No power on a Acer AL1916

[PlainBill]

Re: No power on a Acer AL1916

Hi, I recently found two free non-working LCD monitors on craigslist. Both have the same issue, No power. The LED on the power button does not light up at all and pressing it does nothing. I have tried different cords and different outlets and it doesn't make a difference.
When I opened up the monitor all of the caps on the power supply look good but there is a brown spot on both boards in the same area. I don't really know where to go from here. I have a multimeter and have replaced components on a board before.
I would be willing to do a mod like this http://computerguru365.blogspot.com/...l-monitor.html if I could have a little help on where the wires should go.

Thanks!

Pictures attached

That isn't a mod, that's an abomination. I'm a technician, not an axe murderer. Would you be proud driving a car like the one in the picture?

Nice pictures. Take a look at this thread. Look familiar? Between the two of you there are three identical power supply boards.

I've marked up a picture from the other thread. Put one of the boards back into the monitor and fasten it in place with at least two screws, one of which should be to one closest to the connector that leads to the logic board. Hook up all the wires, but don't put on any shields. Be careful not to touch any point on the board while it is hooked up to AC power.

Near the AC power connector is a large capacitor. Note that there are red and black circles at the leads. Set your DMM to the highest DC scale, plug the monitor in and touch the red lead of the DMM to the lead circled in red, and the black lead to the lead circled in black. The meter should show a voltage that is 1.4 times your AC voltage. In the US it would display about 165 volts. If that is what you see, the AC input components are good.

Now let's see if the DC output of the power supply is good. Reset your DMM to the 20 volt DC scale. Hold the black lead of the DMM to the screw in the upper right corner (blue dot). Now probe each pin of the connector, starting at the top one and record the voltages. List them in your next post.

PlainBill

[RobertoIsRad]

Re: No power on a Acer AL1916

Unfortunately, both boards read 0 ohms so I'm going to assume that the fuses are ok. Could the problem be in the mainboard? I just assumed because of the lack of power that it was the power supply

[etnietering]

Re: No power on a Acer AL1916

Well, since you get absolutely not response from them, my guess would be the fuses are blown. They're the little red box next to where the AC power comes in. To check them, set your multimeter for the lowest resistance rating and measure across the leads. If the fuse is good, it will read 0 ohms, if the fuse is blown it will read infinity/overload. If the fuse is good then the problem lies elsewhere. If the fuse is bad, that's why nothing is happening, but chances are something else has gone bad too, and caused the fuses to blow. There are many other people here who know way more about monitors than me, but that's a place to start at least.

Good luck

[RobertoIsRad]

Hi, I recently found two free non-working LCD monitors on craigslist. Both have the same issue, No power. The LED on the power button does not light up at all and pressing it does nothing. I have tried different cords and different outlets and it doesn't make a difference.
When I opened up the monitor all of the caps on the power supply look good but there is a brown spot on both boards in the same area. I don't really know where to go from here. I have a multimeter and have replaced components on a board before.
I would be willing to do a mod like this http://computerguru365.blogspot.com/...l-monitor.html if I could have a little help on where the wires should go.

Thanks!

Pictures attached