Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

[alexanna]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

This monitor looks to have six ccfl tubes and six transformers.
Could this be a monitor we could plug one ccfl at a time,to see if anything jumps out at us?
[Totally failed bulb,Bad transformer or circuitry ect. ect.]
Al.

[Minathevi]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Can you please give us a top/bottom photo of the entire power board?

Delivered

[jetadm123]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

My apologies. The backlight turns on and off intermittently like JoseJX described in his post. I can hear a faint buzzing, but none of the caps appear bulging and there's no change to the sound that I can hear when the backlight turns off and back on.

Can you please give us a top/bottom photo of the entire power board?

[Minathevi]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Please clarify. Once the thread runs 3 pages long with 5 or 6 posters, it gets confusing.

My apologies. The backlight turns on and off intermittently like JoseJX described in his post. I can hear a faint buzzing, but none of the caps appear bulging and there's no change to the sound that I can hear when the backlight turns off and back on.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

I'm having the exact same issue with my Westinghouse.

Please clarify. Once the thread runs 3 pages long with 5 or 6 posters, it gets confusing.

[Minathevi]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

I'm having the exact same issue with my Westinghouse. It also has the same model power supply as JoseJX. I've included a picture of the board with one of the heatsinks removed. I don't have access to my soldering station at the moment and I'm not about to break the other one off.

[jetadm123]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Here are the higher resolution photos, sorry, I thought the directions said to make them lower resolution.

I don't think I can remove the heat sinks easily. They're riveted and soldered on. I'd prefer to hold off on bending them away unless it's required.

I do have a multimeter, but the LCD hasn't turned off since I took the back of the screen off. The period that it does turn off is really short as well, less than a second or two, so I think it might be tough to get a measurement.

Thank you!

This definately falls in the category of the worst power supply design! Those heatsink covers make it extremely difficult to troubleshoot the supply, since we can't point out components for you to test. We also have to see the top portion of the board to relate it to what's on the bottom portion of the board. If you could take a snapshot of the the heatsink assembly, maybe someone can suggest a less painful way to remove it.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Perhaps it was just a loose connection? I'm still concerned with the power supply whine though.

I did suggest to look at your solder connections. The whine could be a bad cap or from the transformer. Others have more expertise in identifying this.

[JoseJX]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Hmm, maybe it's not heat related, I'm a bit confused now? I tried heating the power supply with a hair dryer, my infrared thermometer reads 70-75C, but it's still not turning off. Sorry, I'll try again later tonight if you have another idea. Perhaps it was just a loose connection? I'm still concerned with the power supply whine though.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

I do have a multimeter, but the LCD hasn't turned off since I took the back of the screen off.

Maybe you can carefully use a hot air gun/blow dryer to warm up small areas at a time?

[JoseJX]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Here are the higher resolution photos, sorry, I thought the directions said to make them lower resolution.

I don't think I can remove the heat sinks easily. They're riveted and soldered on. I'd prefer to hold off on bending them away unless it's required.

I do have a multimeter, but the LCD hasn't turned off since I took the back of the screen off. The period that it does turn off is really short as well, less than a second or two, so I think it might be tough to get a measurement.

Thank you!

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

The brown capacitors appear to be Chemi-Con (the empty rectangle logo). I don't know the brand of the capacitors on the inverter board.

Yes those are United Chemi-con caps. They are a reputable brand capacitor.

The ones on the inverter look like Capxon? If they are Capxon, they are not so reputable.

But before replacing anything, let's do the voltage measurements and some other tests.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Hi everyone! I too have a Westinghouse L2410NM 24" and the back light has begun turning on and off intermittently.

Do you have a multimeter?

When the lights turn off/on intermittently, can you measure the secondary voltages to see if they are fluctuating? The voltages to the inverter will either be 14.5V or 24V DC.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Here are the requested photos, if you need closer or higher resolution photos, I'd be happy to oblige.

1) We prefer photos in this format. 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.

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

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


3) Can you remove the heat shields as well so we can see the caps below?

[JoseJX]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Here are the requested photos, if you need closer or higher resolution photos, I'd be happy to oblige. There are two other capacitors on the inverter board, but they appear the same as the photo provided here.

The brown capacitors appear to be Chemi-Con (the empty rectangle logo). I don't know the brand of the capacitors on the inverter board.

Thanks again for your help.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

The whine appears to be coming from near the transformer.

Should I just replace all of the capacitors in the power supply as a precaution? I can supply photos if it would help

Yes, please provide clear focused pictures using the managed attachments button. Please do not post inline.

Please list the brand of capacitors in your lcd.

Check your solder joints on the backside.

[JoseJX]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Hi everyone! I too have a Westinghouse L2410NM 24" and the back light has begun turning on and off intermittently. I can also hear a high pitched whine from the power supply, but I cannot see any obviously bad capacitors. I suspect that there is a heat issue since running it with the back off seems to have eliminated the problem. Using an infrared thermometer shows temperatures in the power supply at 50-60C. The whine appears to be coming from near the transformer.

Should I just replace all of the capacitors in the power supply as a precaution? I can supply photos if it would help, the design is slightly different than the version shown here with fewer capacitors under a solid voltage regulator heat sink. Should I replace the ones on the inverter board as well? Again, I don't see any bulging and I can't hear any whine from these capacitors.

Thank you!

[romansroad]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

take a look at Mouser....sometimes different supply than Digikey.

[jfrick]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

Hello All,
I too have a Westinghouse L2410NM 24" LCD, it whistled for about a week and now the screen is black. The suspect capacitor is with bulging cap is a CapXon 2200uf 10v.
Per advice on this thread I plan to replace all capacitors that are under the heat shield (pictured in Renesis13's post) but I'm having a hard time finding a 1500uf 16v .394 x .827
from Digi-Key. Any advice will be appreciated.

[retiredcaps]

Re: Westinghouse L2410NM 24" LCD power goes on and off, blue light flickers

So, I'm a little bit embarrassed to even post these photos, so you'll just have to realize that I suck at soldering.

Practice really does make you better. My first couple of soldering jobs looks like yours.

You can see that I left solder across 2 of the channels, but it looks like they are part of the same electrical circuit. Does anyone think this will be a problem?

It should be okay. If you remelt the solder and use a solder wick or desolder pump, it should get all removed.

$5 in parts and it's back to life!

Great feeling isn't it. $5 saves a 24 inch monitor.