Chimei DAC-19M009 Power Supply problems

[RethoricalCheese]

Re: Chimei DAC-19M009 Power Supply problems

I am not 100% sure but I will worry about that later. I am 100% sure that one of the boards is faulty.

As a replacement I used leaguer and jamicon caps, which have been working before too (I have fixed 100-200 LCD-s using these caps)

I replaced 22uF 50V cap with 33uF 50V cap and the problem persisted.
Voltage across that cap is 12.5V

When I removed 5V rail fuse for testing, there was no clicking sound anymore while I had controllerboard connected. Just letting you know, maybe it helps with something.

[selldoor]

Re: Chimei DAC-19M009 Power Supply problems

Hmm, so are you sure the ccfls are good? if one is bad again the protection would kick in.
What make/series of caps did you use as replacements, and did you replace the 22uf50v startup cap - what voltage do you get across it?

[RethoricalCheese]

Re: Chimei DAC-19M009 Power Supply problems

Yes, I am aware of that but it has nothing to do with the problem at the moment. The problem is that there is a certain clicking sound and it does not start up (with or without CCFL-s connected, it doesn´t really matter)

[selldoor]

Re: Chimei DAC-19M009 Power Supply problems

Without bulbs connected the powersupply/inverter will go into protection and never start.

[RethoricalCheese]

Re: Chimei DAC-19M009 Power Supply problems

While I tested, I had no LCD panel even connected. Only the power supply board, controllerboard and buttonboard. Nothing else.

The model in question is VX2235wm

[selldoor]

Re: Chimei DAC-19M009 Power Supply problems

Boss - what monitor/model is it on - the bulbs and wiring on some chimei monitors tend to burn up.

[RethoricalCheese]

Re: Chimei DAC-19M009 Power Supply problems

Having a problem with the same board or maybe even with the other board.
It had bad caps so I changed them. Got the monitor working. A week later it did not work anymore. When plugged in, there is a clicking sound and 2 LED lights in front are blinking (I could barely see it) in the same tact as the clicking sound.

There is no clicking sound when the other board is not connected.

I tested out large cap - OK, rectifier - OK, SMPS has 11.7V - OK (according to datasheet), 13.8V - OK, 5v - OK. Removed F200 - still same problem.
All caps have been replaced.

Taking in mind this information, is the problem hidden in power supply board or logic board/controller or whatever you call that.

[Rtech]

Re: Chimei DAC-19M009 Power Supply problems

Measuring the Voltage across the large cap is the first thing to check, and should be about 1.4 times the AC input voltage,,although the measurement will be DC volts.If that is fine, then on the bottom of the board is an 8 pin SMPS chip...find the Datasheet,and check what voltages you have particularly the Vcc pin.

[cnservices]

Re: Chimei DAC-19M009 Power Supply problems

I've recently acquired the VX2235WM monitor with the DAC-19M009. My issue is no power, no LED light. I've read through this thread and tried mostly everything in my ability. I have done electronics years ago in the Navy, but a little rusty on the soldering. Here's what I've done so far:

Visual Inspection - no leaking/bulging caps, no noticeable solder issues
Tested F200 and and F101 fuses -good
Tested the big cap (400V 120uF) - good
MOSFETS tested good
Removed the startup cap and tested - good
Bridge Rectifier tested good
Tested the pins connecting to the logic board, no 5V to be found.....

Not sure where to look next. Please bear in mind I'm waaaay out of practice with this, so you may get a response of "huh" or "how do I do that"

Thanks for any help you can offer

[ntehicks]

Re: Chimei DAC-19M009 Power Supply problems

Chimei DAC-19M009 Power Supply problems
I have the same problem with my power supply. I have tested and the fuse right under the power is blown. I have also tested the bridge rectifier it is bad. I have replaced both and still the fuse blows. I have tested the P10NK60ZFP and it tests good. my question is does anyone know what the transformer should test? the label on the pcb is LF100

[PlainBill]

Re: Chimei DAC-19M009 Power Supply problems

Thanks for the fast response... and I do mean fast!

De Nada.

PlainBill

[cds1984]

Re: Chimei DAC-19M009 Power Supply problems

Thanks for the fast response... and I do mean fast!

[PlainBill]

Re: Chimei DAC-19M009 Power Supply problems

Hi,
I'm trying to identify one cap that the white glue pulled the sheath off and I couldn't read.
Any chance someone could take a look and forward on the value?

Please see cap circled in red on the pic.

Thanks!

