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Topic:

dead laptop

Posted by: Georgina .      4 Jun 2009 @ 17:08
dead laptop

Hi, I have a problem I hope you may be able to help me with,

I received a replacement mainboard this morning and fitted it to my Medion MIM2230 laptop after attaching all the bits & pieces like processor, RAM, wireless NIC, BIOS battery etc. and it still fails to work.

The original fault was just a simple failing of the laptop, in that nothing at all happened either when the power supply and/or battery was inserted, or when the power button was pressed. Quite simply a totally dead condition. I suspected faulty motherboard and this diagnosis was confirmed when I took it to a specialist professional for a second opinion.

Since changing the mainboard there is absolutely no change to the laptop. It still shows no signs of life at all when power is introduced or when the power button is pressed, exactly as before. The power supply is tested and in perfect working order so it is delivering its payload to the daughter board, and I have tested the microswitch to prove it works. All cables and connectors from daughter to main boards appear to be in good condition and have been "buzzed" from end to end to prove continuity.

Can you give me any pointers as to what may be wrong please as I am still drawing the same conclusions as before I made this purchase, but am now thrown into doubt because I'm told that this board is "fully tested and working".

Reply by: Alan B. PCIQ IT ProfessionalIT Professional in Cambridge, CB22      4 Jun 2009 @ 17:47
RE: dead laptop

You have replaced the motherboard and it did not cure your problem. So either both your motherboards have a similar fault or the fault lies elsewhere!!!

If you are SURE that your power supply is working then the most common cause of this fault is a faulty power input jack. The power input jack is almost always located on the motherboard so this type of problem could usually be cured (at great expense) by replacing the motherboard or more cheaply by replacing or simply re-soldering the power input jack. In your case it seems that the power input jack is on a daughterboard so replacing the motherboard would NOT cure a problem with a faulty power input.

I do not believe a "specialist professional" could give you any better advice than this without removing the motherboard and testing it. I would say it seems likely you have replaced the wrong part, but I cannot possibly be sure.

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Reply by: Georgina .      4 Jun 2009 @ 20:20
RE: dead laptop

Hi, yes the power input jack is on a daughterboard not the mainboard and I have tested the voltage on the board side of the connector and found it is present. It is possible that the fault is on the daughterboard I suppose and not the motherboard, which is frustrating and was the reason I had a professional look at it before buying.

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Reply by: Alan B. PCIQ IT ProfessionalIT Professional in Cambridge, CB22      4 Jun 2009 @ 22:53
RE: dead laptop

Not much more I can add.

One of the big problems with laptop motherboards is testing them. You would need to rig something up that would enable you to operate the power switch and try to power up the board before testing the voltages. The voltage readings would not be meaningful unless the motherboard is trying to draw current.

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Reply by: Jon S. PCIQ IT ProfessionalIT Professional in Morecambe, LA3      5 Jun 2009 @ 02:32
RE: dead laptop

"fully tested and working"
i.e. its a second-hand motherboard pulled from a failed machine.
Now, why do you think the donor failed? Its very hard - if not impossible - to test a laptop m/b without building it into a new system. In which case it will be sold - as a working machine...
My opinion is that you've been sold a dud. Never EVER buy second hand motherboards, especially for laptops
Think of it another way. What is the most likely component to fail after the PSU and HD? Its not the memory or CPU...

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Reply by: Alan B. PCIQ IT ProfessionalIT Professional in Cambridge, CB22      5 Jun 2009 @ 08:07
RE: dead laptop

Jon S. wrote "It's very hard - if not impossible - to test a laptop m/b without building it into a new system. In which case it will be sold - as a working machine..." and he makes a valid, if somewhat cynical, point. However in the best case "fully tested and working" might mean "The display stopped working/was broken but the computer still seems to start okay so hopefully the motherboard still functions". Also, Jon's comment adds emphasis to my point that neither you nor the "specialist professional" can really be sure your problem is down to the motherboard.

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Reply by: Georgina .      5 Jun 2009 @ 18:27
RE: dead laptop

OK thanks for your comments they are very helpful even if they don't solve my problem. I think what I've learned is that this is a "dodgy" industry where so-called "professionals" are prepared to take our money with no guarantee of a solution and leave us punters dangling as prey for ebay entrepreneurs to also cash in on. I felt I was forced to buy a second-hand board because I was completely unable to find a purveyor of "brand new" items of this description. Actually I wasn't aware that "brand new" exists, as these items have such a short shelf-life that they are virtually out-of-date as soon as they leave the manufacturer's production line.

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Reply by: Jon S. PCIQ IT ProfessionalIT Professional in Morecambe, LA3      5 Jun 2009 @ 20:11
RE: dead laptop

"brand new" tends to be available for a couple of years for the large-scale companies who sell machines of their own design (e.g. Dell, HP/Compaq, Saumsung, Toshiba). Production runs and manufacturing sources are such that theres a degree of stability of spares availability
Lesser companies like Medion (and also Acer, Packard Bell, Gateway, E-machines, Advent and many others) simply resell rebadged machines from Taiwan or Chinese ODM compaanies, and you are right: production runs on these ARE short, and there is little production overrun for spares,
Its further complicated in that these tend to me the machines that are made to a tight price point - with all that implies for reliability.
Sometimes you can find new parts for these by identifying who actually made them (Medion just assemblet hem from a kit of parts). If examined closely some machines have cryptic marks,or alternative model numbers. Also the internet sometimes have them listed on crossreference sites. Sometimes you can work it out by Googling the markings on the motherboard.
What you have to also remember is that often these boards have generic faults: if one dies for a reason, then theres a good bet that others of the same model will have the same fault. With the likes of Dell these problems get ironed out quickly. With the smaller companies they tend not to be: instead they just move onto the next container of the next model and issues are never resolved.
In a case like this one, I would have put the probability of getting a bad replacement part as too high and would not have bothered. On the other hand, if it had been a Dell / Samsung / Sony / Toshiba I WOULD have fixed it

Contentious stuff I'm afraid and I'm sure others here will disagree with me, but thats my take based on what I've seen over the years

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Reply by: Dave C. PCIQ IT ProfessionalIT Professional in Nuneaton, CV11      6 Jun 2009 @ 00:22
RE: dead laptop

I tend to steer clear of laptop hardware repairs due to the difficulty of obtaining spares and also stripping down and re-assembling them. Having said that though I've managed to fix a fair few for friends and longstanding customers who may otherwise have junked them rather than seek out a specialist laptop repair service.

Sorry if I've overlooked anything here but it's a long detailed thread and I've read it only once.

I'm curious to know how your "specialist professional" concluded it was a motherboard fault?

Having tested that power was available at the various supply stages, did you with either motherboard try removing various of the components to see whether it sprang to life? With desktops and laptops I've known faulty disks, media drives, cpus, ram and graphics to prevent the motherboard from powering up. In my experience if either motherboard or cpu are faulty, its very difficult to determine which of the two it is unless you have a similar system to test with.

PS Not everyone in this 'dodgy' business is out to fleece innocent customers. I politely decline work I know I can't or am not prepared to handle and I never charge for problems I fail to fix - not that I've had many of those.



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Reply by: Robin N. PCIQ IT ProfessionalIT Professional in Watchet, TA23      6 Jun 2009 @ 01:44
RE: dead laptop

For my tuppence-worth, I've had my share of trouble tracking down replacement parts for short-lived laptops and can sympathise with your predicament Georgina. Professionals are not infallible, but I admit this is a weak defence if you have been robbed by someone who gave you duff information and charged for it. With a situation like yours I can see that there must be a bit of hit-and-miss in the diagnosis and in this case they got it wrong.

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Reply by: Alan B. PCIQ IT ProfessionalIT Professional in Cambridge, CB22      6 Jun 2009 @ 08:55
RE: dead laptop

I think this industry certainly has its dodgy aspects. Even where new laptop spares are available they are often prohibitively expensive and in addition they may be difficult for small repair companies to get hold of (Sony spares, for example, can be difficult to obtain). Thus it can be very difficult for a computer professional, who has to charge for his/her time, to offer a major repair to a laptop at a price that is attractive compared to the cost of a new machine.

On the other hand, the very existence of this forum, where computer professionals are prepared to offer free advice, seems to me to be a wonderful aspect of the Support side of the industry.

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Reply by: Georgina .      6 Jun 2009 @ 18:30
RE: dead laptop

I've spent hours trying to locate a spare daughter board for my laptop but it's hopeless! I don't really want to buy a used one after what you guys said and would rather buy new, but I can't find ANY out there on Google! Used would be better than none at all. Please guys; where can I look?

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Reply by: Robin N. PCIQ IT ProfessionalIT Professional in Watchet, TA23      6 Jun 2009 @ 18:35
RE: dead laptop

Good question. I don't have a magic answer for you I'm afraid as I'm not one of those who has an "insider" to contact within the industry. Have you tried Googling with the actual part number printed on the board? I ask because sometimes doing this throws up some surprising differences in the search results to just entering the make & model of your computer.

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Reply by: Jon S. PCIQ IT ProfessionalIT Professional in Morecambe, LA3      6 Jun 2009 @ 18:49
RE: dead laptop

1) can you clarify what you mean by "daughter board" on this one? Is this a carrier board for the power jack? most laptops have the power jack soldered directly to the motherboard, but a few have a separate board for the jack, linked by a ribbon cable
2) If I'm right on (1), does the power jack show any signs of being broken or loose/ Does the central pin wobble? It may be that you just need a new jack soldering on to the board - which is relatively cheap
3) Are there any model identification numbers on the motherboard and "daughter board" Any manufacturers names? Could just be a random string of letters or numbers. One should be a serial number, but there should be some kind of model identifier on both boards
If you can find those, please paste them here

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Reply by: Georgina .      6 Jun 2009 @ 19:30
RE: dead laptop

Hi Jon, I'll try to answer your questions. This power jack is very definitley on a separate board to the mainboard - hence "daughter board". There's no physical damage to the DC input jack whatsoever - no cracks, discoloration, stresses or looseness. The board also has 4 x USB (2 pairs of 2) ports mounted on it, the lid switch (which looks faulty) the power on/off button, a battery test button, the R/H speaker connector and what I guess is a TV/AV-Out socket, which sounds like quite a lot for a card no bigger than a packet of ten cigarettes! It isn't connected to the mainboard by a ribbon cable but by two many-stranded cables terminating in DIL style plastic connector blocks which push on. Markings on the board are numerous but I'll try.... (ASSY.411810400004-R) (TF041-TH-PCB:PWA-82581_8858/DAUGHTER_6L.BD) (HL 94V-0) (E251244) and on a paper bar code label (GP.8258 IC DD.GDA609157.0060. YX) Please ignore the brackets.

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Reply by: Jon S. PCIQ IT ProfessionalIT Professional in Morecambe, LA3      6 Jun 2009 @ 21:13
RE: dead laptop

plugging those numbers into Google brings up this thread which has some suggestions about where to get that board (its known as a power board,or power regulator board) fixed

http://www.howtomendit.com/answers.php?id=140844

I don't know any of the companies listed there, so am unable to comment about them

The consensus on the web is that most Medion laptops actually come from FIC, so could be worth checking if they can supply a board. My guess is its probably a standard component across many laptop models
Try mailing one of the FIC support centres on this page, giving them all the details you have just provided us


Finally its worth asking PCHub in Singapore whether they can find one - tehy have good contacts
http://www.pchub.com/uph/
http://www.fic.com.tw/service/branches.aspx

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Reply by: Jon S. PCIQ IT ProfessionalIT Professional in Morecambe, LA3      6 Jun 2009 @ 21:14
RE: dead laptop

just an aside - if the lid microswitch is jammed that would stop the machine powering up
Can you try freeing up the switch -- or even disconnecting it?

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Reply by: Georgina .      6 Jun 2009 @ 21:59
RE: dead laptop

Thanks I will try the leads you have given me. I've already mailed pchub to no avail. They did get back to me but just stated that they didn't have the part. The lid switch is not jammed but rather the opposite, in that the plunger is missing so there's no mechanism to activate it when the lid is shut.

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Reply by: Duane S.      8 Jun 2009 @ 13:09
RE: dead laptop

Hi Georgina.

the problem with those daughter boards is the internal traces cannot handle the current and burn out turning the Resin in to Carbon which then creates a short.

i have had good sucess in repairing these boards 12 out of 15, they are used in many laptops 17" and have a few different plug / socket / usb / s-vid configurations.

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Reply by: Duane S. PCIQ IT ProfessionalIT Professional in Leeds, LS12      8 Jun 2009 @ 13:11
RE: dead laptop

Hi Georgina.

the problem with those daughter boards is the internal traces cannot handle the current and burn out turning the Resin in to Carbon which then creates a short.

i have had good sucess in repairing these boards 12 out of 15, they are used in many laptops 17" and have a few different plug / socket / usb / s-vid configurations.

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Reply by: Andy H.      29 Sep 2009 @ 13:53
RE: dead laptop

Powerboards are available from this site.
A little pricey but should do the job.

http://www.ipc-computer.eu/it-pi-n-411807300007_Powerboard_8258D-pId-1883691.html

I have one of these laptops for repair but I dont think my friend wants to pay that much!

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Reply by: Richard B. PCIQ IT ProfessionalIT Professional in Edinburgh, EH1      29 Sep 2009 @ 17:07
RE: dead laptop

Andy H - why drag up a post that is over 3 months old?

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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Reply by: UAE T.      20 Mar 2021 @ 08:14
RE: dead laptop

I need advice on where can I get the best service of Dell laptop repair Dubai.

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