74 replies to this topic

[MedEvil]

But.. have you some link to those tools?

No, i would need to start looking, do you have a notebook with AWARD BIOS?

Oh, really I think on such these forum a lot of ppl as we are

Unfortunately, as you can see by the number of active members and the number of registered users, we are a minority!

[fabiobassa]

No, i would need to start looking, do you have a notebook with AWARD BIOS?

No, it is just a study, a learning purpose.

fabio

[was_jaclaz]

@Medevil

Check these:
http://www.circuitsp...rework-c-8.html
http://www.circuitsp...tgun2-p-71.html
http://www.circuitsp...ga-c-11_24.html
http://www.web-tronics.com/sore.html
http://www.web-troni.../noforsost.html

And compare with these:
http://gsmserver.com..._bga_nozzle.php
http://www.hakkousa....,...2409&Page=1
http://www.hakkousa....,...2409&Page=5
http://www.hakkousa....?PID=333&Page=1


I guess that you can get the "real" thing:
http://cgi.ebay.ie/H...oQQcmdZViewItem
for nearly half than the BOSCH you found....

jaclaz

[MedEvil]

No, it is just a study, a learning purpose.

fabio

Nice idea, but it won't work, because AWARD BIOS works very different from the others.
AWARD BIOS are modular, the others arn't!

[MedEvil]

@jaclaz
The nozzles are nice! I guess with one of those there's no need for alumium foil.

[fabiobassa]

hello MedEvil,
ty for the replay.


Tell me a thing:

a bios is written in C? assemble ? whatelse

Fabio

[MedEvil]

It used to be pure assembler, but i've been told, that since the BIOS size started to explode, even higher languages are used like C and even C++.

But that doesn't matter for you.
If you wanna fix a BIOS, it's always assembler.

BIOS patcher is one of the programs, which allow one to click together a 'own' BIOS.
Though you can't use it for your BIOS, maybe the code of the modules is useful to you.

[was_jaclaz]

@Medevil

FYI, I just re-flowed a nvidia go5700 (gone completely beserk) of a an Acer 1520 laptop, card like this one:


Used an old hot air gun I had (Metabo 2 kW - regulating knob in 5 grades, 2 air speeds), similar to this:
http://www.metabo.de...6_02005_42.html
and an el-cheapo multimeter with thermal coupler, this one:
http://www.sinometer...iles/MAS838.jpg

I made a protection for the "around" with some cardboard (modeled like a square box, similar to one of those nozzles) covered with aluminium foil, inserting in it, near a corner of the chip, the thermo coupler.

A couple of tests with the multimeter and the protection (without the component) showed me that I could get at about 10 cm distance around 180 C° with "low" speed and about 220 C° with "high" speed, with the knob regulated between 4 and 5.

Temperature ramp used:

• 5 minutes at low speed keeping temp around 150 C°
• 2 minutes at low speed (keeping gun a little bit nearer) making temp raise to 180 C°
• 30 seconds at high speed raising to 200 C°, topping at 215 C° and back at 200 C°
• 2 minutes at low speed lowering from 200 C° to 130 C°
• letting it cool naturally till room temperature

SUCCESS!

The freakin' card started working again.

And yes, exceptionally, I am allowed to (per)use the "walking like an Egyptian" thingy:


Statistically, this is the third succesfull attempt out of a total of five.

jaclaz

[MedEvil]

So instead of the IR thermometer you simply attached a sensor to the chip and you didn't even reached the recommended 230°C. And yet still success!?

Guess i will stop this stupid search for the right equipment and go with what's available in the store i buy all my tools.



PS: What went wrong with the other two?

[was_jaclaz]

So instead of the IR thermometer you simply attached a sensor to the chip and you didn't even reached the recommended 230°C. And yet still success!?

Yep , do you think it's a common thing to be (self-)authorized to use the "walk as an Egyptian" thingy?

Guess i will stop this stupid search for the right equipment and go with what's available in the store i buy all my tools.

Sure, you need a less German and more Latin approach , after all the stupid thingies were probably assembled by people (not their fault) that don't even know the difference between °F and °C, and there is "tolerance" and "deviation", what precision do you expect out of a thermo couple given for free with a 20 or 25 € multimeter?
According to it my body temperature (when holding the thermo couple between my fingers) was 30 to 32 °C, and since I am still alive a +- 5 degrees error it's probable. Is this fixed/linear or proportional?

PS: What went wrong with the other two?

Cannot say.

They were dead and remained dead after the "treatment".

Either the problem was not related to a bad soldering or the procedure was wrong.

Or, since at the time I did have the hot air gun but not the thermo couple + multimeter I simply heated them a tad too much.



But I have no idea how to troubleshoot the hardware of an electronic board if not checking with a ohmmeter the continuity of the (few) tracks that you can actually test or visually inspect the board and maybe see if a capacitor "popped out", so it is possible that the problem could be easily solved by a "real" technician, with the right knowledge and possibly the right tools.

Though the actual base is too meager to draw any conclusion, of the first three attempts (without the temp control) one was successful.
Of the two attempts (with temp control) two were successful.

On the other hand, in my time , I fixed more desktop motherboards than I can remember that simply had the 0.02 €/apiece keyboard fuse interrupted and were thrown away as "not repairable" by the actual (self-defined) "technicians".

jaclaz

[MedEvil]

Yep , do you think it's a common thing to be (self-)authorized to use the "walk as an Egyptian" thingy?

