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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Laptop LCD problem inverter or backlight or video board ?
I have a Compaq Presario 1700t laptop, the 13.3" LCD is not functioning
correctly. When I turn on the laptop, the LCD is very dark but still can see the dim image of the Windows is booting up. Then I research on the problem and opened the case and find the inverter is ALPS KUBNKM011A. I ordered the inverter from ebay and replaced the old inverter. However the problem still exist. I found there is no difference on the dim image whether plug in the inverter or unplug it from the montherboard. I tested there is 12v dc output from the red wire but nothing from white and green in the middle. Also, no voltage (no dc nor ac)from the socket where the pink wire supposed to plug in. Could anybody help me how to test whether the inverter or backlight or video board having problem? Thank you!! The inverter looks like this http://www.impactcomputers.com/198700-001-ib.html# |
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A common cause is the inverter, and or the backlight failing. These are best
to replace together. In the case of buying a used one, there is a good chance the one you buy is also defective. They only go so many hours and they have to be changed. With some displays, the backlight is an integral part of the display. In this case, both the inverter and complete display should be changed at the same time. I would not buy used parts, because they do wear out after a number of hours, and used parts have hours put on to them. -- Jerry G. ===== "kk" wrote in message oups.com... I have a Compaq Presario 1700t laptop, the 13.3" LCD is not functioning correctly. When I turn on the laptop, the LCD is very dark but still can see the dim image of the Windows is booting up. Then I research on the problem and opened the case and find the inverter is ALPS KUBNKM011A. I ordered the inverter from ebay and replaced the old inverter. However the problem still exist. I found there is no difference on the dim image whether plug in the inverter or unplug it from the montherboard. I tested there is 12v dc output from the red wire but nothing from white and green in the middle. Also, no voltage (no dc nor ac)from the socket where the pink wire supposed to plug in. Could anybody help me how to test whether the inverter or backlight or video board having problem? Thank you!! The inverter looks like this http://www.impactcomputers.com/198700-001-ib.html# |
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"kk" wrote in message oups.com... I have a Compaq Presario 1700t laptop, the 13.3" LCD is not functioning correctly. When I turn on the laptop, the LCD is very dark but still can see the dim image of the Windows is booting up. Then I research on the problem and opened the case and find the inverter is ALPS KUBNKM011A. I ordered the inverter from ebay and replaced the old inverter. However the problem still exist. I found there is no difference on the dim image whether plug in the inverter or unplug it from the montherboard. I tested there is 12v dc output from the red wire but nothing from white and green in the middle. Also, no voltage (no dc nor ac)from the socket where the pink wire supposed to plug in. Could anybody help me how to test whether the inverter or backlight or video board having problem? Thank you!! The inverter looks like this http://www.impactcomputers.com/198700-001-ib.html# If changing the inverter didn't fix it, the problem is probably that the CCFL tube is worn out, you can get replacements if you can get it out and measure the length. |
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