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Boardview for Compal LA-8133P

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    #1

    Boardview for Compal LA-8133P

    Hi, everyone! I need the boardview for the Compal LA-8133P board or advice on how to fix 2 beeps & no image (but backlight on).

    The device is a Thinkpad Edge E530.
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    #2
    Re: Boardview for Compal LA-8133P

    As far as i know, BoardView is not publicly available for this model. But looking at the photos, all major components, small transistors and resistor networks have markings so the tracing of components shouldn't be that much difficult.

    2 Beep is generally RAM related errors. Check all RAM requirements like VCC, VTT, VREF etc and SM BUS communication between RAM and PCH via Oscilloscope. If you don't have DSO, at least verify the bus carrier voltage is proper using DMM.
    Last edited by anshad; 03-18-2019, 09:49 PM.

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      #3
      Re: Boardview for Compal LA-8133P

      I'll check those voltages with a multimeter, but isn't it possible there is a VRAM memory issue that triggers this beep code?

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        #4
        Re: Boardview for Compal LA-8133P

        The voltages seem to be around 0.65 to 0.75 V, instead of 1.5V. My memory isn't LPDDR3, but just DDR3 SODIMM. What can cause these low voltages?

        EDIT: May I have cause the multimeter to read these voltages at half their value by grounding the negative and measuring only with the positive wire?
        Last edited by antoniu200; 03-19-2019, 11:35 AM.

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          #5
          Re: Boardview for Compal LA-8133P

          Originally posted by antoniu200 View Post
          The voltages seem to be around 0.65 to 0.75 V, instead of 1.5V. My memory isn't LPDDR3, but just DDR3 SODIMM. What can cause these low voltages?

          EDIT: May I have cause the multimeter to read these voltages at half their value by grounding the negative and measuring only with the positive wire?

          Sorry, i didn't understand what you have meant. Black prob at common ground and red at a voltage rail should give you proper voltage reading. Make sure to place probe at the output side of coil - preferably at the positive pin of output filter cap.

          Vref and VTT are typically half of RAM supply. That is 0.75 for DDR3 and 0.675 volt for DDR3L. SMBUS data and clock carrier voltages are 3.3 volt for both DDR3 and DDR3L. The SPDVDD voltages should also be 3.3 volt.


          I am not an expert in component level repair but my limited experience says a VRAM failure is less likely to cause 2 beep error. I would expect GPU related error code or artifacts in display if VRAM failed.
          Last edited by anshad; 03-19-2019, 10:58 PM.

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            #6
            Re: Boardview for Compal LA-8133P

            That is what I meant. But, after I measure these voltages again, what's next? I mean, if I end up with bad voltage at any pin, how do I get to fix that? I don't know where the voltage comes from as I don't have the Boardview file. My RAM sticks are fine, they come from another laptop and there they work and they used to work in this one too, only now they don't.

            I will come back with a post after I measure all 200 pins. Until then, someone might enlighten me on my next step for fixing this machine.

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              #7
              Re: Boardview for Compal LA-8133P

              Neither you don't need the BoardView to measure those basic voltages nor you don't need to check all 200 Pins. The main voltage RAM VCC you can simply check on the PWM coil output which can be identified from the schematic. LA-8133P Schematic says it is PL501 which is the PWM output coil for 1.5 volt. Your board has clear markings on all major components so it is very easy to identify the PL501 on board. Other voltages like VTT, Vref, SPDVDD all has specific fixed pins on the RAM slot. You can find the pin numbers also by referring to the schematics.
              Last edited by anshad; 03-20-2019, 03:33 AM.

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                #8
                Re: Boardview for Compal LA-8133P

                Well, for me, it isn't easy, as I have close to zero experience with fixing boards, especially without Boardview. I get that it is easier than most boards to identify chips and components, but for me, jibberish letters and numbers don't represent anything without an easy to see location on the board. Using Boardview software, I can just search for the part ID in the file and let the computer find the part location for me. Now, I have to search all over the motherboard for some small writing, which takes time.

                And thanks for clarifying out the VCC location for me! Though I had already known that the other pin locations appear on the schematic, it was obvious. But still, I'm not going to be couting the pins to see which one I have to measure, I'll just go over them all, it's going to be faster than counting, as with those small dimensions, I'll easily count pins twice and other pins I might completely skip, resulting in wrong count.
                Last edited by antoniu200; 03-20-2019, 03:49 AM. Reason: Clarification

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                  #9
                  Re: Boardview for Compal LA-8133P

                  I am also not a professional tech. I do basic stuff etc but going pro require lot of work experience and costly tools - especially a descent DSO and a Microscope like Amscope, SPI BIOS programmer which supports 3.3v/1.8v EEPROM chips, Super IO programmer, optionally a BGA rework station too.

                  In your case, at least schematic available. Even as we speak now, i have two laptops to fix which doesn't even have schematic available. As you may guess, it is a challenge to fix them unless the fault is something simple like shorted caps etc. Schematic and BoardView are mainly an Apple thing. If you look at sites which sells schematics, you will find that schematic as well as boardview for 99% of Apple products are available.
                  Last edited by anshad; 03-20-2019, 05:24 AM.

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                    #10
                    Re: Boardview for Compal LA-8133P

                    The voltage on LP501 is there: reads 1.53V.
                    VDDSPD reads 3.33V
                    VTT1 reads 0.73V
                    VTT2 is supposed to be on the other side of the RAM module?
                    VREF_DQ reads 0.73 too
                    VREF_CA reads 1.53V.

                    This is wierd, I think all of these are the way they're supposed to be.

                    EDIT: I might have a problem locating VCC... There doesn't seem to be a "fixed pin" on the memory module for that. I can find it related to the CPU... Maybe try a different CPU?
                    Last edited by antoniu200; 03-20-2019, 08:13 AM. Reason: Completion

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                      #11
                      Re: Boardview for Compal LA-8133P

                      Yah, they are normal values. What about SDA and SDL ?

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                        #12
                        Re: Boardview for Compal LA-8133P

                        It oscilates like crazy from 1.3V to 3.3V then drops to 0V and I get no more voltage on any pin. I restarted the laptop after this then I let it run for 30 seconds and the same phenomena happened. I removed the CMOS battery and got 3 beeps and 3.3V on SDA, restarted the laptop again and the 2 beep code is back, alongside the wierd drop to 0V. SDL is not present on the schematic...
                        Last edited by antoniu200; 03-20-2019, 08:32 AM.

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                          #13
                          Re: Boardview for Compal LA-8133P

                          Well, I sent it to a professional, and it turns out my display cable got shorted. Why? I have no clue, but it did. I'll order a new one and report back (it'll probably take some time to arrive as, in my country, these DC02001FR10 cables are listed for $20 and I'm not paying that much for a cable (no free shipping included). I'll get one on eBay.

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                            #14
                            Re: Boardview for Compal LA-8133P

                            Hope that the new cable will fix your problem. May be the beep code is about display related and my assumption about a possible RAM related fault could be wrong. Thanks for the feedback.

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                              #15
                              Re: Boardview for Compal LA-8133P

                              Thing is, it's what I also thought at first: a RAM issue. But the voltages say no to that. Also, a missing part of a pin on the display cable (incredibly small part, very hard to notice, but under a magnifying glass it is noticeable) says the guy was right: it must have been a short somewhere in that cable.

                              Also, when removing the CMOS battery, it seems like the laptop makes 3 beeps instead of 2, which actually indicates a Display Assembly Issue.

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