Solved Toshiba Satellite laptop display won't turn on

November 3, 2016 at 01:49:20
Specs: Windows 7
After an attempt of repairing a sound socket on my Toshiba Satellite C850-D2K, the display won't turn on.
Before I replaced the socket by myself successfully, but this time it was just destroyed during an attempt to restore the contacts. So, I removed it. After that the display has not turned ON anymore.

I tried another RAM, all simple solutions like connecting laptop to an external display, pressing shift+F something, replacing the battery, pushing buttons, removing the bios battery, vacuum cleaning the machine, etc.

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November 3, 2016 at 03:12:16
Toshiba laptops in my experience have some major issues with their displays, the majority of screen or LVDS cables I replace are on Toshibas. What you'll need to do is make sure that the ribbon that connects the screen to the motherboard is connected correctly and firmly.

Also plug in an external monitor and make sure you get a display, if you don't then it could mean graphics card failure, if you do get a display on the external then it could be the cable or the screen.

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November 3, 2016 at 06:29:47
External display does not get a display, all the cables are connected firmly and correctly- the first thing I excluded.

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November 3, 2016 at 06:50:01
✔ Best Answer
if the external does not get a display then the problem is probably the graphics chip. Now usually what I do when I get these for repair is gradually heat the chip up using a heat gun, what this does is slowly reflow the solder under the chip allowing any dry joints to reflow and repair. This is often a temporary fix however iv had a lot of luck with it in the past.

My process for this is

Ensure you work in a clean environment and ensure you have an anti static wrist band on.

1) Remove motherboard from the chassis
2) wrap entire motherboard in tin foil
3) cut around the foil where the GUP is
4) using heat gun at a low heat setting heat the gpu for about 10 minutes
5) increase the heat and continue to heat for 10 minutes
6) if you have higher heat setting increase and heat for another 10

now I used to use a infrared thermometer for this process but have gotten used to it and can somewhat gauge it, I cannot remember the exact temperatures now.

Once you have performed this process let the motherboard cool down, I tend to leave it for 2-3 hours at room temperature.

I then rig it up on an antistatic mat and test, usually works first time around but can require another round of heating.

This is what I have done, and will do to repair this issue, others may give you other advice, but this has always worked for me and I have repaired many laptops with no display issues. Sometimes though the removal of the gpu is required followed by cleaning of old solder and new solder being applied - this method isn't one I have tried so cant really give you any guidance.

As this is very involved perhaps wait to see what others think.....

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