Fixing a DAC-19M005 Power Supply - check my DX:

[blackrider1]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

I´m having same experience. Recapped all the caps, changed Q206 and Q205, replaced F200 (although it was ok. I did it a continuity test. Why you guys do a GND-ONE TO OTHER SIDE test?) Replaced Q204 (it was burnt), Q208 (Not neccesary but I ordered them too), R210 and R206 (they were ok too)
All fuses seem to be ok (continuity test), I have 5V and 13,8 V at logic board connector (CN5).
All jumpers ( 0 SMD) are ok.
And I get video but no backlights,when I turn it on, backlights are flashing for a while (less than 1 second) and that´s all.They keep on flashing from time to time, when I press any key on the frontal pannel.I have green and orange led working too.
I can hardly see the Menu Screen when pressing the Menu key, but that´s all.
I want to test pin 9 of the U200 and see what vcc is on it, but I need to dissambling the 2 boards and turn them back to do it ( or solder an little wire on that pin).
Should I test all the Diodes (Q201,Q203,Q204 and Q208)and resistences close to the 4 transistors?
Any idea?
By the way,sorry for my English if I made mistakes.
Thanks

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

Here's where I'm at.
Before the schematic was available, I removed the controller to see if the pad of pin 13 that was going to ground or there was a problem with the controller. After I looked at the schematic it obvious that pin 13 is tied to ground. I substituted another controller when I reinstalled it. There was no change the power supply would still shut down.
I have tried to separate the circuit to see if I could get an idea on an area to concentrate on.
Removing resistor R206 that is tied to pin 9 of the controller made no difference, The PS shut down.
Next I removed R208 and D216 from circuit at that time the 5v and 13v does not shut down.
I have checked all the Q items and d216 for a shorted condition and I am not finding any.
Any ideas on thing to do or check next?

[blackrider1]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

I´m glad to hear about it. I hope this schematics help you guys (and me too) understanding and fixing this faulty boards.
Thanks.

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

After opening with XP and copying the file to the Win 7 computer, I was able to print the diagram using the snipping tool in accessories folder of the Win 7 computer.
Its amazing I learn something new every day

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

^
I could not get it to open with Win 7,so I had to use an XP computer and I was able to open it
Thanks.
Now if I just could get it to print.

[blackrider1]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

Done

http://www.megaupload.com/?d=ZZHAGME6

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

Hi Alexanna, it is a compressed file, with Winrar, that contains a PDF file. Just download it to a known location in your pc and extract it. If you can´t get it, tell me and I will upload it without compressing, just plain pdf.
Thanks

Yes please do the PDF

[blackrider1]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

Hi Alexanna, it is a compressed file, with Winrar, that contains a PDF file. Just download it to a known location in your pc and extract it. If you can´t get it, tell me and I will upload it without compressing, just plain pdf.
Pages 10 to foward contain the schematics and a components list. I just tried it and there´s no problem with the download. I can´t attach it here because of its size (2,38). Probably you will be required to install chinnese fonts type when reading this pdf, because there is some chinnese text, at least with WXP, install it if you want, although it is not necessary. Just need Adobe Acrobat or any free pdf reader to view it.
Thanks

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

You can see, depending on board revisions, some minor changes, like F200, changed from 2A to 4A, or caps CY 2001-218-216-200 (close to the backlights connectors), 4 of them on the front side in one revision and 3 of them on the front side and one on the back side (C218-1) in another versions, but everything else looks like equal.
Anyway, I hope this datasheet to be useful for you guys.
Thanks

It might be helpful to see a schematic of this INV/PS.The link you provided requires some type of program to open a RAZ? Type file which of course I do not have.
If you have the entire schematic it would be helpful if you posted it, rather than a link to it.

