Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

[devanny]

I've been reading all the threads on this power board. Apparently, my monitor has same problem as others, no display, solid blue light. There is a lot of discussion on the BN44-00175A about bad resistors being the problem, caused by the brown goop they use to glue them in place on the board becoming conductive. I haven't tested any of the capacitors or resistors yet but I suspect the resistors in the attached photo may be the problem as the brown goop between them shows signs of some arcing. Can anyone tell me the value of these resistors? The brown goop has covered up the markings on them as well as the number on the board so I can't tell what they are. Thanks for your help.

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

You can use alcohol to soften up all them glue on the board so you can remove them a bd be able to see the color code, I also see black arcing on the little blue cap caused by bad glue.
So far I cannot find any diagram for this BN44-00195A yet.

[retiredcaps]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Can anyone tell me the value of these resistors?.

I'm surprised you didn't find it mentioned in the megathread. 68 ohms for all three.

[devanny]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Thank you for the replys. I did read the megathread and saw the mention of the cluster of 68 ohm resistors on the bottom of the board that go bad. However, I thought that referenced the BN-00173A board, not the BN-00195A board I have. As you can see by the picture, the 195A has a cluster of 2 by the large capacitor. Sorry about the picture, it is the best I could do with the equipment I have.

[devanny]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

I took another picture of the affected area of the board. I checked both resistors. They are open. I'm trying to get new ones but the color coding on the resistor is confusing me. I'm reading the colors as gold-yellow-black brown. Gold as the first bar isn't making any sense to me. Comments would be appreciated.

[Undead]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Gold would be the last band not the first, it signifies the tolerance, gold being 5%. Brown, Black, Yellow, Gold, should be a 100K resistor at 5%.

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Those two are 100,000 Ohms 5% resistors, i think they are OK, recheck the resistance reading again.

[OniJon]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Those two are 100,000 Ohms 5% resistors, i think they are OK, recheck the resistance reading again.

Yea, 100 kohms.
This is nice tool to use if confused:
http://www.dannyg.com/examples/res2/resistor.htm

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

I would remove all the glues, especially the one that is burnt by the blue cap and see if it will fire up after glues are removed.

[devanny]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Thanks for all the good information. I like the tool. I measured the resistors. One measured 89K, the other measured 46K. Seem to be out of spec. I'll be removing the glues and see if I can get it to fire up.

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Those reading may be due to other components are in parallel with the resistors.

[Rtech]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Those resistors will only go higher than their rated value,not as low as you are measuring.

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

How can the value go higher if you have other resistors/loads in PARALLEL?

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Can I get good pictures of the bottom side of the board

[Rtech]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

How can the value go higher if you have other resistors/loads in PARALLEL?

Obviously not when in parallel, But normally as you are well aware these type of resistors increase in value if they fail.

[budm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Well from my 30 years of experience, I have seen it goes both way, shorted out or goes open. So I always test resistor or anything else out off the circuits.

[devanny]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Sorry I haven't followed up on this post. I put the monitor aside for awhile while working on other projects. As suggested in other posts, I cleaned the brown goop off of all the components on the board. That crap must have been very corrosive as many of the components show significant affects from it. I put the monitor back together and it still exhibits the same problems, solid blue power light, black screen.

I did find a service manual with schematics on another post. I will see if I can isolate the problem board by taking resistance and voltage measurements as other posts indicate the problem could be in the main board, not the power board. However, seeing the damage that brown goop did to some of the components, I'm pretty sure it will be a power board issue.

After I do the investigation, I will report he progress and post the pictures you asked for. Thanks for your patience.

[rtstorm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Hi, i have same board (BN44-00195A) and monitor worked for few days and then black screen. Did anyone resolve this problem?

[selldoor]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

There are hundreds of posts regarding this monitor -
Please list what tests you have done and what results you got.

Welcome to the forum-
We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back (in the same orientation) and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed

https://www.badcaps.net/forum/attach...7&d=1280167246

https://www.badcaps.net/forum/attach...6&d=1280167246

https://www.badcaps.net/forum/attach...4&d=1280167246

It will be useful if you can say what the supposed fault was and a bit about yourself - skills tools etc.

Please also update your profile with country and mains voltage

[rtstorm]

Re: Samsung 245BW - Power Board BN44-00195A - No display, solid blue light.

Hi, i have same board (BN44-00195A) and monitor worked for few days and then black screen. Did anyone resolve this problem?

i remove the 2 resistors, one is 100K and other infinite ohms, so i will replace them and let you know