The question mark at the end should show my surprise, maybe should ahve better gone with a smiley.

Sure, you need a less German and more Latin approach

Guess you're right, but that's easier said than done for a German.

According to it my body temperature (when holding the thermo couple between my fingers) was 30 to 32 °C,

Ok, ok, we got it, you're a cool guy!

Cannot say.

They were dead and remained dead after the "treatment".

Thought might have been something obvious, like the board catching fire.

Though the actual base is too meager to draw any conclusion, of the first three attempts (without the temp control) one was successful.
Of the two attempts (with temp control) two were successful.

That speaks for a pretty high success rate, when done right.
How did you fix your heat protector to the board?

On the other hand, in my time , I fixed more desktop motherboards than I can remember that simply had the 0.02 €/apiece keyboard fuse interrupted and were thrown away as "not repairable" by the actual (self-defined) "technicians".

Yes, people who know their job are an endless source of joy to me too.

[was_jaclaz]

How did you fix your heat protector to the board?

I didn't actually "fix" it, I simply wrapped the outer loose ends of the aluminium foil around the edges of the board.

I could shot a photo of a board wrapped in aluminium foil to show you, but I have no more left after making my tinfoil hat:
http://en.wikipedia....ki/Tin_foil_hat

...and no, I won't publish an actual picture of me wearing it.



jaclaz

[MedEvil]

I meant the cardboard-tinfoil one to protect the components near the chip.
I guess with that much 'wind' blowing down, the least one wants is the hot air finding its way under the protection.
On the other hand, in the videos you provided, people were just ripping a hole into the foil, without taking further care of possible side streams.

[was_jaclaz]

I meant the cardboard-tinfoil one to protect the components near the chip.
I guess with that much 'wind' blowing down, the least one wants is the hot air finding its way under the protection.
On the other hand, in the videos you provided, people were just ripping a hole into the foil, without taking further care of possible side streams.

Yep, the "clever" part of my design was making the square see-through box with the cardboard, having an effect similar to this:

(without the spring loaded suction cup, of course)
Think of it as a box with no bottom nor cover held in place by a tinfoil wrapped around the "box" and board to which I later made a hole by punching in it my finger and modelling the sides along the edges of the "box".

Surely it did not guarantee a "perfect" fit, but surely enough avoided fluxes of air going under the tinfoil.


jaclaz

[MedEvil]

Yes, i understood your design and like it very much. The question was how or if you fasted the the cardboard to the pcb.




PS: Shouldn't we move this thread some place else, or at least give it another title, so that others might find it?

[MedEvil]

My best girl just came up with the ultimate Latin solution to the problem.
She asked, why we make it so complicated and don't simply use a flatiron!

[was_jaclaz]

My best girl

Hmmm, watch your words , it might seem that you also have another (slightly worse ) girl..... ... and suddenly the use of the iron by the former might become an unpleasant experience....

jaclaz

[MedEvil]

Only an italian would come up with the idea of having a sligtly worse girl as his second girl!

I would never 'replace' something good by something worst! Only ever by something better!
What again was the escalation of best?

Oh and i do have 3 girls!

[was_jaclaz]

Oh and i do have 3 girls!

As long as any two out of three don't know about the other ones it usually works...



jaclaz

[MedEvil]

Oh, i'm far better than you believe. I even had sometimes all 3 in bed at the same time!
Do i now become an honorary italian?

[was_jaclaz]

Oh, i'm far better than you believe. I even had sometimes all 3 in bed at the same time!
Do i now become an honorary italian?

Well , nice try , but NO.

The honorary citizenship committee needs at least two sets of three reports signed by your partners stating their satisfaction and rating your actual performances (plus their photo and telephone number - should it be needed for direct interviews), it is not so easy to get promoted and be allowed to the honour of Italianity, you will also need at least two Italian sponsors and pass a practical test, you know we have to keep the average VERY high in order to be able to sport this:





jaclaz

[MedEvil]

If it is that bürocratic to become an italian, i think i better become a frenchman!
Vive la revolution!

[was_jaclaz]

If it is that bürocratic to become an italian, i think i better become a frenchman!
Vive la revolution!

Yep, sure , but the admission test by our oltralpe friends includes eating escargots:
http://en.wikipedia.org/wiki/Escargot
(and publicly say that you really liked them)

Still less risky than the Japanese one, though :
http://en.wikipedia....wiki/Pufferfish
http://en.wikipedia....ki/Sashimi_fugu

With us you get some "Spaghetti alla Carbonara":
http://en.wikipedia.org/wiki/Carbonara
and a BIG glass of red Chianti wine on initiation....



jaclaz

[MedEvil]

Why didn't you say so in the first place? Now i'm absolutly sure i rather wanna become a frenchman than an italian.
"Spaghetti alla Carbonara" that's even worst than your bureaucracy!



PS: @ all frenchman: I really like eating snails!

[MedEvil]

Sems i have to try this blind.
The testing with applying pressure to the single chip, one at a time, didn't work. I couldn't even get the laptop to start once.
I guess the foam is just too soft and doesn't supply enough pressure at the chip edges.