Toshiba Satellite U series U400 Not Turn On

Details:

Pressing The Power Button Of The Toshiba Satellite U400D 200 The LED Light Turns On But The Screen Stays Black

Cause:

The ATI Radeon Graphics Chip Does Not Work

Solution:

Rework Processor ATI

TOSHIBA Satellite U400D 200 PSU48E not turn

As you can see from the following photos, the PC practically lights, including LED Power. The fans in some cases also run, and seems to go perfectly .. mah after a few seconds you realize that the screen remains BLACK ..

video problem TOSHIBA Satellite U400D 200 PSU48E

TOSHIBA Satellite U400D 200 PSU48E black screen

Among the many tests I did, before working on the graphics processor, I tried to put pressure slightly in the area below, near the power connector DC Power.

Virtually putting pressure on this point (see photo below) I noticed that the pc sometimes is on. I deduced that it was a problem of welding, so I’m prepared to make a nice reflow, also because this model does not have the ‘famous’ capacitor NEK / TOKIN that nuisance to other Toshiba models alike.

repair Satellite U400D 200 PSU48E

Then dismantle everything that is placed on the underside of the computer: hardware, hard drives, ram bancheti, lids, battery, WiFi card, burner, etc.

toshiba Satellite U400D 200 PSU48E

wifi toshiba satellite U400D 200 PSU48E

disassemble toshiba satellite U400D 200 PSU48Etoshiba satellite flat U400D 200 PSU48E

Detach the plastic rod horizontal present above the keyboard. It ‘just stuck.

open toshiba U400D 200 PSU48E

We dismantle the keyboard …

keyboard toshiba satellite U400D 200 PSU48E

Svitiamo all screws that we can see … we detach flat and connectors … finally helping us with some plastic instruments detach the upper shell of the pc …

reflow toshiba satellite U400D 200 PSU48E

And here we are in front of the motherboard. Detach all flat, pins and screws that hold it fixed to the base.On this model it is not necessary to remove the display. Time gained …

motherboard toshiba satellite U400D 200 PSU48EWe raise the mainboard and estraiamola.

mainboard toshiba satellite U400D 200 PSU48E

And here’s the motherboard to complete. In the picture you see I have not taken a lot of stuff, like banquets memory and battery. You must disconnect ALL to do a rework of the GPU.

We arrange to remove the heatsink and fan.

toshiba satellite fan U400D 200 PSU48E

sink toshiba satellite U400D 200 PSU48E

In the photo below, under the CPU are the ‘bad guy’, our AMD RADEON that needs to be revitalized …

We provide a clean everything, removing the thermal paste, turn on the plate for preheat, we shoot a lot of NC-559 or other flux under the graphics chip and try to make a reflow temperature by referring to the diagrams for this BGA.

TOSHIBA Satellite U400D reflow

TOSHIBA Satellite U400D preheat

TOSHIBA Satellite U400D reballingTOSHIBA Satellite U400D repair

If we really want to do things for her going dissaldiamolo completely redo and also possibly with the ball of tin tin containing lead: below certain stages of a removal of the graphics processor and a remake of the balls of tin.

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reball bga sony acer asus toshiba

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reball bga sony acer asus toshiba

reball bga sony acer asus toshiba

reball bga sony acer asus toshiba

reball bga sony acer asus toshiba

Personally on this model and with this GPU have been very successful with a reflow: the important thing is the initial state of the component and everyway … I give always a guarantee!

CPU GPU toshiba satellite U400D 200 PSU48E reballing

Then replace the thermal paste with a new one, we clean the fan and heatsink and richiudiamo all …

I try a first power because I want to understand if everything is ok before re everything pretty well … ET VOILA ‘!! Lights up !! And thank goodness …

toshiba satellite U400D 200 PSU48E repaired

toshiba satellite U400D 200 PSU48E reballing

And here quĂ  our TOSHIBA Satellite U400D 200 PSU48E working perfectly !!

repair toshiba satellite U400D 200 PSU48E napoli

After several tests (which lasted a week …) I have concluded that the repair was successful and so I returned the PC.

repair toshiba satellite U400D 200 PSU48E napoli

 

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