Missing 5V and can't read VCC of RT8206B

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  • orientalsniper
    Badcaps Veteran
    • Apr 2013
    • 459
    • USA

    #1

    Missing 5V and can't read VCC of RT8206B

    Hello, I can't read anything in pin 3 (VCC) of RT8206B, I can read 3.3V but not 5V. What does this usually indicate? Is problem with RT8206B or is it something else?
  • orientalsniper
    Badcaps Veteran
    • Apr 2013
    • 459
    • USA

    #2
    Re: Missing 5V and can't read VCC of RT8206B

    I swapped with another RT8206B, I'm getting 5V in some pins, however pin 3 is 5V and pin 6 is 19V. BIOS and EC chip have no V readings.

    Comment

    • spidey
      climbs
      • Dec 2012
      • 644
      • Cyprus

      #3
      Re: Missing 5V and can't read VCC of RT8206B

      what is the motherboard code ? need to check from the schematic. usually if there is 3.3v and 5v is missing it is EC problem. check which signal enables 5v output.

      Comment

      • orientalsniper
        Badcaps Veteran
        • Apr 2013
        • 459
        • USA

        #4
        Re: Missing 5V and can't read VCC of RT8206B

        It's a Dell N4110 (DA0V02MB6E1). After I flashed EC, laptop was able to turn on, but wouldn't post, so I went to flash BIOS, however, the traces came up and I had to do trace repair, then PQ19 was smoking, so I replaced it.

        Now I'm measuring RT8206B and it has 3.3V and 5V, now BIOS lost 3V. I was so close to repairing this, any ideas?

        Comment

        • orientalsniper
          Badcaps Veteran
          • Apr 2013
          • 459
          • USA

          #5
          Re: Missing 5V and can't read VCC of RT8206B

          Is it weird I'm getting 3.3V in pin 3,7,8 of the EC chip and 3.3V in all pins of BIOS chip but pin 4?

          Comment

          • highpulse
            i hate HP
            • May 2013
            • 1488
            • portugal

            #6
            Re: Missing 5V and can't read VCC of RT8206B

            Since you have a lot of problem with 3.3 and 5 volts line , and now you mention you have lost voltage for the spi bios , have you checked the correct signal incoming from KB controller ? also if you can share here the schematic will be more easy to tell you some stuff to chek .
            which are the values for LDO on the main Step controller ? also for the EN1 and EN2 pins , you should get around 5 volts ..

            another things im curious its practically impossible having 3.3 volts on all pins of any of the bios SPI or EC . so double cheek with schematic if you are reading the correct chip.
            Let us know and share here the schematic for we can help you out solving this

            Comment

            • orientalsniper
              Badcaps Veteran
              • Apr 2013
              • 459
              • USA

              #7
              Re: Missing 5V and can't read VCC of RT8206B

              Hello, I don't have schematic of this board.

              EC chip has 3.3V in pins: 3, 7, 8 and BIOS chip in pins: 1,2,3,5,6,7,8.

              In RT8206B: LDO is pin7(5V), EN1 is pin14(3.3V) and EN2 is pin27(5V).
              Last edited by orientalsniper; 03-06-2014, 03:43 PM.

              Comment

              • orientalsniper
                Badcaps Veteran
                • Apr 2013
                • 459
                • USA

                #8
                Re: Missing 5V and can't read VCC of RT8206B

                I think this is the schematic:

                http://kythuatphancung.com/download/...chematics.html

                Comment

                • highpulse
                  i hate HP
                  • May 2013
                  • 1488
                  • portugal

                  #9
                  Re: Missing 5V and can't read VCC of RT8206B

                  ok opening the schematic now , i will re edit this post with a possible solution , let me chek

                  Tell me which is the identification for each bios chip ? Uxx??

                  chek voltages on U1 and U12 , its impossible you having on pin 4 of U12 voltage at all ..chek also if the U12 is the MX25L3205D...

                  Also the 3.3 volts on this PCH bios chip are 3.3 Run meaning that this voltage can only be present when you turn on machine and pass S5 state

                  Also you mention pq19 was burned, this is a controller to make 1.5v-sus to 1.5V_run
                  Last edited by highpulse; 03-06-2014, 04:35 PM.