Startup cap. 22uF, 50V. Identified here.

PlainBill

[cds1984]

Re: Chimei DAC-19M009 Power Supply problems

Hi,
I'm trying to identify one cap that the white glue pulled the sheath off and I couldn't read.
Any chance someone could take a look and forward on the value?

Please see cap circled in red on the pic.

Thanks!

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

hi all ,

I'm so glad o find this forum :-)

I have the same ps board Chimei DAC-19M009 and have problem:
it started few month ago.
when the pc was of the led was orange (no signal) when I turned the pc on the led turned off (now it has signal) and I needed to wait 3~10 minutes until the led turned green and the screen was on and worked fine . during this time that the led was off and the screen was off I was hearing high pitch sound (like caps charging sound ) and it was going on and off (sound-> no sound....)
so now the problem is that the screen not turning on even after 15 minutes the led returns to orange (windows power saving turns monitor off after 15 minutes idle) and if I move mouse it turning off again trying to turn on

I opened not the monitor and it looks like the board you are discussing on
and the 3 crapxon caps 220uF-25V and one 2200uF-10V are bulged at the top .

what do you think ?should it be the problem?
I found the repair kit on ebay:
http://cgi.ebay.com/DAC-19M009-REPAI...#ht_2448wt_698

Thanks in advance

I would advise you to select the brand and type of capacitors according to this forum's post https://www.badcaps.net/forum/showthread.php?t=2280
If it is like one i saw (the listing you posted has nichicons which are good overall) ask the seller what exactly type are the capacitors (e.g. PM, PW, HE etc.)
Hope this helps.

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

Same here as Mishael guys! Great news!
I replaced all the C(r)apxons capacitors with Rubycon capacitors (1000uf-25v x 2 and 220uf-25v x 3) and the monitor works like a charm! The other capacitors seemed fine so i left them as they were.

Thanks for all of your support and advice!
Keep on supporting this great forum!

Cheers!

[Mishael]

Re: Chimei DAC-19M009 Power Supply problems



It worked!!! I have replaced the 3 220uF 25V and 1 2200uF 10V caps and it work's now!!! thank you all!!

it cost'd me just 3$ lol

[PlainBill]

Re: Chimei DAC-19M009 Power Supply problems

hi all ,

I'm so glad o find this forum :-)

I have the same ps board Chimei DAC-19M009 and have problem:
it started few month ago.
when the pc was of the led was orange (no signal) when I turned the pc on the led turned off (now it has signal) and I needed to wait 3~10 minutes until the led turned green and the screen was on and worked fine . during this time that the led was off and the screen was off I was hearing high pitch sound (like caps charging sound ) and it was going on and off (sound-> no sound....)
so now the problem is that the screen not turning on even after 15 minutes the led returns to orange (windows power saving turns monitor off after 15 minutes idle) and if I move mouse it turning off again trying to turn on

I opened not the monitor and it looks like the board you are discussing on
and the 3 crapxon caps 220uF-25V and one 2200uF-10V are bulged at the top .

what do you think ?should it be the problem?
I found the repair kit on ebay:
http://cgi.ebay.com/DAC-19M009-REPAI...#ht_2448wt_698

Thanks in advance

Yes, that is most likely the problem.

PlainBill

[Mishael]

Re: Chimei DAC-19M009 Power Supply problems

hi all ,

I'm so glad o find this forum :-)

I have the same ps board Chimei DAC-19M009 and have problem:
it started few month ago.
when the pc was of the led was orange (no signal) when I turned the pc on the led turned off (now it has signal) and I needed to wait 3~10 minutes until the led turned green and the screen was on and worked fine . during this time that the led was off and the screen was off I was hearing high pitch sound (like caps charging sound ) and it was going on and off (sound-> no sound....)
so now the problem is that the screen not turning on even after 15 minutes the led returns to orange (windows power saving turns monitor off after 15 minutes idle) and if I move mouse it turning off again trying to turn on

I opened not the monitor and it looks like the board you are discussing on
and the 3 crapxon caps 220uF-25V and one 2200uF-10V are bulged at the top .

what do you think ?should it be the problem?
I found the repair kit on ebay:
http://cgi.ebay.com/DAC-19M009-REPAI...#ht_2448wt_698

Thanks in advance

[LuSiD]

Re: Chimei DAC-19M009 Power Supply problems

Sorry, my bad...
I live in Greece. I will check the other two you suggested.
You are really helpful around here. Appreciate that. Thanks!