Hanns-G LCD repair – final post

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Please see the previous two posts on the same topic, repairing Hanns-G 19″ LCD monitor model # HQ191D before reading further.

Replacing the CCFL lights with super bright LED lights worked, but the screen was not bright enough. If there were lot more LEDs, it would have worked, but the space where these lights are inserted is really limited. Considering all this, I looked around and found overstock CCFL lights from http://www.ccflwarehouse.com at $4 each. I found 19″ lights that will fit into my monitor exactly and ordered 4 of them. Including shipping the total came to be $21.

These lights had wires soldered on them, but did not have plugs on them. I soldered the plugs from the previous lights on the new lights. But when I plugged one of them in, it was not coming on. I thought perhaps the lights were bad. When I plugged all four in, the lights came on, but only briefly. This meant that plugging just one light bulb, even if good, does not work.

100_9003Plugs soldered in

100_9004Paired up.

I was not able to keep the lights to stay on. Later on I realized that it was because there was no input to the monitor and the monitor was going into the power save mode. When I connected the monitor to the computer, the lights came on and stayed on.

One thing that I should have done was to keep the metal brackets that held the CCFL lights at the top and the bottom of the monitor. These metal housings that hold the lights shield the rest of the monitor from heat (and perhaps also from high voltage). Although the name Cold Cathode leads you to believe that the lights are cold, in fact they do get real hot. While I was testing them outside the monitor, a smoke came out of the scotch tape which was holding the two lights together. :)

100_9024Finished 1

100_9025Finished 2

As I opened and closed the monitor number of times, I connected the video connector backwards a few times. As you can see from the pictures above this was not helpful. About 1.75 inches from the right became permanently black (or at other times striped up and down). Another problem was two extremely thin blue lines running up and down always no matter what is on the display. In spite of these two problems, the monitor is still usable.

100_9033Power supply

100_9034Front view

As you can see from the pictures above the power supply is outside the monitor, and the lights are easily accessible. I am not sure if this is a good thing to do, however one advantage to this arrangement is in repairing another broken monitor. I could easily plug the CCFL lights from the broken monitor to this one to see if the lights are good, or plug the CCFL lights from this monitor into the broken monitor to see if the problem with the broken monitor is with the inverter. The point is that known good CCFL lights and inverter is easily accessible to compare against the broken monitor.

100_9035Stripes on the right

Note the problem on the right hand side.

Now that I had a second monitor, I wanted to connect it to my Linux desktop computer. That is a topic for another post.

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