[blackrider1]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

You can see, depending on board revisions, some minor changes, like F200, changed from 2A to 4A, or caps CY 2001-218-216-200 (close to the backlights connectors), 4 of them on the front side in one revision and 3 of them on the front side and one on the back side (C218-1) in another versions, but everything else looks like equal.
Anyway, I hope this datasheet to be useful for you guys.
Thanks

[blackrider1]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

Helloo, although I posted on the Westinghouse thread yesterday, I think it willl be fit here too.
I post the datasheet of this powerboard, so It could be usefel to correctly identify the components.
For instance, the fuse F 102 is a RES MF Fusible 1/2W 100ohm J SAMLL.

I´m having problems with my ACER 2017 (Just 1 video input, DSUB,no DVI input) with revision CF of this board.

This monitor, after recapping all (bulged ones and others), still keeps on showing me images on the screen but no backlights. All the fuses were OK, instead.
Here is a copy of my post on the Westinghouse thread:

"Hello,although this post was started several years ago, it still keeps alive, so, after reading the whole tread, I think I can help a little.
When trying to fix an ACER 2017, I used this dac-19m005 datasheet I found on the web.

http://www.megaupload.com/?d=YJWEDABQ

Here you can see schematics and components. Although it is a different LCD model, is has the same power board: DAC-19M005 CF REV: 00A, (plus it has just DUB conector, no DVI, but still the same board too), so: same problems and same fixes, I guest.
After recapping all (same 2 bulged caps as every faulty board), I can see images on the screen but no backlight. You only can see it taking a light close to the screen ( I didn´t read anybody in this situation, everybody has no light but nobody has mentioned about dark images with no backlight)
All the fuses on the backside are OK but I can see a damage transistor: Q204, on the backside, right close to the F200 4A fuse, so probably this is what I need to fix.
According to Kahless (on post #299 and # 301) and billy 66 ( #320) I can see Q2004 burnt ( probably that´s because F200 fuse didn´t blew up), but I checked R210 and I got about 11 Ohm, so I think it´s Ok. Anyway, I ordered replacements for the whole components:Q204,Q208 and R210.
I´ll post the results when I get it working here or in a new thread refering ACER 2017 (only DUB, no DVI conector)"

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

I looked through my supply of used boards, and I have one from a monitor with a broken screen that uses the same controller. Pin 13 does not show continuity to ground.
When I get the energy I will remove it and install it on the Acer, unless anyone has any other ideas.

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

Pin 13 of the Bit3713/Bit3193 shows it's connected to ground.
As long as the logic board is not connected the power supply continues to work.
http://pdf1.alldatasheet.com/datashe...C/BIT3193.html

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

^
Q201-3-4 and Q208 do not indicate a short.
R209 is reading 4.7K ohms and R210 is 10 ohms

[jetadm123]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

I wonder if anyone has found a common cause, After Mosfet replacement as to why the 4 amp inverter fuse would blow.
All the capacitors have been replaced, and I am not finding any transistors or diodes in the inverter are shorted.
I do not recommend anyone doing what I have done, but out of frustration I have substituted a 5amp ATC type fuse for the 4amp fast blow inverter fuse hoping I would get some indication of something being shorted[in other words I wanted to let the smoke out]
With the 5amp fuse substituted, I get a very brief flash of all the backlights of about the same intensity. But the power supply is smart enough to shut down before any damage is done.
With the inverter fuse removed, the 12volt rail is able to light an automotive 1157 bulb brighter filament so I know the power supply is able to perform under a load.
The inverter controller is a BIT3713
I feel this may be a common problem on this DAC-19m005 power supply
I have a feeling that everyone will want to refrain from getting involved in this, but I thought I'd ask.

Below the F200 fuse are 4 transistors: Q201,203,204 and 208. Check these for shorts. Also, check diode D216 for a short. And finally, check the vaules of resistors R209 and R210. All components are below the the F200 fuse.

