Samsung Syncmaster 225BW

[GR3Y5H3ART]

so i have read through this post:
https://www.badcaps.net/forum/showth...230#post144230

and hope that my problem is a bit different since i have already replaced the big three caps

the Monitor will turn on but will turn off within 5 mins.


if you can help me with part numbers for the rest of the caps or any other suggestions, it would be much appreciated


thanks so much in advance

[retiredcaps]

Re: Samsung Syncmaster 225BW

the Monitor will turn on but will turn off within 5 mins.

if you can help me with part numbers for the rest of the caps or any other suggestions,

1) We always ask people to post pictures of their own monitors because it is not uncommon for manufacturers to make revisions or even complete board changes and use the same model number. Even the smallest revision makes a huge difference.

2) Post pictures using the manage attachments feature and please do not post pictures inline as they slow down the loading of pages.

3) For best picture quality and clarity take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focused pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

4) Here is an example of the pictures we want.

https://www.badcaps.net/forum/showpo...94&postcount=1

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

thanks so much for your help

i uploaded the best pic of a few i took of the back side and if a better one needs to be taken, will do that asap

[retiredcaps]

Re: Samsung Syncmaster 225BW

i uploaded the best pic of a few i took of the back side and if a better one needs to be taken, will do that asap

We will need a picture of the logic board as well.

Does the lcd stay on loger than 5 min if the back cover is off?

Do you have a multimeter?

[alexanna]

Re: Samsung Syncmaster 225BW

thanks so much for your help

i uploaded the best pic of a few i took of the back side and if a better one needs to be taken, will do that asap

I don't want to sound this like I am beating this to death, but double check the soldering on the capacitors you have installed. Gently wiggle or rock the capacitors back and forth watch for any movement on their solder pads.
If you can try to take your pictures without a flash,It causes to much glare. The shape of the capacitors is interesting!
I guess it's your photo editor causing it?
Al.

[mockingbird]

Re: Samsung Syncmaster 225BW

I noticed you replaced them with UCC "SXC", "LXY" and a Panasonic. Did you keep the old capacitors? We need to see if you used the proper replacements. I can tell you right away that "SXC" is probably some old general purpose capacitor and is inadequate for this application.

Also, snap a picture of the logic board.

I repaired an LG Flatron L1710S and it would not work for very long, until yesterday, when I replaced every single last cap, also the primary, and those on the logic board, and now I have been using the monitor for 24 hours without issue (And it has much better color accuracy than that Chi Mei Viewsonic).

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

retook the pics and hopefully they are better

Does the lcd stay on loger than 5 min if the back cover is off?

oddly enough, when i laid it down on a flat surface, it would stay on a bit longer but would eventually turn off

Do you have a multimeter?

my Dad would and he was a Electrican for many many years, he did the soldering work for me

double check the soldering on the capacitors you have installed

yeah, i gave it back to my Dad and pretty sure he double checked it

The shape of the capacitors is interesting!
I guess it's your photo editor causing it?

yes, sorry if the pics look odd but i'm resizing them in MS Paint to fit attachment reqs.

Did you keep the old capacitors?

i didn't keep them

I can tell you right away that "SXC" is probably some old general purpose capacitor and is inadequate for this application.

Also, snap a picture of the logic board.

what is the SXC?, please lmk if i need to re-take any pics for better viewing

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

last pic was upside down? anyways, re-positioned it

[alexanna]

Re: Samsung Syncmaster 225BW

I have found that the 2 second to black can be shorter and a lot longer than 2 seconds.
The fact that with the panel laying flat it will stay on longer may be a clue. If you have any spare ccfls it would be worth a try to see if substitution of known good ones cures the problem. Measuring the inverter transformers is also important, the problem I have is I am not good enough to look at a picture and tell you what pins to measure.
I also cannot tell you the quality of the caps you used.
Al.

[retiredcaps]

Re: Samsung Syncmaster 225BW

Measuring the inverter transformers is also important, the problem I have is I am not good enough to look at a picture and tell you what pins to measure.

With power off and lcd unplugged, measure the resistance (ohms) between the 2 yellow dots. Do the same for red yellow dots. Report both.

[mockingbird]

Re: Samsung Syncmaster 225BW

Greyheart, your logic board looks fine. No need to change the capacitors on it, they're all polymer.

But your power board, when I said "SXC" look at the big red cap, it says "SXC" on it. Now look at the capacitors you replaced, we need the name and series of those capacitors to see if you got the right type.

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

With power off and lcd unplugged, measure the resistance (ohms) between the 2 yellow dots. Do the same for red yellow dots. Report both.

bought a Multi-Meter for myself and will have my Dad test it tomorrow

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

Greyheart, your logic board looks fine. No need to change the capacitors on it, they're all polymer.

But your power board, when I said "SXC" look at the big red cap, it says "SXC" on it. Now look at the capacitors you replaced, we need the name and series of those capacitors to see if you got the right type.

i see what your talking about and went around town looking to replace the Red one and the one next to it...unfortunately, neither Radio Shack nor Micro Center carry the Cap i need

can someone help me choose the right one from digi-key or somewhere else?

thanks guys and hope to get this thing running soon

[retiredcaps]

Re: Samsung Syncmaster 225BW

can someone help me choose the right one from digi-key or somewhere else?

Post the uF and voltage of the cap. Also, list the diameter and height of the cap in millimeters.

[mockingbird]

Re: Samsung Syncmaster 225BW

How can we tell you the right one if we don't know what was there before? You need to ask someone who has this board to tell you what comes there from the factory.

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

ordered three Replacement caps for the Two big (Red & Black) and the last small cap


got the parts numbers from the original thread about 225BW

checked with Multi-Meter and my Dad said voltage is fine


hopefully the caps will fix the prob *crosses fingers*

[retiredcaps]

Re: Samsung Syncmaster 225BW

checked with Multi-Meter and my Dad said voltage is fine

What about the resistance test as per post #10?

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

its alive!

my Dad replaced the other 3 Caps and it turns on...gotta see for how long but so far so good

thanks guys for all the advice and helpful suggestions


the color is a bit off (maybe a bulb issue?) but it is on and working

[GR3Y5H3ART]

Re: Samsung Syncmaster 225BW

hey guys,

so Monitor is on but flickers

i been reading that shining a bright flashlight will show if its still on

i did it and i can slightly see the display...it does stay on but i'm thinking its a backlight issue?

also, if i turn brightness all the way to 100 it stays on but flickers at 66?...i thought keeping it lower would be safer?

thanks again for all your help