LG Flatron

[selldoor]

Re: LG Flatron

OK - Pics have too much flash - need good light but not flash.
I have not seen this board before either .
You cannot test the capacitors properly with a multimeter.

Basic tests - with it all connected up and power to the set but switched off
Meter on 600 vDC CAREFULLY measure across the Legs on the BIG CAP.

Switch the power on then do the test again.

Next meter on VDC 200 list the voltages you get on the connector that goes from the power supply to the main board along with what it says they should be.
Example

PIN 1 12v 11.25v
PIN2 gnd 0.00
PIN3 pson 3.37v

[Macedopt]

Re: LG Flatron

Hi,

i could only post the photos today, hope there will be of any use, if you need anything more just ask.

the photos are very low quality but is the best i can manage, only have camera on phone. so sry.

Think if i replace all capacitors i will solve the problem? what about those ceramic caps i cant get them where i live. do i need to replace them too?

best regards

Andre Macedo

[smason]

Re: LG Flatron

To be honest, I don't think you can do much if any useful testing of the caps with the equipment you have, as you'd need to be able to measure the capacitance, and the ESR.

We'll know a bit more when you get the photos, then we can get you to measure a few voltages etc.

[Macedopt]

Re: LG Flatron

Hi,

Thks for the response, i will run this tests when i get home, aswell take care of the pictures to send you guys.

just one quick question, what values do i set to measure the caps on the multimeter, and what do i expect? can i test them "in circuit" or i need to desesemble them?

as for the cold joints, i resoldered what it seem to me a potential cold joint, altough the solder i used was of bad quality and things got bit dirty, youl see what i mean when i send you the photos.

thank you for all the help

regards

[smason]

Re: LG Flatron

I just looked at my repair log. I have repaired 10 LG monitors, haven't seen that particular model. The buzzing may not necessarily be caused the component that is buzzing, it may be caused by something else.
I would definitely check/replace the capacitors, especially if they're known problem ones like Samxon GF. And definitely check the solder joints, particularly around the transformers.

[Macedopt]

Re: LG Flatron

Hi,

ty for the quick response and the welcome greetings, i am at work rigth now and therefore can only send pictures of the board later, i used to have a good multimeter but my tool case was stolen and know what i have is those very basic multimeters, it cant measure caps doesnt have the Faraday option, can olny test them using the ohmimeter, but it isnt working why i dunno, maybe im doing something wrong.

As for the Display model it is the LG Flatron w2246s - BFW.AEUODPN

the component where i think the buzzing is comming is:

IT-007
EBJ55945505
DD 1023

Thank you mate for the time reading my post, it is most apreciated

Regards

[selldoor]

Re: LG Flatron

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.

[smason]

Re: LG Flatron

First. welcome to Badcaps!
Second, your English is fine.
Third, we'll need a model number, and some pictures of the insides of the monitor will help

Do you have a multimeter?

[Macedopt]

Hi badcaps community

Hope im not breaking any rules here, the thing is i got an LG Flatron 22" and it has the "2 sec to black" dissease, differing only that image doesnt appear even with flashlight or sun light.

I have tested the fuse, diodes, still havnt tested the caps and other components but i detected something strange and tought of asking you guys for a little help, the thing is that when i turn on the Display, i hear a buzzing in what i think its the transfomer part of the board, where the ccfl conect, so i ask of you what i should do in a situation like this, i mean i dont know how to test that component and i surely dont know what its name, its a square like thing.

Could some caps be the source of the buzzing?

I dont have any spare ccfl how can i test if it isnt the ccfl?

thank you in advance,

And sorry for my bad english