Question about Sony SDM-HS73P 17" LCD Monitor

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Will not retain screen image. Flashes the content when you push the on/off button and is clearly projecting data, but just in flashes.

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  • jmccord_arch May 25, 2011

    Are the backlight tubes in my Sony SDM-HS74P monitor replacable or is the unit e-waste?

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  • Sony Master
  • 1,583 Answers

It appears you may have a bad backlight. If you can see the picture content with a strong light shining at an angle to the screen while it is dark, then it is definitely the backlight. Most sets shut down shortly after getting a failure signal from the backlight inverter although you do not mention that happening.

The backlight uses two or more Cold Cathode Fluorescent Lamp (CCFL) tubes, and they'll have the same flickering as a failing standard fluorescent tube. If the light has a pinkish cast to it, this is a common sign that one or both of the tubes is bad. You may see the flashing on the top or the bottom and the other half of the screen will be dark; this means one tube is dead and the other is dying.

Posted on May 24, 2011

  • Paul Bade May 25, 2011

    The tubes are replaceable, but they aren't easy to get at. Typically, after you remove the back of the monitor, you look for the pink and white (sometimes blue and white wire pairs going from the inverter to one side of the top and bottom of the LCD panel. These go to the tubes. Sometimes, all you have to do is remove a screw next to where the wires go into the panel and you can slide the tubes out with their reflectors. Other times you have to remove the metal frame pieces on the top and bottom edge - the tubes are inside these. Be careful - this tubes are very thin glass and contain mercury vapor.

    Now for the really tricky part: the wires are soldered onto the tubes, and you cannot apply heat to the leads on the new tubes for more than three seconds at time because doing so will damage the seal around the leads and ruin the tube. That means you need a good soldering iron and 63-37 tin-lead solder (low melting point). If you are not sure your soldering skills are adequate to the task, at least one vendor (see below) will sell you tubes with new wiring attached for an extra fee.

    I usually buy CCFL tubes from LCDParts.net. They have a decent Tech Support page detailing the replacement process. You can find the replacement tube either by size (length and diameter in millimeters) or by the model of the LCD panel (look for the sticker on the back of the panel inside the monitor. The price for tubes for a 17" monitors is generally $12 or $13 each, and you may have four tubes in a high-brightness monitor. I recommend replacing all of them at the same time; if one is dead of old age, the others are just as old and will go soon.

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