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    #41
    Re: Sharp Aquos LC-32D40U - no image

    I read throught the datasheet and saw the 2.20 VDC +/- 1%, but thought it was dependent upon VCC which in the example was 3.3 VDC. On this board, VCC is 5.3 VDC. Make a difference?

    Checking my DVM against a reference voltage source now.

    Looked over the various voltage regulators on the PS:

    IC506 = 5.01 VDC
    IC508 = 5.33 VDC
    IC505 = 5.19 VDC
    IC510 = 8.90 VDC

    Comment

      #42
      Re: Sharp Aquos LC-32D40U - no image

      Were it you, would you be confident that the t-con is the defective board?

      Comment

        #43
        Re: Sharp Aquos LC-32D40U - no image

        Originally posted by ahickman View Post
        I read throught the datasheet and saw the 2.20 VDC +/- 1%, but thought it was dependent upon VCC which in the example was 3.3 VDC. On this board, VCC is 5.3 VDC. Make a difference?
        My interpretation is that it is a fixed 2.20V regardless of Vcc. Vcc can be 2.5 to 20V (page 4).

        Looked over the various voltage regulators on the PS:

        IC506 = 5.01 VDC
        IC508 = 5.33 VDC
        IC505 = 5.19 VDC
        IC510 = 8.90 VDC
        I'm talking about voltage regulators on the main board (where the AV, HDMI, RCA).
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          #44
          Re: Sharp Aquos LC-32D40U - no image

          Originally posted by ahickman View Post
          Were it you, would you be confident that the t-con is the defective board?
          Not until I check out the voltage regulators on the main board. See above post.
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            #45
            Re: Sharp Aquos LC-32D40U - no image

            Originally posted by ahickman View Post
            Checking my DVM against a reference voltage source now.
            What make and model do you have? Some manufacturer products age better than others.
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              #46
              Re: Sharp Aquos LC-32D40U - no image

              Checking main board VR's now. DVM I am using checked out OK. Vref = 3.30V and reads as 3.31 VDC.

              IC3804 (3.3 v REG ON AV BOARD) = 3.36 VDC
              IC3201 (3.3 V REG on scaler board) = 3.30 VDC
              IC3202 (1.5 V REG on scaler board) = 1.60 VDC
              IC3602 (3.3 V REG on scaler board) = 0.0 VDC
              IC3601 (1.8 V REG on scaler board) = 0.0 VDC

              Comment

                #47
                Re: Sharp Aquos LC-32D40U - no image

                Originally posted by ahickman View Post
                IC3602 (3.3 V REG on scaler board) = 0.0 VDC
                IC3601 (1.8 V REG on scaler board) = 0.0 VDC
                What is the reading for all pins on the two above?
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                  #48
                  Re: Sharp Aquos LC-32D40U - no image

                  Originally posted by ahickman View Post
                  IC3602 (3.3 V REG on scaler board) = 0.0 VDC
                  IC3601 (1.8 V REG on scaler board) = 0.0 VDC
                  What are you calling the scalar board? Post a picture of it with the two ICs above circled in red.
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                    #49
                    Re: Sharp Aquos LC-32D40U - no image

                    Pins #2 on both read 5.0 VDC. Remaining pins have 0.0 VDC. Attached are a front/back shot of scaler board.
                    Attached Files

                    Comment

                      #50
                      Re: Sharp Aquos LC-32D40U - no image

                      Originally posted by ahickman View Post
                      Pins #2 on both read 5.0 VDC. Remaining pins have 0.0 VDC.
                      What is part number of both?
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                        #51
                        Re: Sharp Aquos LC-32D40U - no image

                        Ic3602 = ba00bc0wfp
                        ic2601 = bd7820fp

                        Comment

                          #52
                          Re: Sharp Aquos LC-32D40U - no image

                          It looks like both belong to a subsection called MICON2. I'm not sure what that stands for, but it is possible that until the TV actually turns on, those output voltages are at 0.0V. It will all depend on what the datasheet says those components are and the expected output voltage.

                          Are those 2 connectors (CP3601 and CP3603) on MICON2 usb ports?
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                            #53
                            Re: Sharp Aquos LC-32D40U - no image

                            They both look to be part of the HDMI interface. Both have pins #1 (Vc) connected to a H_INT line. Might be that they don't turn on until this pin goes high?

                            Comment

                              #54
                              Re: Sharp Aquos LC-32D40U - no image

                              Originally posted by ahickman View Post
                              Ic3602 = ba00bc0wfp
                              ic2601 = bd7820fp
                              1)


                              page 2 says for a VCC of 5V, Vo = 3.0V, 3.3V

                              2)


                              page 1 says output voltage is 1.0V minimum and 5.0V maximum.

                              3) So if both ICs are supposed to output non zero voltages as per datasheet, then the MICON2 subsection is bad.

                              4) For both ICs, see if the VCC pin is shorted to ground pin. Any reading under 30 ohms suggests short.

                              5) If they aren't turned on until a HDMI cable is connected, then it may be working as intended.
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                                #55
                                Re: Sharp Aquos LC-32D40U - no image

                                If MICON2 works as speculated, then that only leaves the t-con. If you can find a replacement t-con for $20 on ebay, it might be worth shotgunning this one?

                                I would wait for momaka to see what he thinks of the 5% out of tolerance on U300 first.
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                                  #56
                                  Re: Sharp Aquos LC-32D40U - no image

                                  Originally posted by ahickman View Post
                                  Q302 - 8 pin chip, numbers as they appear:

                                  4422
                                  8E5519
                                  See if the mosfet is shorted between Vdd and GND.



                                  Measure the DC voltage of Vdd, input, and output with respect to GND.
                                  Last edited by retiredcaps; 07-06-2012, 10:39 PM.
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                                    #57
                                    Re: Sharp Aquos LC-32D40U - no image

                                    Neither are shorted to ground.

                                    Comment

                                      #58
                                      Re: Sharp Aquos LC-32D40U - no image

                                      Originally posted by retiredcaps View Post
                                      See if the mosfet is shorted between Vdd and GND.



                                      Measure the DC voltage of Vdd, input, and output with respect to GND.
                                      Pins 1, 2 and 3 are shorted to ground, but pins 4 and 5 are not. According to the datasheet you linked to, 4 and 5 should be GND?

                                      Comment

                                        #59
                                        Re: Sharp Aquos LC-32D40U - no image

                                        Originally posted by ahickman View Post
                                        Pins 1, 2 and 3 are shorted to ground, but pins 4 and 5 are not. According to the datasheet you linked to, 4 and 5 should be GND?
                                        Do you have correct orientation for the pin? The notch tells you where pin 1 is.
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                                          #60
                                          Re: Sharp Aquos LC-32D40U - no image

                                          Correct orientation.

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