After I initially installed mod, I checked everything was working 100% - as usualy, this is my third mod.
After completion, I found no backlight, image is fine on a dark display.
So I checked sense wire, all solderings, all possible shortcuts - nothing found. Measured iv LVDS tape is OK, checked display with external controller board - everything seemed to be normal.
So I decided to put original LVDS display back - and voila, also no backlight, but working image is barely visible in the background.
Any ideas what to check next? Seems to me like some fuse was broken or something similar happened.
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It's a 3A/32V Fast-acting one.
Either replace or piggyback-solder a new one on top of it.
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EDIT: both F2 and F6 fuses are OK, also getting 3.3V voltage on them. But no voltage on pins 27 and 28 on LVDS connector. Capacitors C140-C142 are not shortned, I have not found any physical damage on te board itself. I will not find the broken spot, I will make it a dirty way, getting 3.3V directly from F2 to LVDS
EDIT2 - 3,3V is provided to LVDS correctly, I measured bad side of the connector. Then backlight control must be wrong.
EDIT3: BACKLIGHT_ON (pin 4 on LVDS) has also 3.3V when board is powered.
WINNING EDIT: blown F1 fuse - 12V for backlight power, VBL20 circuit, pins 1&2 on LVDS
I made a shortcut for testing, works OK. I have no idea when it was blown, but I learned a lot of about reading board layout diagrams and notebook schematics
Is it possible to get a longer cable for the screen, such that I can connect the screen directly to the adapte board? I don't know what's the type of connector on the adapter board.
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