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    #1

    Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

    Hello,

    I've got this motherboard here from a laptop that won't turn on and shows no signs of life at all. Before I spend $100 for a replacement motherboard, I'd like to take a crack at fixing this one. Maybe it's just a matter of a simple small IC replacement.

    I've measured the voltage at the connector so I know that's soldered on properly, but that's the extent of it.

    I'd like to know what I need to probe to check the voltages. I've looked at the schematic sheets (attached), and page numbers 40+ seem to be of particular relevance.

    I've also attached photos of both sides of the board near where the jack connector connects to the motherboard. The attached photos are better quality than the ones I included inline.

    Any help at all would be kindly appreciated.



    Attached Files
    "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

    -Leonid Brezhnev (On the Yom Kippur War)
    Tags: None
    #2
    Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

    Check voltage on pins of PQ9, PQ10

    Comment

      #3
      Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

      Thank you. I am getting 8 volts or so on gate and 20 volts or so on all source pins of both PQ9 and PQ10.
      "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

      -Leonid Brezhnev (On the Yom Kippur War)

      Comment

        #4
        Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

        Listen to this:

        I connected the bare minimum of the machine, just to see if it booted... Guess what? It's alive!

        Here's the caveat: With the LVDS cable plugged in, the machine won't turnon at all, no power, no nothing. But with the LVDS cable diconnected, and my LCD plugged in, the machine posts and works properly.

        Should I reflow the northbridge?
        "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

        -Leonid Brezhnev (On the Yom Kippur War)

        Comment

          #5
          Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

          Maybe the LVDS cable or the panel is bad.

          If it works OK on an external monitor then the chipset is probably OK.
          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
          -David VanHorn

          Comment

            #6
            Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

            A bad LVDS cable or bad panel can cause a machine to show no life signs at all (as in, not even the power light comes on)? Doesn't a problem with the northbridge make more sense?
            "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

            -Leonid Brezhnev (On the Yom Kippur War)

            Comment

              #7
              Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

              I'm just thinking if the northbridge is bad, why does it work with an external monitor?
              "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
              -David VanHorn

              Comment

                #8
                Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                My theory is that the pins responsible for LVDS output have seperated. Is LVDS output done on the HM55, or is there a seperate chip that does that?

                This is a 14" panel BTW, I wonder if these have 40 pins like the 15" LEDs.
                "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                -Leonid Brezhnev (On the Yom Kippur War)

                Comment

                  #9
                  Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                  If it was just disconnected or bad solder, wouldn't you just get no signal to the panel but the machine would still run? Or even run with corrupt display?

                  If it won't even power on with the panel connected, maybe something is shorted. Maybe the inverter or backlight is bad?
                  "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                  -David VanHorn

                  Comment

                    #10
                    Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                    Originally posted by mockingbird View Post
                    This is a 14" panel BTW, I wonder if these have 40 pins like the 15" LEDs.
                    You can check the spec of the panels to see their pinouts.


                    Originally posted by mockingbird View Post
                    A bad LVDS cable or bad panel can cause a machine to show no life signs at all (as in, not even the power light comes on)?
                    Maybe by connecting the panel you are shorting a rail. You can check the resistance on the LVDS connector (JLVDS1) with the panel connected.

                    Comment

                      #11
                      Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                      Thanks for the advice.

                      I took the screen apart and unplugged the other end from the LCD. With just the cable plugged in and attached to nothing, the computer will not turn on. As soon as I disconnect the LVDS cable from the motherboard, it boots right up.

                      Here's a pinout of the JLVDS1 connector from page 30 of the schematic PDF:



                      I can't probe the pins, they're much too small, and my probes are too big (I've really got to invest in a decent Fluke DM with a few decent pairs of leads. Right now all I've got is this $5 piece of junk).

                      Should I reflow at this point?
                      "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                      -Leonid Brezhnev (On the Yom Kippur War)

                      Comment

                        #12
                        Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                        Have you a) checked the slot for bent pins and b) tried another cable?

                        If the cable really is connected to nothing then I would suspect either the cable or the connector. If the cable is connected to nothing all that should be happening is the pins at the connector are being "extended", which makes it seem like the cable itself has a short.
                        Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

                        Comment

                          #13
                          Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                          Yes, I've examined the cable, it looks fine... The edge connectors have slot style pinouts so the pins can't really move...

                          I don't have probes small enough to check for continuity between one edge of the connector and the other...

                          Prices are high for these cables... You'd think they were made out of solid gold...
                          "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                          -Leonid Brezhnev (On the Yom Kippur War)

                          Comment

                            #14
                            Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                            My probes have alligator clip attachments - if the probes are too big I use the clips to hold something thin like a sewing needle and use that for a probe.
                            "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                            -David VanHorn

                            Comment

                              #15
                              Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                              Just an update gentlemen (Thanks Th3_uN1Qu3)...

                              Turns out the problem was both the cable and the screen. Ordered a new cable, plugged it in without anything attached to the other end and the computer booted right up. Attached the LCD to it and same problem as before.

                              Took a closer look at the (old) cable and noticed a corner was chipped off... Looked at the back of the LCD, and there is a burn mark near the connector and the broken part of the cable connector is burned inside the LCD connector.

                              I wonder how that happened.

                              Either way, with both the new cable and new LCD (matte this time, for the benefit of the customer), the laptop is working fine and has been returned to the customer. Paid around $25 for the cable (Pretty rare) and around $70 for the LCD. Thank you eBay Global Shipping Program for charging astronomical shipping rates outside the US.

                              I could have saved $20 on the LCD by buying a locally sourced generic Chinese LCD, but I would rather pay the premium for the original LG branded panel (In this case B140XW03. V.0 is glossy, V.1 is matte).
                              Last edited by mockingbird; 06-11-2014, 11:45 PM.
                              "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                              -Leonid Brezhnev (On the Yom Kippur War)

                              Comment

                                #16
                                Re: Compal LA-6151P eMachines/Gateway ID49C & Packard Bell NX86

                                Good to hear you got it working, nice!
                                "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                -David VanHorn

                                Comment

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