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L1900e dark backlight

I've got a problem with L1900E, when i turn it on the logo shows up (very dark) and dissapear, and i have to wait a few minutes to see anything. Picture is blinking and it's barely visible. I have to wait 30 mins to see desktop, but it's still too dark. Using forte manager doesn't seems to change anything about brightness. I'm equipped with miliammeter and frequency counter, i don't have an oscilloscope Is it CCFL need to be replaced or it's an inverter problem?

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  • Contributor
  • 28 Answers

1st try to check circuit that is operating CCFL, otherwise replace CCFL , it does not look like ccfl problem

Posted on Apr 12, 2014

  • Lukasz
    Lukasz Apr 12, 2014

    You need to be more specific, i dont have even a circuit diagram of the inverter so i have no idea what i should be looking for

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4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: Viewsonic VX900 blank screen

Here is a pic of the fuses on the inverter board for a Viewsonic vx900, you can visually inspect them as well if you do not have a volt meter. While visual inspection is not 100% reliable, usually when these are popped you will see the red line across them is black or broken.
82dd678.jpg

Posted on Jan 03, 2009

BoiseLCD
  • 63 Answers

SOURCE: LG L1900E flickering after cold start

This is probably due to a bad solder joint somewhere. Bad solder joints can effect a unit in the reverse also. IE works at first and then dies after it gets warm. Think about how metal expands when it is heated. And contracts as it gets cold. If there is a hairline fracture on one or more component joints, this would cause it to not have such a great or solid connection when it is cool, or contracted. As it gets warmer, the solder expands therefore filling the void and giving it a good connection.

Regardless, it will likely only get worse over time. If you're handy with a soldering iron, pop it open and reflow all the joints. Especially the ones on the transformers and copper coils. Best to hit them all, excluding the tiny surface mount devices.

If you need further help or if you'd like to have this, or any other LCD monitor repaired for a flat rate fee of $40, please visit my web site http://BoiseLCD.webs.com, or email me at cjmclellen@msn.com.

BOISE LCD - LCD Monitor Repair
Chris McLellen
(208) 891-9117
cjmclellen@msn.com
http://BoiseLCD.webs.com

Posted on Jan 03, 2009

sleepy_user
  • 140 Answers

SOURCE: TFT VE710b backlight needs 20 Minutes to light up fully.

The inverter is yoru problem. It takes a while to build up the voltages that is needed to drive the bulbs.

Unless you are operating the monitor in temps below around 40 degrees F... temp is not a factor.

Your prob getting ready to buy a new one. Your inverter(s) are on thier way out.

Posted on Jan 23, 2009

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This is probably due to a bad solder joint somewhere. Bad solder joints can effect a unit in the reverse also. IE works at first and then dies after it gets warm. Think about how metal expands when it is heated. And contracts as it gets cold. If there is a hairline fracture on one or more component joints, this would cause it to not have such a great or solid connection when it is cool, or contracted. As it gets warmer, the solder expands therefore filling the void and giving it a good connection.

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