Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashlight

[tazwegion]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

If you have problems getting the CFL to work, try replacing both the Mosfets, not just one.

Interesting you should say that then turn around and only replace a couple of the CapXon capacitors (220uF I would imagine), wouldn't it have proven more prudent to replace them all?


The white glue compound is best removed by an implement that wont scratch the circuit board and a little heat from the soldering iron... worked for me

[jayhaich]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Hi Guys,
Just had fun fixing my Acer 1916W, 2 x Mosfets, 2 x Caps, 3 x Fuses. I substituted the AP40T03 with some RFP50N06 from a old UPS.
If you have problems getting the CFL to work, try replacing both the Mosfets, not just one.
http://jayhaich.blogspot.com/2011/03...air-1916w.html

[jeopardise]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Thanks TS. This is definitely a good reference. My AL1916 CCFL doesn't lit up and I saw the LCD is still working under flash light.

[bonney]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

These are very good

http://www.dalbani.co.uk/index.php

have no interest in seller

[RANDOLPHG]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Thanks Plainbill, will check it out. greg

[PlainBill]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

I Googled buy OZ9910GN and got a number of hits, including this one. The usual disclaimers apply - no financial interest in the seller. Interestingly, this appears to be eBay's Philippines site, but the seller is in Fort Lauderdale, FL, USA

PlainBill

[RANDOLPHG]

Re: Monitor Is Fixed!!!

i will like to know where i can get the 0z9910gn, i have the same problem, i am in Trinidad, maybe i can get from a electronic store in miami, my email is rgregoey@tstt.net.tt, thanks for your help in advance.
greg

[marchie]

Re: Monitor Is Fixed!!!

i have the same problem...where did u get the parts...i need f-200..ic 201 and 202...and the OZ9910GN

later

[PlainBill]

Re: Monitor Is Fixed!!!

Thank-you all for your replies! My monitor works once again. I ordered a new replacement for the OZ9910GN as ivanlee05 had pointed out that the original chip's VREF measurement wasn't correct. This did the trick.

For those ever having to replace this chip for this model/version of monitor, know that after unsoldering it, that it is glued to the board. I used pliers to pull it off and in doing so I damaged a couple of traces which required jumping when installing the new chip. In retrospect I should've been more careful. Regardless, it now works just as it once did.

Hopefully this monitor will last a while longer considering the newly installed Caps, Fets, and Inverter IC. (Which is multiple times cheaper than a new one.) Thanks again to all who posted on this thread and the many other threads I've learned from to help with this.

Thanks for the feedback - and the warning about the inverter controller.

PlainBill

[Anonymous333]

Monitor Is Fixed!!!

Thank-you all for your replies! My monitor works once again. I ordered a new replacement for the OZ9910GN as ivanlee05 had pointed out that the original chip's VREF measurement wasn't correct. This did the trick.

For those ever having to replace this chip for this model/version of monitor, know that after unsoldering it, that it is glued to the board. I used pliers to pull it off and in doing so I damaged a couple of traces which required jumping when installing the new chip. In retrospect I should've been more careful. Regardless, it now works just as it once did.

Hopefully this monitor will last a while longer considering the newly installed Caps, Fets, and Inverter IC. (Which is multiple times cheaper than a new one.) Thanks again to all who posted on this thread and the many other threads I've learned from to help with this.

[ivanlee05]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Inverter IC 0Z9910GN's VREF should be fixed at +5v.

[retiredcaps]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

I also replaced fuse F200 but as soon as i soldered it in place it popped straight away !

You didn't post a picture, but if your fuse is next to the AC adapter, check your bridge rectifier. See

https://www.badcaps.net/forum/showth...t=Acer+AL1916W

for a similar problem.

[PlainBill]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Hi all,

Just wondered if you had any success with this Inverter ?
I have the exact same inverter with similar fault (CCFL not working)

I have also replaced both IC201 & IC202 as well 4 bulging caps.

I also replaced fuse F200 but as soon as i soldered it in place it popped straight away !

Any ideas would be greatly appreciated

You have a short. Maybe one of the replacement parts is shorted, another part is shorted, or you created a short by bridging two points when soldering.

PlainBill

[Anonymous333]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see wFlashlight

No Shortcake1972, I'm still awaiting to see if anyone has any ideas myself. I imagine the source / cause of your problem may be different than mine as my board doesn't blow fuses.

[shortcake1972]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Hi all,

Just wondered if you had any success with this Inverter ?
I have the exact same inverter with similar fault (CCFL not working)

I have also replaced both IC201 & IC202 as well 4 bulging caps.

I also replaced fuse F200 but as soon as i soldered it in place it popped straight away !

