I was changing the screen inverter not realizing that the laptop was on. When I disconected the inverter the laptop shut off and now It will not boot. It will turn on for about 3 seconds but then it will shut off. When connected to an external monitot it workd fine. I changed the inverter but still shuts off. Any suggestions.
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Possible loose connection from the inverter to the screen. you can try pushing the edges of the screen cover towords the center working your way around the problem area especially. But it could be just a bad inverter. Can you hook it up to external monitor? That will tell you if problem is before or after inverter.
Try using a flashlight at different angles and let me know if you can see a faint image of the desktop If so It is your inverter board that needs replaced. http://www.google.com/products?q=IBM+ThinkPad+R52+inverter&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=X&oi=product_result_group&resnum=1&ct=title
It is unlikely to be the cmos battery as there are signs [music] that your laptop is booting - shine a light into the screen if you can see an image but it is very dark then it is likely that the screen backlight is not working. If this is the case the most likely causes are a faulty inverter or a faulty screen cable - both can be obtained as a kit quite cheaply on ebay if you have the ability to fit them.