Chimei DAC-19M009 Power Supply problems

[jetadm123]

Re: Chimei DAC-19M009 Power Supply problems

Really helps if member's post their location. Price I quoted was for the USA. How about Farnell or RS components?

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

Digikey wants 18 Euro to send me 10 capacitors... Reliable maybe, but not that cheap...

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

OK, will do that!
I will post pictures and let you know of the progress. I hope everything is going to be fine and that my LCD will come back to life.

Thank you very much!

[jetadm123]

Re: Chimei DAC-19M009 Power Supply problems

Honestly, I personally don't recommend subbing the 19M010 for the 19M009 because there could be enough of a design difference between the two that might cause problems. The recommended procedure on this forum is to try and repair your existing board. And the first order of business would be to replace those caps before going any further. Total cost should be around $10-$11, shipping included.

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

Wow! This is what they call "Fast Reply"!!! Thank you for your remarks and advice.

These Capxon capacitors are really crap(xon). A lot of people are having the same problem. Such a shame that they pick these for building a nice LCD with a lot of features that eventually will fail (in shorter time than usual!).

Would you suggest me to go for the 19M010 board? I am not that experienced in soldering...
I have found one on eBay that is relatively cheap. Is it ok to post the link in here? I hope i will not violate any rules...

[jetadm123]

Re: Chimei DAC-19M009 Power Supply problems

Thanks for the photos because they really help in the diagnosis of the problem. It looks like several of the caps are bulged at the top and need to be replaced. The ones I'm referring to are the black ones (Capxon?). The green Taicon ones should also be replaced. The large 450V can be left alone. That leaves 9 caps that should be replaced. Suggested replacements are Panasonic FR, FM or FC series from digikey.com.

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

Hello all,

Bringing back the same post with somewhat the same problem...
I own a Viewsonic VX2245wm and guess what! The screen went black. Only the blue power indicator and an instant (less than a second) flash without any image whenever i try to connect it to my PC's video card.
My question is simple enough. How do i know it is the PCB and not the inverter? All capacitors seem fine (see the attached pics) or i think they are.
And one more... Is it possible to replace the 19M009 with the 19M010 that i found on eBay? Does it lack the soundboard or is it the same with a new design?

Thank you all and thumbs up to you all, this is a great forum!

[retiredcaps]

Re: Chimei DAC-19M009 Power Supply problems

you should replace all at once.

Assuming you replace all of them as kc8adu suggests, keep one or two that look good so you have a "good" ccfl for testing in the future. That will help greatly in troubleshooting future LCDs because you can quickly eliminate the ccfls as good or bad.

[kc8adu]

Re: Chimei DAC-19M009 Power Supply problems

you should replace all at once.
i replaced all the ccfl's in a bunch of elo touch monitors when 1 died.easier than fixing them as the rest died.these are critical to a local business and run 24/7.
the old lamps had browning of the phosphor.

[retiredcaps]

Re: Chimei DAC-19M009 Power Supply problems

1)excuse the ignorance, it looks like these are wired in parallel, and if one was bad the screen might be dim, not dark.

2) what is the procedure for testing individual ccfls?

3) i was just going to replace all of them as i don't want to tear it down in a couple of months to replace a different one. Is the failure rate on these minimal and i have just experienced an anomaly or is replacing them all a smarter way to proceed, or am i just shot gunning the problem. Thank you

1) PlainBill describes 2 seconds to black best ...

https://www.badcaps.net/forum/showpo...2&postcount=18

https://www.badcaps.net/forum/showpo...8&postcount=64

After you read the above, you will understand why one bad ccfl will not make it "dim".

2) Testing ccfl. See step #5

https://www.badcaps.net/forum/showthread.php?t=10419

Since you have 2 monitors, it will be easy. You do not have to remove the ccfls to test. Just make sure the wires reach from one monitor to the other and don't let the monitors touch.

3) Replacing them all is a valid point if you use the monitor a lot (which it sounds like you do). I read that ccfls in LCD have a life of 40,000 hours +/- 10,000 hours. So if you have the monitor on 24 hours x 365 days = 8760 hours/year. I'm assuming if you have your monitor at 90% brightness (usually factory default), then the ccfl will die more quickly.

So it is possible that after 3.5 years of 24 hour use that all your ccfls may be "bad" and require replacement.

[ray123]

Re: Chimei DAC-19M009 Power Supply problems

I misspoke they are not in parallel, however I am still back to how to test them.

[ray123]

Re: Chimei DAC-19M009 Power Supply problems

[QUOTE=retiredcaps;124496]It may only be one ccfl that is bad, not all of them.

Thanks again for the quick feedback. Excuse the ignorance, it looks like these are wired in parallel, and if one was bad the screen might be dim, not dark. What is the procedure for testing individual CCFLs? I was just going to replace all of them as I don't want to tear it down in a couple of months to replace a different one. Is the failure rate on these minimal and I have just experienced an anomaly or is replacing them all a smarter way to proceed, or am I just shot gunning the problem. Thank you

[retiredcaps]

Re: Chimei DAC-19M009 Power Supply problems

I found some on Ebay for about $29.00 plus shipping.

Okay, I found that auction. I didn't realize it was for 4 ccfls. I guess you will have spares for the other monitor as well?

When replacing them, be very careful. They are super fragile.