                  Comment

                  • orientalsniper
                    Badcaps Veteran
                    • Apr 2013
                    • 459
                    • USA

                    #10
                    Re: Missing 5V and can't read VCC of RT8206B

                    Hello, U12 is a W25Q32, U1 is a W25X80 (originally a W25X40).

                    The voltages are EC (U1) chip has 3.3V in pins: 3, 7, 8 and BIOS (U12) chip in pins: 1,2,3,5,6,7,8.

                    Sometimes when I replug DC adapter, BIOS loses all voltages. (0V)

                    Comment

                    • highpulse
                      i hate HP
                      • May 2013
                      • 1488
                      • portugal

                      #11
                      Re: Missing 5V and can't read VCC of RT8206B

                      For EC rom pins with 3.3V_alw pin 3 7 and 8 .. for PCH rom , you will have only voltages when you turn on the machine .

                      Do you notice PCH to get hot in any way ? or any place on board with hot temp ?

                      checking the schematic there is really nonsense , in having voltages on all pins of PCH bios ..alltough the PCH bios its different than the one mentioned on the schematic but even like this its impossible having voltage on pin 4 . so PCH might be dead . (attention PCH bios you can't reflash it with rom found on the brand site . you must find a good DUMP ROM site were you can get this rom you need to ref lash pch bios , but in any case , if you have 3.3 volts on the SPI part of the PCH bios , then its like PCH is sending you does values .REplace PCH and let us know

                      Comment

                      • orientalsniper
                        Badcaps Veteran
                        • Apr 2013
                        • 459
                        • USA

                        #12
                        Re: Missing 5V and can't read VCC of RT8206B

                        I notice no heat in the motherboard

                        Also, I downloaded BIOS from Dell website, it was a 5MB rom, so I dumped my EC and BIOS and used HxD to find starting offset and flashed with eeprom programmer. I don't think Dell BIOS'es are encrypted unlike HP, because I found relevant patterns.

                        Comment

                        • orientalsniper
                          Badcaps Veteran
                          • Apr 2013
                          • 459
                          • USA

                          #13
                          Re: Missing 5V and can't read VCC of RT8206B

                          The only weird thing is the laptop turned on when I flashed the EC chip just not POSTing, shit hit the fan when the traces of BIOS pin 2, 5, 6 were damaged, so I retraced it after BIOS reprogramming.
                          Last edited by orientalsniper; 03-06-2014, 05:11 PM.

                          Comment

                          • highpulse
                            i hate HP
                            • May 2013
                            • 1488
                            • portugal

                            #14
                            Re: Missing 5V and can't read VCC of RT8206B

                            nooooooooo , SPI KBC ROM flash info , its entirely not the same as PCH bios . so if you flashed it with what you have found on website brand , than you must find the correct rom on a good bios dump SITE.
                            the bios we usually find on website brand like hp , dell toshiba etc , are for KBC ONLY . never for PCH or VIDEO CARD.

                            Comment

                            • orientalsniper
                              Badcaps Veteran
                              • Apr 2013
                              • 459
                              • USA

                              #15
                              Re: Missing 5V and can't read VCC of RT8206B

                              mmmmmm, does that explain the 3.3V in PCH BIOS?

                              Comment

                              • highpulse
                                i hate HP
                                • May 2013
                                • 1488
                                • portugal

                                #16
                                Re: Missing 5V and can't read VCC of RT8206B

                                hum , well im not entirely sure , but since machine architecture work on hexadecimal and binary , it could be a possibility , worth a try ! let us know the result

                                Comment

                                • orientalsniper
                                  Badcaps Veteran
                                  • Apr 2013
                                  • 459
                                  • USA

                                  #17
                                  Re: Missing 5V and can't read VCC of RT8206B

                                  I can't find it. Bumping in case someone does.

                                  Comment

                                  • bishnu
                                    New Member
                                    • Jan 2012
                                    • 5

                                    #18
                                    Re: Missing 5V and can't read VCC of RT8206B

                                    please check ITE (IO) pin 127 to rt8206b pin n 25 conection I THINK SOLVE YOUR PROBLEM

                                    Comment

                                    • raihan
                                      Member
                                      • Feb 2016
                                      • 41
                                      • Bangladesh

                                      #19
                                      Re: Missing 5V and can't read VCC of RT8206B

                                      n4110 bios
                                      Attached Files

                                      Comment

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