Hardware toshiba sat pro L300 no display

johnny bravo

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hi guys - got a toshiba laptop pro l300...i got this from a mate at work who asks if i can fix it for him or tell whats wrong..anyway, no hard drive or memory, so i put in 2gb of ram..the laptop starts up and powers up fine, nothing on screen as its a black screen, no beeping noises of any kind..hooked it up to external monitor, still no display...any ideas whats wrong or cud be wrong...do i need a hard drive in their in the first place to boot up?...cant get into bios either by tapping the f2 key on start up..cheers
 
hey @johnny bravo fixed one last year same problem, I said it one of two things like nistleboy says faulty gpu chip (motherboard) or the cpu so i gave the the chap the two options, a motherboard new 90 quid or cpu for 9 quid second hand, could have maybe got a new motherboard for less second hand but anyway he went for the cheap option which i agreed with wasn't losing too much money if it wasn't the cpu, but in this case it was new cpu in and it fired up. so nice cheap fix for him :)

Focus
 
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The CPU is a slot in part and can easily be changed providing your comfortable with opening up your laptop, although some are windowed making the task much easier.

The Gpu is usually a Bga (ball gate array) package and requires expensive equipment and knowledge to repair correctly, there are cheap dirty methods ie heat gun/household oven etc which offer a short term re-flow, but these can also cause further operating issues on multi layered Pcb/mainboards.

Essef
 
Is it hard to replace cpu?...

well I don't find it too difficult but others might, all laptops are different some are easier than others :)


It snot necessarily that the GPU is faulty, it might just need need reflowing.


yeah could be a few things, i would say that it isn't to easy to do re-flowing but then again i have never done it :)


end of the day its a process of elimination, what to do first , and is it really worth it? I could be a good learning curve but could also be a disaster :(

Focus
 
hey @johnny bravo fixed one last year same problem, I said it one of two things like nistleboy says faulty gpu chip (motherboard) or the cpu so i gave the the chap the two options, a motherboard new 90 quid or cpu for 9 quid second hand, could have maybe got a new motherboard for less second hand but anyway he went for the cheap option which i agreed with wasn't losing too much money if it wasn't the cpu, but in this case it was new cpu in and it fired up. so nice cheap fix for him :)

Focus

I had the same laptop with the same problem and it was the cpu must be a common fault
 
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ok so it may be the cpu...seen them on the bay , seem chaep enough to try to see if it is the cpu...anyway how do i find what chipset my cpu is ?..the model number of toshiba laptop is toshiba satelitte pro L300-27H part number PSLB9E-062007EN.....It has the Intel Core 2 Duo T5870 2.0Ghz, seen some the same but shall i get the same or which higher spec can i put in the laptop ?.
 
I,d pull the CPU to identify it correctly M8, i probably have one in the parts drawer but im not home until Thursday, as for upgrading to a faster CPU just go to the Tosh support site find your models manual and it will state in there what your main board is capable of running.

Essef
 
well spent a few hours today, managed to get laptop working on external monitor, changed ram etc...anyway i cant get into the bios as there is a password set for it...dont know the password...tried to reset the password by using the shortening of the b500 points under the meory module but didnt work..any ideas how to reset or remove the password..tried hirens noot cd , that didnt work...windows 7 still boots up and i can use windows as normal, just cant get into bios to change settings etc..due to password..
 
Information:

Follow these steps to remove / disable the BIOS (CMOS) Password on the Satellite L300 / L305 / L300D / L305D models:
1. Turn the computer OFF, if it's on.
2. Disconnect the AC adapter and remove the battery.
3. Remove the memory module cover, on the bottom of the computer.
4. Remove any memory modules that are installed.

go to the link to see picture

http://www.csd.toshiba.com/content/support/bulletins/su2044812...ilm-06.jpg

5. With the computer oriented as in the photo above, grasp the Mylar film at the upper left corner and peel it to the right -- far enough to expose the B500 solder pads (see photo below). Attach a 4" long piece of tape to the underside of the Mylar film. Do not remove the film completely, because it may be difficult to re-attach it correctly.
6. Insert one of the memory modules into the innermost socket (at left).
7. Secure the tape to the computer's case, as shown below, to keep the Mylar film from covering the solder pads.

go to the link to see picture

http://www.csd.toshiba.com/content/support/bulletins/su2044812/009.jpg

8. Reconnect the AC adapter.
9. Short the B500 solder pads on the system board. Needle-nose pliers or a flat-blade screwdriver works well to short them.
10. While continuing to short-circuit the solder pads, turn the computer on, and continue shorting the pads until the Toshiba Logo Screen disappears. If the password has been successfully removed, the computer will not display a BIOS password prompt before starting Windows or another OS.
11. Shut down Windows or other OS, making sure the the computer turns off.
12. Disconnect the AC adapter.
13. Remove the memory module and re-position the Mylar film over the system board.
14. Re-insert all memory modules.
15. Re-attach the memory slot cover.
16. Re-insert the battery and connect the AC adapter.
17. Restart the computer to verify that the password prompt no longer appears. If it does still appear, then repeat this procedure, starting with step 1

For toshiba, its really an official procedure made in toshiba standard labs......it works 100% as i have tested many times and it works......some times people burnd the motherboard because they dont use proper antistatic device and they burn motherboards with discharge....

If this procedure doesnt work with a flat headed screw driver use a paper clip or something metalica that short two points of B500 pads.....

You can make a solder bridge - two points with a fine iron tip





Essef
Ps A cut n paste job so not my work and untested but worth a try.
 
thanks, thats the link i tried several times but will try again seems straight forward enough but will have another go...
 
It should work M8, if memory serves me right it took a couple of attempts the last time i did one so just persevere with it, and at least you know the CPU is ok.

If you can get the Part number of the rear of the LCD or post a picture ill have a look at my spares i may very well have one ?.

Essef
 
lol..result it worked ! first attempt just done, tried it many times yesterday after work, probably was knackered ..so thought id do it just now and it worked first time..great..now to remove the screen....will post back..
 
all working now, turned out that the inverter was faulty replaced it and screen is fine...

@Eseef thanks for the screen offer.....wasnt the screen after all lol...
 
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