Mag 17" goes black, changing capacitors but 4 are... (by 2 users)

posted by majorgeek on Apr 04, 2008

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First of thank you for giving the info on how to take off the bezel. My screen(Mag 17" 700p) also goes black(the power light is still on) until i turn it off and then turn it on again. And it doesn't stop from doing it.

Now I'm just a little confused on the capacitors. There are 2ea 470uf and there are 4ea 1000uf.

Am I supposed to replace the 1000uf with 470uf? Also where the 2 yellow square things are it seems to be blackish around the area. I have a picture here. I am concerned that something is burning.

http://img171.imageshack.us/img171/2405/0104080526sa4.jpg

Any help would be appreciated it.

Thank you kindly.

Comment by majorgeek, posted on May 07, 2008

Thank you both for your help. I replaced both the 470uf and I'm having a hard time finding the 1000uf. I have read through this forum and as far as I can tell all 6 capacitors should be 470uf. But in my case they are not. I know someone before me had tried fixing this and only lasted a while. My other concern was the Power Inverter Board. It looks really burnt around the inverters. So I am not sure if that is what needs replacing or if the capacitors(1000uf) are too much? And if thats the case I might as well throw it out because that part is hard to find. I will keep searching for those capacitors. Thank you for all your help. And if there are any other solutions please let me know. Thank you kindly.

I have the same problem.

1 Other User Has The Same Problem

Comment by nightowel, posted on May 01, 2008

I have had the same problem with a 19" widescreen MAG, I replaced two caps on the power supply board that were burnt and bulging, then I came across an easy solution, that fixed my problem, as soon as you turn the monitor on, hit the menu button, the first option should be brightness, quickly turn that way down to like 20 or so, after i did that my monitor has stayed on.

Best Solution

posted on Apr 16, 2008

Mark_Webber

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Guru
Rating: 87%, 245 votes

Replace the caps with the correct picofarad ratings. IE if you take out a 470, then put a 470 back in. Also note the voltage on them. You can go higher, but do not go lower. So if they are 470 16v (16 volts), then you can use 470 25v (25volts) etc. Just don't get them mixed up.
Best option is to replace all of one rating, then all of the other. Also note the stripe on the side of the capacitor. This indicates negative and should match up to a circle printed on the board (probably hidden under the current capacitors) with a light side and a dark side. The negative (stripe) on the capacitor goes to the dark side of the circle.

The burn marks are quite common. It's from heat being transferred through the PCB to dissipate it.

If you are unsure about any of this then just post back here.

Comment by Mark_Webber, posted on May 07, 2008

If you cannot locate 1000uf then go a little higher. 1200 or even 1500 will be fine. Just remember the voltages need to be the same or higher then the original rating.

The burn marks around the inverters are nothing. They just get very hot when operating.

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