, 2.3Mb, but I keep getting failed error!

[motoxer]

Re: acer al1916w (with pics)

I forget to tell you that the two MOSFETS for the inverter are the two that laying down flat on the board with white glue holding them down. Are they the one that show max out on 200 scale on the meter?

yep, all pin combos on both

[budm]

Re: acer al1916w (with pics)

Good you are OK. So I would order a good set of caps, PANASONIC FM (I prefer), or FC series from Digikey.

[motoxer]

Re: acer al1916w (with pics)

Good you are OK. So I would order a good set of caps, PANASONIC FM (I prefer), or FC series from Digikey.

thanks for the help.

I plan on ordering tomorrow. 6 of the black caps and the "sideways" brown one unless it isnt needed? what about the 2 small brown ones in the bottom middle of the first attach?

[budm]

Re: acer al1916w (with pics)

Those are for the primary side, I would say g ahead and replace them also so you will not have to do them in the future. When you get the caps, replace the 7 pieces (yes, the one that laid down on the side also) first and see if the monitor will function. The other two later.