Baffled by Improperly Grounded LCD on a Toshiba Satellite Laptop

Yes, indeedy. A cup of  mocha latte spilled on a Toshiba A75 sent it into the land of disrepair, and here is where I come in. The keyboard was just about useless and needed to be replaced as some keys took almost five seconds to bounce back after being tapped. I had a heck of a time getting the battery off the base because the latch was just about glued shut by the dry dairy mixture. Finally, when I was able to get into the motherboard itself, I could see the remnants of the latte. Swabbed it with plain water to dissolve the layer of dried milk, and then rubbing alcohol to finish it.

I needed to re-solder the DC jack anyways, so a proper clean-up was only the first of many steps to bring it back to life. The first attempt to re-assemble gave us indication that the motherboard was done, so we ordered a new one. I was pleasantly surprised the new one was under $50. I love eBay when it comes to finding spare parts. I continued to clean the rest of the bottom case, the palm rest and the battery well. I was glad to find out the battery had not shorted out.

Once the new motherboard arrived, I proceeded to remove the CPU, heat sink and fan from the dead board and installed on the new one. After the re-assemblage was completed, I popped the battery in, plugged in the power cord and initiated the launch sequence. Churr, tic, churr, a pop and silence. Yep, no image, no posting of the bios, nothing… nada. I thought perhaps the memory had been zapped when the latte first spilled, so I decided to start without any peripherals. No DVD-CDRW drive, no wireless card, no memory and no battery. Bare bones, baby!

Launch! Churr, tic, churr, pop. Power is on but nothing on the screen, again, not even the bios is posting. Could it be a bad board? I hate it when that happens! So, i removed the power button cover, perhaps it was getting the power switch stuck. Inspected it for signs of the killer latte, but it was clean… hmmm… removed the keyboard and put the old keyboard on, perhaps the new keyboard was an issue, but if that was the case, it should still boot to the bios and show a warning about a failure to find  the keyboard.

So, I remove the LCD bezel thinking that perhaps the inverter board on the LCD has gone bad… as I look for signs of the deadly latte, I disconnect and re-connect the inverter board and try to power up but nothing happens. I push the LCD back a bit and voila! It starts, but it gets stuck on the BIOS loading screen, so I press the F2 key to launch the BIOS set up screen but nothing happens either. The keyboard does not work. I decide to re-adjust the screen and push it back a little, and lo and behold the BIOS set up screen loads. The time is all wrong, so I try to set the BIO to the correct time and date, but the keyboard does not work. I try to adjust the LCD screen once again and push it back a tad, and the time begins to scroll. I let go and it stops. Whoa!  I try it again and the numbers on the BIOS clock begin to scroll! Wait a minute, what’s the big idea?

I do a quick Google search for shorted LCD screen on a Toshiba and sure enough, there is an obscure quote on a dis-assembly manual that the LCD is improperly grounded. It was not a bad motherboard, nor a bad inverter board. It was an improperly grounded LCD cover. Dang! Mystery solved. Now I have to double check all the foil tape on the base board, the palm rest and the LCD cover. I hate that!

So there you have it. One other community forum suggested removing the battery, unplugging the power cord and pushing the power button for 60 seconds to completely discharge the faulty ground. It appears to work for some, but it did not work for me. I am off to foil away…

About computerdoctora

Sylvia started designing websites in 1996 when ICQ was all the rage. Architecture and Planning took center stage while she honed her project management skills on large urban development projects. She translated her project management skills to the entertainment industry for a season through Act One, Hollywood Above the Line. She is now focused on her consulting work as an Architect and an Urban Planner.
This entry was posted in Laptops and tagged , , , , , , . Bookmark the permalink.

14 Responses to Baffled by Improperly Grounded LCD on a Toshiba Satellite Laptop

  1. Elisha Olmstead says:

    Thank you for sharing your experience here. I really needed this info.

  2. Jaylan says:

    Right on-this helped me sort things right out.

  3. Hayle says:

    This has made my day. I wish all postings were this good.

  4. Linus says:

    Thanks for that awesome posting. It saved MUCH time 🙂

  5. fat baby says:

    I’m not that much of a online reader to be honest but your sites really nice, keep it up! I’ll go ahead and bookmark your website to come back later on. Many thanks
    fat baby

  6. see here says:

    Great blog Yes, this is a insightful image! This blog is just what I was needing help with, thank you for sharing! hoping there will be some posts about best online deals. Going to have to share this with my friends!

  7. scrapebox backlinks service says:

    This is a excellent site, will you be involved in doing an interview about just how you created it? If so e-mail me!

  8. laptops says:

    I think one of your commercials caused my browser to resize, you might want to put that on your blacklist.

Comments are closed.