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Liteon 74850c Mra Hack Problems


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#1 dave11674

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Posted 30 December 2010 - 09:21 PM

hi

i have a 74850c drive here
it has ix LT 1.1 on it
doing the drive half open trick would not do squat for this drive to get dummy from ix.

so i believe i have to do the MRA hack as this is what i had to do with a previous drive same model.

ok that other one went just fine.

this one is givign me all 777777777777777777 as the dvd key.
no way am i writing the data back like that heheh

ok so upon removing my 1.5 switch i clean solder points up and am noticing im getting a short across a couple of points, on a fresh board from the same drive this short is not presant.

can any1 help me here as the drive clearly aint dumping the key right so i cant proceed further.
the 2 arrows in the pic are the points that are shorting.
and as you can see there is clearly no solder bridging across the 2 tracks
IPB Image



thanks for any help and pointers here guys

#2 Takashi

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Posted 30 December 2010 - 09:50 PM

Well, you might want to ditch the lt switch, it's junk.
Use the Boxxdr method.

#3 dave11674

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Posted 30 December 2010 - 09:57 PM

basically same thing just diff hardware
same results


edit
same reults with the resistor Boxxdr method


still dont explain why teh 2 points are shorted out tho
when a fresh new drive they are not

dave

#4 iateshaggy

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Posted 31 December 2010 - 12:45 AM

take a picture of your drive. obviously there is a short and all you have to do is look at it to tell it is there, then remove that solder. if you have removed any obvious shorts and still have one, then you can toss the whole thing in the trash.

#5 dave11674

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Posted 31 December 2010 - 12:58 AM

QUOTE(iateshaggy @ Dec 30 2010, 11:45 PM) View Post

take a picture of your drive. obviously there is a short and all you have to do is look at it to tell it is there, then remove that solder. if you have removed any obvious shorts and still have one, then you can toss the whole thing in the trash.



erm do u not see the pic above !?!?!?

why throw it in the bin ?!?!?

its somethign simple i know this.

anyone else with something better to contribute ?

dave

#6 Takashi

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Posted 31 December 2010 - 02:22 AM

It's pretty hard to recover from shorts, majority of the time there's nothing you can do except
just learn better electronics skills for future mods.
One of the few ppl on this forum that even has a chance of helping you is syntaxerror329

Edited by Takashi, 31 December 2010 - 02:22 AM.


#7 dave11674

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Posted 31 December 2010 - 03:16 AM

QUOTE(Takashi @ Dec 31 2010, 01:22 AM) View Post

nothing you can do except
just learn better electronics skills for future mods.


hheheheh

ive been doing electronics engineering for the past 20 years mate
my soldering skills and electronic skills are 100 to 1 at teh best of times smile.gif

dave

#8 Takashi

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Posted 31 December 2010 - 03:29 AM

Don't take it the wrong way, but the pics don't reflect that lol

#9 totoz

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Posted 31 December 2010 - 11:16 AM

there's a big difference: see boxxdr jpeg and your pic...

With traces cut and power from ck3 (or 360) voltage at pin101 is 2,15v
and if u look the second (vertical) cut it's 2,15v on the left and 1,30v on the right

check these values

when u repair traces everything 3,3v

Clean the pcb with braid and use good flux, it helps a lot.

Edited by totoz, 31 December 2010 - 11:17 AM.


#10 dave11674

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Posted 31 December 2010 - 02:53 PM

the board is cleaned with braid and no need for flux.

there is no shorts across my solder points on this board.

takashi
lets see some of your pics then big shot

#11 Takashi

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Posted 01 January 2011 - 01:43 AM

QUOTE(dave11674 @ Dec 31 2010, 08:53 AM) View Post

takashi
lets see some of your pics then big shot


smile.gif probably my messiest work
74850C pic

#12 dave11674

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Posted 01 January 2011 - 05:58 PM

QUOTE(Takashi @ Jan 1 2011, 12:43 AM) View Post

smile.gif probably my messiest work
74850C pic

hahah u trying to say your work is better than mine and poist your messiest pic

lol

anyways back to topic.

totoz
the 2 vertical lines i do just to make it easier that trying to cut out the actual 101 point
i put a jump wire across the left and right contacts then so all is good.

dave

also looking at the dump there is lots of data in ther elike its fully dumping it.

dave

#13 iateshaggy

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Posted 01 January 2011 - 08:40 PM

he's not the one whose modded drive isn't working.

#14 Takashi

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Posted 01 January 2011 - 09:04 PM

it's all i had a pic of, I don't have a need to snap pics of my work, because i have a 100% success rate.

#15 Tron[ADS]

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Posted 01 January 2011 - 11:41 PM

QUOTE(dave11674 @ Dec 30 2010, 10:21 PM) View Post

i have a 74850c drive here
it has ix LT 1.1 on it
doing the drive half open trick would not do squat for this drive to get dummy from ix.


I'm a bit puzzled as to why you are wanting to do anything with this drive if it already has LT 1.1 on it.






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