[alexanna]

Re: Fixing a DAC-19M005 Power Supply - check my DX:

I wonder if anyone has found a common cause, After Mosfet replacement as to why the 4 amp inverter fuse would blow.
All the capacitors have been replaced, and I am not finding any transistors or diodes in the inverter are shorted.
I do not recommend anyone doing what I have done, but out of frustration I have substituted a 5amp ATC type fuse for the 4amp fast blow inverter fuse hoping I would get some indication of something being shorted[in other words I wanted to let the smoke out]
With the 5amp fuse substituted, I get a very brief flash of all the backlights of about the same intensity. But the power supply is smart enough to shut down before any damage is done.
With the inverter fuse removed, the 12volt rail is able to light an automotive 1157 bulb brighter filament so I know the power supply is able to perform under a load.
The inverter controller is a BIT3713
I feel this may be a common problem on this DAC-19m005 power supply
I have a feeling that everyone will want to refrain from getting involved in this, but I thought I'd ask.

[kingofcoins]

Re: Acer AL1916WA.. final problem...the CCFL

Looks like I won the battle but lost the war on this one. I found the bad ccfl had a burned off wire. I did my best small wire splice and tight solder on the lamp end...three times...and it tested bright before reassembly and again after...BUT when connecting all 4 ccfls the monitor does the 2 step. When I replug my spare test lamp in place of the repaired one the back-lights stay up. The repaired lamp did not look any worse than the others, and lit up to the same degree as the others.

Questions for you on repairing lamp problems...
1). Since all 4 lamps need to work in the circuit, am I right assuming that my 'repaired' lamp is still 'bad', and drawing a voltage that upsets the balance, and a regulator and shuts the light down?
OR...>do I still have some other inverter circuit problem?
2.) My 'repaired' lamp still works on my test circuit since it doesn't care that its lighting one lamp or two and its voltage can be down to 10 Volts ..true ?
3.) Do lamps suffer 'hidden' damage though not burned out ?
4.) Do you ever successfully repair lamp solder failures, or do you automatically replace lamp while in there?

I my case I successfully repaired the power supply, as in prior posts, and found open fuses, and found the bad lamp, and go to see the steady desktop. I got the experience, but now some extra parts, since the dis-assembly and reassembly of the LCD those several times, somehow I stressed the edge and it splintered and ruined the screen.

Thanks for your feedback on lamp repair, and all the earlier support too.

Dan

[kingofcoins]

Re: DAC-19M005 Power Supply - using temp fuses

Ok... I Got It Running !!
I rigged up some more homemade tools to re-test this power supply board, and found it was repaired correctly with the 7 caps and then the 2 mosfets, except that either I blew the 2 SMD fuses F100 and F101 during my last lamp test, or way back when I had installed a cap backward one of them blew.
See pic of my test rigs, one auto type fuse holder, the second fuse soldered to the test wires, and my test lamp in place of the 3rd ccfl....which was the source of the monitor problem itself.
I am using this supply board on an Acer 1916WA monitor so its ccfl lamp is the problem now. Before I do this lamp, anyone have repair experience on such Acer lamps ? Does the connection fail on these, or is it more often the lamp itself, or was it the power control failure/fuse/cap ?
Any tricks to doing these Acer ccfl's?

Al..> on fuses...I believe the Bourns N=1.6A makes sense...so I'll use a 1.5amp in a holder across my F100 and get on with the testing....btw, where do you salvage such small fuses from ?

On the Schotty's D102,and D103, both tested the same, here's what I got back at post #45...>
..." Now I've re-tested both this way in circuit, with my analog VOM , for SBT 150 the legs 1 and 3 anode, 2 cathode....red to anode with black to cathode appears open (infinity no reading), reversing probes get about 6 ohms, other leg tests the same open and 6...and the other D102 same readings as the first.."

[kingofcoins]

Re: Moving thread : Getting a used digital mulitimeter

Thanks for cleaning up our act, sir.

Let's move this to the thread "Recommend me a MultiMeter" so we don't pollute this thread too much

https://www.badcaps.net/forum/showthread.php?t=7557

[retiredcaps]

Re: Getting a used dgital mulitimeter

What do you recommend for the meters capabilities to do diodes, mosfets, and transistors ?

Let's move this to the thread "Recommend me a MultiMeter" so we don't pollute this thread too much

https://www.badcaps.net/forum/showthread.php?t=7557