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Dell monitor keeps turning off...

I ran across another thread on this website describing a problem similar to mine and I was hoping you might be able to help me.

Here is the link:

Following the suggestions, I took the monitor apart and was fully prepared to replace transistors, capacitors or whatever but I can't tell which ones to replace. There's nothing that looks "obvious." I took a few pictures and was wondering if someone might notice something that jumps out.

Incidentally, my monitor is about 4 years old (one year PAST the warranty...GRRRR). I did try hooking the monitor up to another computer and it does the same thing (goes out after about 2 seconds). I tried the flashlight test but couldn't see anything.

Honestly, I 'm getting ready to throw the darn thing out the window and go to Wal-Mart to buy another one as someone else suggested. In last two weeks, sometimes when I turn computer on the monitor is just a black screen and it flashes in time with the on off button. Sometimes it will come on and do fine. Sometimes it goes off while I am in the middle of something. Sometimes I can shake the monitor a bit and picture will re-appear. It is getting very annoying. It is 4 months out of warranty. I am thinking I may need to buy a new one.

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The problem you are experiencing is quite common, however the solution can be expensive and frustrating if you are not sure what you are doing. The problem is due to usually 1 of 2 things but the result is the same. The result is that the H.O.T. (Horizontal Output Transistor) is blown or severely damaged and needs to be replaced along with the item that caused it to go bad to begin with. Note: sometimes just the H.O.T. transistor can be replaced and it will work ok (this is rare and due to just being over-used).

The problems that caused the original issue is either the H.O.T. Transformer (a black device with heavy red wire insulation going between the mainboard and the picture tube with a wide boot on it). The other main culprit is the picture tube itself that will internally arc between the pins on the end of it.

These devices develops internal shorts that wipe out the H.O.T. transistor which is mounted to a heat sink.

None of your pictures show this board (it appears to be the same 2 boards in different poses). In your case it sounds like the picture tube is at fault and not worth repairing.

One other possibility is just poor soldering on the main board but this is extremely rare fault.

Hope this helps!
Rich Lilja

Posted on Nov 26, 2008

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