KDS Business K Series K22mdwb not turn on

[neotremer]

Re: KDS Business K Series K22mdwb not turn on

Anyone know where i can buy a new power board? I cant seem to find a place.

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

Unknow, first time not turn on, try replace parts but not working. last couple week find another power supply board had couple bad cap, replace all new caps & install the monitor turn on but gradients showing as banding on LCD
Thanks

[gasan]

Re: KDS Business K Series K22mdwb not turn on

so when you replaced the power supply you got the color problem????????

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

Any one had Ideal to fix my KDS monitor?
Thanks

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

I check all setting & follow to display color calibration but still the same (if thay had goog picture & can't see text + display dark)
Need help

[seanc]

Re: KDS Business K Series K22mdwb not turn on

If you're referring to the gradients showing as banding, check your display properties are set to use 32bit colour.

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

I find another power/inverter board with some bad cap (replace all new cap) now I had another problem the screen not right color
I take some picture, some one help me
thanks

[ecking767]

Re: KDS Business K Series K22mdwb not turn on

I get AOD442 at local electronic store and install powerboard, now monitor can't turn on + no powerlight & screen.
Will T/S late
Thanks

something is shorted across the power supply, check the MOSFET for shorts. check the filtering caps for shorts

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

I get AOD442 at local electronic store and install powerboard, now monitor can't turn on + no powerlight & screen.
Will T/S late
Thanks

[retiredcaps]

Re: KDS Business K Series K22mdwb not turn on

Thanks
Where you order the AOD442?

$1.01 at digikey.

http://search.digikey.com/scripts/Dk...=785-1107-1-ND

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

hoadle thanks for the schematic, I have work on this board with out a schematic for a while now. I was off by one digital for the other part number. Its AOD442 not AOD444. You must get the right MOSFET in place before doing anything!!!

Thanks
Where you order the AOD442?

[ecking767]

Re: KDS Business K Series K22mdwb not turn on

hoadle thanks for the schematic, I have work on this board with out a schematic for a while now. I was off by one digital for the other part number. Its AOD442 not AOD444. You must get the right MOSFET in place before doing anything!!!

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

I'm 100% percent sure you have replace your output transistors with the wrong part. TIP3055 is a transistor, On that particularly board the output transistors are MOSFET. Here is the part number PHD3055E

http://www.alldatasheet.com/datashee.../PHD3055E.html

I have seen this board using a AOD444 for the output transistor too..

please confirm..

I think you right here diagram

http://www.4shared.com/get/vkH_vj3t/...2BB5FAFB.dc210

[ecking767]

Re: KDS Business K Series K22mdwb not turn on

Now I replace 2 Tip3055 transitor now powerlight on but backlight turn on about second & off. Find out top backlight is on & bottom not on that why is shut off run out option need held
Here the top & bottom board picture

I'm 100% percent sure you have replace your output transistors with the wrong part. TIP3055 is a transistor, On that particularly board the output transistors are MOSFET. Here is the part number PHD3055E

http://www.alldatasheet.com/datashee.../PHD3055E.html

I have seen this board using a AOD444 for the output transistor too..

please confirm..

[retiredcaps]

Re: KDS Business K Series K22mdwb not turn on

Find out top backlight is on & bottom not on that why is shut off run out option need held

Try testing both transformers as per step #4

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

Compare all measurements. The 2 transformers should be very close or identical.

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

Now I replace 2 Tip3055 transitor now powerlight on but backlight turn on about second & off. Find out top backlight is on & bottom not on that why is shut off run out option need held
Here the top & bottom board picture

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

I had KDS Business K Series K22mdwb its not turn on (not powerlight & Lcd monitor)

On KDS Business K Series K22mdwb had POWER SUPPLY 200-000-DTLBMH PI-190DTLB & find one site sale but in hongkong but main thing I want to know how to fix the problem

I already replace all new electrolytic cap & replace one trasistor too & late is burn out again

http://www.dgdw.cn/dewang%20power/PI...er%20Board.htm

any one can help me?

thanks

try pot back side the board soon

[hoadle]

Re: KDS Business K Series K22mdwb not turn on

I will pot the picture soon, but I already replace all cap & back side the board had burn Transistors, I replace new one is turn on about 2 min & smell burned & open and Transistors i replace is burned again
Yes I had 2 DMM (multimeter)
Fluke 115 & Fluke 87

[PlainBill]

Re: KDS Business K Series K22mdwb not turn on

Post clear focused pictures of your board after reading

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

Do you have a multimeter? If yes, what is the brand/make and model number?

edit: PlainBill beat me to the punch writing this. I'm soldering in a new chip in between questions.

And I'm following a baseball game. Who do you think will have more to show for it at the end of the evening?

PlainBill

[retiredcaps]

Re: KDS Business K Series K22mdwb not turn on

I had KDS Business K Series K22mdwb its not turn on (not powerlight & Lcd monitor)

Post clear focused pictures of your board after reading

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

Do you have a multimeter? If yes, what is the brand/make and model number?

edit: PlainBill beat me to the punch writing this. I'm soldering in a new chip in between questions.