Black screen oshiba Satellite A300D-205

January 7, 2018 at 03:33:38
Specs: Windows 10x65, AMD Turion-X2 RM-74
Hi, I have a problem with a laptop Toshiba Satellite A300D-205, AMD Turion-X2 RM-74 North Bridge AMD RS780 / RS880-Radeon HD 3650. Turning it on seems to work but the screen remains black. At first I thought about the broken video chip, I did the test with a separate monitor but everything is black, then changing the memories the PC started normally, but once off it no longer goes. I unplugged the bios battery and start on giving bios error, press f1 and start normality. Occasionally it seems to work and then freezes at every reignition, (if it is restarted by the operating system does not give problems and the video card works well even under stress). In the end I guessed that there is a problem with a capacitor because if you turn on the PC with a black screen for 4-5 minutes and then force it off and then turn it on again, the PC works, what do you think? In your opinion, how can I identify the broken capacitor, or did someone solve this problem? Thanks so much.

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#1
January 7, 2018 at 06:59:56
"how can I identify the broken capacitor"

I don't know if that's the problem or not, but to identify a bad cap, all you generally have to do is look at them. Go to google images & search for bad laptop capacitors. Did you test the BIOS battery with a volt meter?


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#2
January 7, 2018 at 08:49:10
Thanks, battery tested at 3.1v, capacitors visually look good, I looked around on the internet and there may be a problem with the south bridge, at this point it is better to give up the repair. Thanks so much.

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#3
January 8, 2018 at 05:52:08
Hi Gigig,`google

toshiba black screen of death

The details you find may help, as this is a common :Laptop problem, often caused by overheating due to build up of dust and fluff.

Your fault sounds as if it is almost permanent, but not quite. If so, maybe your Laptop has a small separate graphics board that can be easily changed.

Good Luck - Keep us posted.


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#4
January 10, 2018 at 13:04:05
It has an ATI Radeon 3470 not separate but with the graphics chip soldered on the mainboard (BGA), it is useless to try a reflow of the chip, it is also possible a malfunction of the NortthBridge or a capacitor (but I am not able to detect it).
In another Toshiba model of the same series but which is equipped with Intel, the broblema was a "nec / tokin" capacitor that gave problems, the solution was to replace the Tantalum capacitor with other similar ones, but this AMD CPU has nothing of the same.
After carrying out various tests and about 20 "forced" ignitions, the PC has stopped booting, (while remaining on with the black screen), probably the damaged component has stopped working definitively.

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