[Wrog]

Re: Chimei DAC-19M009 Power Supply problems

Try (I have no experience with this vendor)

http://ccflwarehouse.com/meyoccla.html

I have purchased from ccflwarehouse before, and they worked great... I ended up buying from their eBay shop instead of the website though because it worked out a little bit cheaper.

[retiredcaps]

Re: Chimei DAC-19M009 Power Supply problems

These monitors are left on 24/7 as I don't like the power on power off problems that a lot of electronics have and I am accessing my computers all times of the day and night.

I hope you at least use the power save/sleep option on your computer. That way, at least the backlights are turned off. It only takes a 1 or 2 seconds for your computer and monitor to "wake" from sleep mode.

Funny, I always turn off all my stuff using a power bar when not in use. Have been doing it for 20+ years and can never attribute a problem due to power on.

The early PC days had hard drives that didn't park the heads when powered off and cause the heads to go skidding across the platters, but that has long been fixed.

[retiredcaps]

Re: Chimei DAC-19M009 Power Supply problems

It looks like it is the CCFL. I have disassembled the defective monitor to access the CCFL.

It may only be one ccfl that is bad, not all of them.

I found some on Ebay for about $29.00 plus shipping.

$29 seems like a lot. I would suggest finding out which one is actually bad. Single replacements could be a lot cheaper than $29.

The ones on Ebay at least call out the model number.

Try (I have no experience with this vendor)

http://ccflwarehouse.com/meyoccla.html

By the way three of the caps that I replaced just a couple of months ago are showing signs of swelling. Not a good sign, I will get more ordered for the next time.

Odd, what brand did you use for the replacement?

The recommended list of caps is at

https://www.badcaps.net/forum/showthread.php?t=2280

If you use digikey a lot, most here will recommend Panasonic FM or FC series as good quality low ESR caps.

[ray123]

Re: Chimei DAC-19M009 Power Supply problems

Thank you for the quick response. Great suggestion, just the kind of thing I tell techs when I am helping them. First mistake, assuming I had the same problem, " never assume anything".
I swapped the power/inverter board from working unit to defective unit, same problem. Install latest repaired power board to working monitor, that unit continued to work. It looks like it is the CCFL. I have disassembled the defective monitor to access the CCFL .I found some on Ebay for about $29.00 plus shipping. If anyone has a part number, I would be happy to check some of my sources. I buy from Mouser, Newark, DigiKey and a few others. Without a mfg part number or some specs. It would be a waste of time. The ones on Ebay at least call out the model number. By the way three of the caps that I replaced just a couple of months ago are showing signs of swelling. Not a good sign, I will get more ordered for the next time. These monitors are left on 24/7 as I don't like the power on power off problems that a lot of electronics have and I am accessing my computers all times of the day and night. They have giving me good service otherwise. I try not to buy CapXon as I have not had good luck with them. I did get low esr 105 degree exact matched value capacitor. I had to source from a couple of distributors. By the way guys, I really appreciate this site. Have not worked on LCD monitors, I come from the old tube days and have been working on other types of electronics for about 40 years, I have worked on older CRT type monitors, and I don't like to let any piece of equipment beat me. Thanks again..

[retiredcaps]

Re: Chimei DAC-19M009 Power Supply problems

I have two Viewsonic VG2230 monitors.

The quickest way to narrow this down is to take the "good" power/inverter board and put it in the "bad" one. If you get 2 seconds to black, you know it is the ccfl that is bad. If you don't get 2 seconds to black, then you know something on the inverter board is bad.

Do this test and report the finds.

I did this very test for 2 identical Benqs and was able to quickly narrow it down to the ccfl being the bad part.

[jetadm123]

Re: Chimei DAC-19M009 Power Supply problems

Hello, This is my first posting. I have read all the posts I can find on the DAC-19M009 Power Supply problems. I have two Viewsonic VG2230 monitors. The first one failed about two months ago and with the help on this thread I was able to get it up and running by replacing the caps and both of the mosfets. I order enough parts to repair the second one as I was sure it was not a matter of if, but when was the second one going to fail. Sure enough yesterday was when..
After replacing all the caps and the mosfets I have the 2 second problem. The monitor comes on for a couple of seconds and then goes out. I checked for cold solder joints and found none with the use of a lighted magnifying lamp. I and down to the SMPS controller. Is it possible to make any decent checks with the power/inverter board plug into power and the logic board only. I don't see any easy way of checking voltages on the bottom side of the board, with the lcd leads connected.

Welcome to the forum! I suggest you start a new thread with the title Viewsonic VG2230, since the make and model is what everyone relies on. Also, in your new thread include top and bottom photos of the power supply and logic board per the link below:

https://www.badcaps.net/forum/showthread.php?t=1868

[ray123]

Re: Chimei DAC-19M009 Power Supply problems

Hello, This is my first posting. I have read all the posts I can find on the DAC-19M009 Power Supply problems. I have two Viewsonic VG2230 monitors. The first one failed about two months ago and with the help on this thread I was able to get it up and running by replacing the caps and both of the mosfets. I order enough parts to repair the second one as I was sure it was not a matter of if, but when was the second one going to fail. Sure enough yesterday was when..
After replacing all the caps and the mosfets I have the 2 second problem. The monitor comes on for a couple of seconds and then goes out. I checked for cold solder joints and found none with the use of a lighted magnifying lamp. I and down to the SMPS controller. Is it possible to make any decent checks with the power/inverter board plug into power and the logic board only. I don't see any easy way of checking voltages on the bottom side of the board, with the lcd leads connected.