Any ideas would be greatly appreciated

[Anonymous333]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see wFlashlight

- The Backlight Inverter Transformer Secondaries measure 749 Ω and 752 Ω

- IC200 Voltage Results:

... IC200 ....... Power On .... Standby

Pin 8 (ENA) ..... 3.218v ....... 0.018v

Pin 12 (VREF) .. 2.345v ....... 0.001v

Pin 13 (VIN) .... 19.84v ....... 20.19v


Pin 8 does change state when the power button is pushed. When Powering On (Green Light) it goes from 0v to 3.2v for 3 seconds, back to 0v for 3 secs, back to 3.2v for 3 seconds, then into Standby (Amber Light) at 0v again and stays.


Schematic: Inverter Board - DELTA DAC-19M008.pdf
Schematic: IC200 - OZ9910GN.pdf

Picture: Inverter Board - Top
Picture: Inverter Board - Bottom
Picture: Logic Board

[PlainBill]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

Thanks for the information and especially the links to the docs; it makes it much easier to help you.

Here's a few points I would like you to check. What are the voltages on IC200, pins 8, 12, and 13? And if you could verify that pin 8 changes state when the power button is pushed, that would also help.

PlainBill

[Rtech]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see with Flashl

One other thing I would measure, is the resistance on the output ends of the Transformer,which feeds the Bulb output sockets.If one end is significantly different from the other, then this can cause your problem.

[Anonymous333]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see wFlashlight

Another correction: I accidentally cut out the categories that make this make sense before the final posting:

- Logic Board Connector Pins 15 & 16 Voltage:

........... Active ... Standby

Pin 15 ... 3.27v .... 0.006v

Pin 16 .. 0.018v .... 3.25v

[Anonymous333]

Re: Acer AL1916W Ab Monitor, DAC-19M008 - No Backlight, Recapped, Can see wFlashlight

Thanks for responding to my post. I have only now had time to sit down and check the monitor.

First off, I'd like to correct the error in my first post (for those possibly having this problem, and are reading this later) regarding the names of the MOSFETS, which should read (IC201, IC202).

Answers to previous questions:

- The Bulbs test OK.

I was able to check the bulbs of the monitor by plugging them into an inverter board from a separate Acer 1916W monitor that I had limited access to. (I had to temporarily rearrange the wire/connector pairing configuration as this was a later model board with a different layout, so I wasn't able to compare boards.) This test proved to be successful in illuminating fully all bulbs in the initial monitor. So we know for sure that the bulbs work.

- All Fuses test OK.

As mentioned in the first post, I had initially found Fuse F200 blown and had replaced it. (Later a careless testing mishap with the multi-meter resulted in me blowing Fuse F102, bridging it, and retested to make sure my LCD still worked when plugged into an active source and aided with a flashlight. It does.) So all remaining fuses F100, F101, F200, and bridge F102 are OK.


- Capacitor C200 = 18.25v (As measured negative to positive terminals of cap with the inverter board plugged in, but separated from logic board. Let me know if this makes a difference as I will remeasure.)


- Logic Board Connector Pins 15 & 16 Voltage:

Pin 15 ... 3.27v .... 0.006v

Pin 16 .. 0.018v .... 3.25v


- No response at all from CCFL's when power cycling.


- IC200 Label:

OZ9910GN
53150891T
0621B2

- New Capacitors:

.. Link .... V ...... μF ... Series . Measured V

CE104 .. 10v .. 1000μF .. PW ..... 5.01v

CE105 .. 10v .. 2200μF . KXM .... 5.01v

..C200 .. 25v ... 220μF .. SEK ... 18.25v
CE101 .. 25v ... 220μF .. SEK ... 18.28v
CE109 .. 25v ... 220μF .. SEK ... 14.17v

CE108 .. 25v ... 330μF ... PM ... 15.34v

CE102 .. 25v .. 1000μF .. CKE ... 18.27v
CE103 .. 25v .. 1000μF .. CKE ... 18.27v

CE107 .. 50v ..... 22μF ... PW ... 10.43v
--------------------------------------

CE106 . 400v .... 120μF ... AQ ... 168.5v .... [Original Large Taicon Capacitor]

*Note: At the time I ordered the new caps, I now realize that I believe I didn't put enough effort into better understanding the difference between them concerning ESR ratings and such. (I now know that I could have more easily searched elsewhere by better brands and series. ...i.e. Panasonic FC's) All the new caps retain the same Voltage and Capacitance rating as the originals. The links provided go to the page at which I bought them from; each having their own data sheet links. As far as I know, some of these could very well be, or be part of, the problem.

For completeness, I also provided the voltage measurement across each capacitor (with the inverter board plugged in, but disconnected from the logic board. Once again, I'm not sure if there are other variables that are missing in some instances by having it disconnected.) to show that they at least seem to be ...alive of sorts.

- Additional Info: While plugged in, constant high pitched tones can be heard from both the Transformer area and the Line Filter & Cap area of varying frequencies and intensities depending on whether or not the inverter is plugged into the logic board, whether the power button is on or off, or whether its in standby or not. All different tones. It's most quiet when its both turned on and the Green Light is on. Loudest in Standby mode. This could just be completely normal for this particular board configuration, but I thought I'd mention it as well.

Once again, I appreciate the help!

Inverter Board Schematic:

IC200 Chip Schematic: