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    #1

    acer aspire 8942

    This machine entered our store , without displaying image , we gave a short reflow on the GPU just to make sure was GPU problem , once we noticed was the issue , we informed the client about gpu substitution , and he agreeded . we've ordered the GPU and we instaled the new gpu , machine after 5 days came back only turning on the backlight , no ACER logo displaying on external or internal . what im missing?

    will chek bios and commong stuff , but weird issue . Let me know your taughts
    Tags: None
    #2
    Re: acer aspire 8942

    Use liquid flux, reflow it. May be the vga chipset is not sitting good.

    Comment

      #3
      Re: acer aspire 8942

      i've reflowed it , but nothing happen ,only activating brightness, so i went for the bios and after flashing it , start giving the logo acer , but notice some lines appearing and screen flickering somethimes .

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        #4
        Re: acer aspire 8942

        check screen cable

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          #5
          Re: acer aspire 8942

          alihomee , i even feel shame of my stupidity !!!!! what a noob work i've done for nothing .. desolder gpu reballing it and resoldering it .. and the problem persisted ..
          problem on the LVDS sockets.. cleaned well all contacts (before doing that i moved the cable but nothing happened .)after cleaning contact on the socket and on the terminal . TCHAMRAMMM .it works nice .
          DAM what a waste of time ! , thk mate

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            #6
            Re: acer aspire 8942

            Live and learn.

            Two stories for you. First one goes like this:

            We had this laptop in the shop, it was an Asus with a nvidia 7300 in it. It was my work laptop. It ran very very very cool (heavy bastard, too) but had a problem with the whites turning into a pink snow sometimes, most times, or all the time. It's been doing that since before i started work there.

            I put up with it for about 1 year i think. I was waiting for the GPU to fail completely, thinking it's a GPU problem. It never did, because the GPU wasn't the culprit. I thought the screen cable wasn't, either, because taking off the hinge covers and poking at the cable didn't always help.

            One day i finally decided to take the complete screen assembly apart and check the cable on both sides. After cleaning the end of the LVDS cable that went into the screen, the problem went away and never popped up again. And to think that i put up with it for so long. Then we sold the laptop to a neighbor of mine, and he hasn't complained.

            Second story, heard from a fellow tech:

            On a laptop, not all keys worked on the keyboard. First thing tried was a replacement keyboard - same keys did not work. Second, replaced KBC. Same thing. Third, replaced southbridge. Still same thing.

            Desperate, the guy called some other tech guy. After hearing his story, the other guy asked if he'd tried cleaning the keyboard connector with a brush and some alcohol. The first guy said he did not try that. He went ahead and cleaned the connector and of course the keyboard worked fully after that.

            As we become more advanced in the repairs we do, we tend to overlook simple things sometimes. It's happened to me a few times as well, so try keeping a checklist in your head.

            The first thing i do when starting on any kind of repair is blow the dust off and clean and reseat all connectors. And the last thing i do after completing any kind of repair is use a brush and IPA to clean all the flux off. Flux is an insulator and can do lots of weird things if it gets into connectors. Cleaning it off after any rework job prevents 99% of these problems from popping up.
            Originally posted by PeteS in CA
            Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
            A working TV? How boring!

            Comment

              #7
              Re: acer aspire 8942

              Th3_uniqu3, Sad but true , but this is the usual procedure i do .. but my main mistaque was , thinking there was a problem with the gpu since it was replaced ... once again we learn something .

              well machine came , back , its shuting down , and fan are always around 90% and temps are never hot , its around 38 degrees gpu , and 46 cpu .

              Since board was cooking 4 times in overall between desolrder solder desolder and solder . maybe HM55 is afected ? wich are your taughts .. kind weird situation and client is now fucked up with me .

              Comment

                #8
                Re: acer aspire 8942

                Hello,

                If I can remember correctly the gpu chipset is not on the motherboard, it has a separate card right? I had the same problem with you. Check on the opposite side of the chipset for a small 3 pins smd transistor is it has any solder break. On another one (same model) after changing the gpu, it had picture but randomly it was producing lines - artifacts on the screen. Guessed the problem was on graphics memory so I replaced the whole vga board..

                Hope I have helped you.

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                  #9
                  Re: acer aspire 8942

                  well this is a discrete on board gpu ,but i had flashed new bios on this .. alltough i returned now to the dumps i have saved , and until now it didnt disconnected . so let see ... weird that a bios could make system to shutdown .. any toughts on this issue ?

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                    #10
                    Re: acer aspire 8942

                    "we tend to overlook simple things sometimes" agree 100% with Th3_uN1Qu3; start ever with the BASIC.

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                      #11
                      Re: acer aspire 8942

                      yes my faut here was only because on a gpu intervention , because computer was really dead with no image to any place
                      , so when i replaced the gpu all was ok .. after it came with a differente symptmo , only brightness , and somethimes whern moving chassi it would display image with few error lines ... after cleaning the bloody lvds all was good ..
                      now about the shuting down issue , well after i returned to the previos bios , it seems stable ..

                      could a bios update make it to shutdown ramdomly ?=

                      Comment

                        #12
                        Re: acer aspire 8942

                        Yes.
                        Originally posted by PeteS in CA
                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                        A working TV? How boring!

                        Comment

                          #13
                          Re: acer aspire 8942

                          well all seems fine now ,
                          will let it test until tomorow . , but made 2 full windows install with drivers .. all good , now im with hdd of the client , let see . but guess is good now .. aleluia

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