Question about laptop schematic

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • merkin
    Senior Member
    • May 2010
    • 57
    #1

    Question about laptop schematic

    Here's the schematic:
    http://lqv77.com/download/294/

    I want to know what the pink boxes represent.

    For example on page 28 of the schematic, there are pink boxes (or squares) and each one is numbered (NO.xx).

    Perhaps they are "optional componants"...since for this example the models(inspiron 1420) laptop's webcam is an optional, and on page 28 it seams componants regarding the webcam are the ones with pink boxes.

    Thoughts anyone?

    Thanks in advance.
    Tags: None
    • b700029
      Banned
      • Sep 2010
      • 640
      #2
      Re: Question about laptop schematic

      My guess is editor's notes. There are others without the No.xxx notation too.

        Comment

        • merkin
          Senior Member
          • May 2010
          • 57
          #3
          Re: Question about laptop schematic

          Hey man,
          Thanks for all your input.

          The reason I ask is because of the other thread you responded to...

          ...I was checking out ebay and found a listing for a used inspiron 1420 http://www.ebay.com/itm/280896426635...#ht_500wt_1027

          Except my inspiron 1420 does not have a webcam, but the ebay listing does have one. Figured it would be a plus if I can fix my current brightness issue and also get a webcam too.

          I ripped open my inspiron already and looked for the pcb footprints for webcam compatibility.

          I found the silkscreen print for inductor "L1" but the footprint must be underneath the metal sheilding right next to the label. And the shielding is soldered in place,

          Then I looked for R1 and R3, and also Q74 and Q75. And also U1 hex inverter.
          Found R1, R2, and R3, but in the schematic R3 is listed twice (just do a search in the schematic and you will see). Perhaps my motherboard is different revision than the schematic.

          Think I am gonna bid and take the chance anyway. If webcam dont work, oh well at least the lcd brightness should work again.

          Thanks again. I will post back if it works. Fingers are crossed.

          Please dont bid me up

            Comment

            • b700029
              Banned
              • Sep 2010
              • 640
              #4
              Re: Question about laptop schematic

              The webcam is a standard USB type webcam, just needs +5V/GND and the data pair. You could short across R1 and R3 to make a direct connection, but L1 is a common-mode choke probably installed to minimise interference on the data pair.

              The other thing it needs is +5V, and that's what that circuit with Q75/Q74 is doing, switching the power via a GPIO on the chipset (page 17), but R604 can be used to bypass it and always enable power to the webcam. Otherwise you can just tap into the +5V_RUN rail somewhere.

              U1 might be bypassed by R616 too, it looks like an option to invert mic's clock signal depending on the model installed.

              I can't find the second R3.

                Comment

                • merkin
                  Senior Member
                  • May 2010
                  • 57
                  #5
                  Re: Question about laptop schematic

                  Well you can see why I came to the assumption that the "pink boxes" are for optional components.
                  Originally posted by b700029
                  I can't find the second R3.
                  Its R1 not R3, sorry 'bout that.

                    Comment

                    • asliyucegsm
                      Badcaps Veteran
                      • Jun 2011
                      • 347
                      • Turkiye
                      #6
                      Re: Question about laptop schematic

                      thank you friend

                        Comment

                        • merkin
                          Senior Member
                          • May 2010
                          • 57
                          #7
                          Re: Question about laptop schematic

                          Replaced with exact OEM replacement.

                          Also the replacement came with integrated webcam and it also WORKS!

                          Thanks again.

                            Comment

                            • b700029
                              Banned
                              • Sep 2010
                              • 640
                              #8
                              Re: Question about laptop schematic

                              That means there's no changes required to the laptop itself to accommodate the webcam option. All the circuitry is already there on the mobo.

                              Just posting this as a note that might help someone in the future.

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • jimjoe123
                                  LCD TV Green/Pink screen problem
                                  by jimjoe123
                                  I have a Dick Smith 37" LCD TV, Model GE6804. I am using it as PC extended monitor only.

                                  Problem is while watching tv, I hear a semi loud click(like a electrical breaker tripping due to overload, just sound like it but no actual electrical overload), then screen is covered with green or pink. I can still see the original picture image but overlayed by green or pink. See attached images. Pink.jpg is what I see, and Normal.jpg is before green or pink screen, What I captured was pink screen, but about 80% of time it's green and 20% of time it's pink.

                                  Then each time...
                                  02-23-2020, 01:29 AM
                                • TinkerTron
                                  Schematic vs. Reality: Where Are the Resistors on My Sharp Clock Radio? Model FY-70CH
                                  by TinkerTron
                                  Hey everyone,

                                  I'm currently working on a mid-70s Sharp Electronic Digital Clock Radio, Model FY-70CH. I found the service manual online, printed it out, and have been studying it for a while. My main reasons for tackling this are: (1) I want to learn electronics and figured I'd start with something I had on hand, and (2) I want to fix its issues. Right now, the radio sounds awful, has about 5V DC at the speaker terminals, and the alarm time setting doesn't work. But I'm not asking how to fix these problems.

                                  Instead, here's what's been bugging me so far:
                                  The schematic...
                                  3 Photos
                                  03-06-2025, 02:03 PM
                                • atunguyd
                                  Acer x163w Monitor PSU schematic
                                  by atunguyd
                                  Ii wonder if anyone can help me. I have a Acer x163w monitor which is not powering up. The PSU main capacitor's one leg had completly come off - I replaced it but the PSU is still not outputting DC. I found the monitor in questions service manual here on manuals lib but the schematic in there is a completely different - the schematic shows no mosfet to drive the transformer while the one I have does use a mosfet - also the schematic shows only one optocoupler but mine has two.
                                  The PSU board is labelled FM-20A02-AAA made by APD as per the image below. I am trying to find a schematic for this...
                                  03-05-2025, 02:08 PM
                                • Thetechdude
                                  MSI Ventus RTX 4080 16G Broadview schematic needed
                                  by Thetechdude
                                  Hi guys, I'm working on a MSI Ventus RTX 4080 16G. The GPU has 12v, 5v, however what I assume is the 1.8v rail has 1.1v and what I assume to be PEX is 0v. As you may have guessed already there is no Vmem and no Vcore.

                                  I have looked around in related forum posts for a schematic so Much appreciated if anyone can share a Broadview schematic.

                                  Thanks.
                                  07-15-2025, 11:15 AM
                                • ianpoultonknights
                                  Zenbook Flip 15 UX562AI schematic
                                  by ianpoultonknights
                                  Had one of these come in for repair with a blown battery and a WiFi issue, battery has been replaced with genuine battery (twice) and won't take a charge works fine on AC, WiFi issue gone away. Looking for a schematic so I can trace the charger circuit UM562F is only one I can find, this is the 562AI model.Had a unit come in for repair — 562AI model — with a blown battery and WiFi issue. WiFi fault has cleared, but battery won’t charge despite replacing it twice with genuine parts. Device operates fine on AC power. Suspect charger circuit fault. Only schematic I’ve found so far is for...
                                  06-26-2025, 02:41 PM
                                • Loading...
                                • No more items.
                                Working...