Vizio VP503 HDTV10a Black Screen

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK
    #41
    Re: Vizio VP503 HDTV10a Black Screen

    OK, on P7 -- check the attached pin outs for voltages. On P7 I expect a 5V or 15V standby voltage.
    Attached Files
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • MyHD120
        Senior Member
        • Jan 2013
        • 79
        • USA
        #42
        Re: Vizio VP503 HDTV10a Black Screen

        Thanks. Was getting ready for the big winter storm from NYC to Boston. Might be losing power today or tomorrow. Will get these numbers to you ASAP.

          Comment

          • MyHD120
            Senior Member
            • Jan 2013
            • 79
            • USA
            #43
            Re: Vizio VP503 HDTV10a Black Screen

            P7 pin outs on stand by. See photos
            Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK
                #44
                Re: Vizio VP503 HDTV10a Black Screen

                OK, PSU is being TOLD to turn on, so check P6 in the same image for 15V supply.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • MyHD120
                    Senior Member
                    • Jan 2013
                    • 79
                    • USA
                    #45
                    Re: Vizio VP503 HDTV10a Black Screen

                    See Photos.
                    Attached Files

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK
                        #46
                        Re: Vizio VP503 HDTV10a Black Screen

                        OK, so as expected the Panasonic PSU is working, the Vizio parts are probably failed. We need to look at that DC-DC converter board. Also, have you checked the voltage regulators on the main board? Very common issue with Vizio main boards.
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                          Comment

                          • MyHD120
                            Senior Member
                            • Jan 2013
                            • 79
                            • USA
                            #47
                            Re: Vizio VP503 HDTV10a Black Screen

                            Originally posted by tom66
                            . We need to look at that DC-DC converter board.
                            How would I do this?

                            Originally posted by tom66
                            Also, have you checked the voltage regulators on the main board? Very common issue with Vizio main boards.

                            So, I'll have to pull the Main and remove the voltage regulators to check them? I think I have something about checking them.

                            Going back a bit: I mentioned that after power on I get shut down after 30 seconds. LED goes back to orange.

                            Also, the LED's on the SC and SS boards fade out 20 seconds after power on.

                            Do these symptoms tell you anything?

                              Comment

                              • MyHD120
                                Senior Member
                                • Jan 2013
                                • 79
                                • USA
                                #48
                                Re: Vizio VP503 HDTV10a Black Screen

                                I'm now reading retiredcaps, "How to test a voltage regulator". Good stuff.

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK
                                    #49
                                    Re: Vizio VP503 HDTV10a Black Screen

                                    It tells me that Vsus is coming up but then shutting down after some time probably due to main board problem.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                      Comment

                                      • bjorkson
                                        Senior Member
                                        • Apr 2012
                                        • 127
                                        • USA
                                        #50
                                        Vizio VX32L black lines

                                        I have a 32in Vizio LCD VX32L with constant black lines on the screen. Do you guys think this is a bad inverter or t-con board? Or bad LCD panel?
                                        I have attached a pic...any help is appreciated. Thanks.
                                        Attached Files

                                          Comment

                                          • tom66
                                            EVs Rule
                                            • Apr 2011
                                            • 32560
                                            • UK
                                            #51
                                            Re: Vizio VX32L black lines

                                            Originally posted by bjorkson
                                            I have a 32in Vizio LCD VX32L with constant black lines on the screen. Do you guys think this is a bad inverter or t-con board? Or bad LCD panel?
                                            I have attached a pic...any help is appreciated. Thanks.
                                            You really need to put that in a separate thread. We will keep discussing the VP503 here. If you need help, PM a moderator. I am not a moderator.
                                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                              Comment

                                              • MyHD120
                                                Senior Member
                                                • Jan 2013
                                                • 79
                                                • USA
                                                #52
                                                Re: Vizio VP503 HDTV10a Black Screen

                                                Regulator Tests: I hope I get this right.

                                                (U15) 1084 center leg not connected

                                                Pin 1; 2.078v
                                                Pin 2; 3.321v
                                                Pin 3; 5.17v


                                                (U19) 1084 center leg not connected

                                                Pin 1; 12.52v
                                                Pin 2; 2.478v
                                                Pin 3; 5.18v

                                                (U20) 1084 center leg not connected

                                                Pin 1; .555v
                                                Pin 2; 1.803v
                                                Pin 3; 3.294v


                                                (U16) 7805CT (ON MC)

                                                Pin1; 12.01v
                                                Pin2; 0v
                                                Pin 3; 5.04v


                                                (U22) AMC 1117 (F0816G)

                                                Pin 1; 2.09v
                                                Pin 2; 3.339v
                                                Pin 3; 4.93v

                                                (U21) AMC 1117 (F0816G)

                                                Pin 1; 0v
                                                Pin 2; 1.25v
                                                Pin 3; 2.486v


                                                (U27) AMC 1117 (F0816G)

                                                Pin 1; 2.074v
                                                Pin 2; 3.325v
                                                Pin 3; 5.18v

                                                  Comment

                                                  • martyparish
                                                    Badcaps Veteran
                                                    • Dec 2012
                                                    • 313
                                                    • United States
                                                    #53
                                                    Re: Vizio VP503 HDTV10a Black Screen

                                                    I'n no expert but U16 looks suspect. You may want to double check that one just to be sure of the readings.

                                                      Comment

                                                      • MyHD120
                                                        Senior Member
                                                        • Jan 2013
                                                        • 79
                                                        • USA
                                                        #54
                                                        Re: Vizio VP503 HDTV10a Black Screen

                                                        Rechecked U16. All voltages are the same as above. Pin 2 sometimes shows a .2Mv.

                                                        U27 above should be labeled U17
                                                        Last edited by MyHD120; 02-09-2013, 09:51 AM.

                                                          Comment

                                                          • retiredcaps
                                                            Badcaps Legend
                                                            • Apr 2010
                                                            • 9271
                                                            #55
                                                            Re: Vizio VP503 HDTV10a Black Screen

                                                            U16 is correct. It is your classic 7805 5V regulator.

                                                            On U19 for pin 1, do you mean 1.252 and not 12.52V?
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                                                              Comment

                                                              • MyHD120
                                                                Senior Member
                                                                • Jan 2013
                                                                • 79
                                                                • USA
                                                                #56
                                                                Re: Vizio VP503 HDTV10a Black Screen

                                                                Originally posted by retiredcaps
                                                                U16 is correct. It is your classic 7805 5V regulator.

                                                                On U19 for pin 1, do you mean 1.252 and not 12.52V?
                                                                My bad. 1.252. If you see any bad regulators can you point me directly to where I can buy the part and the exact part number? I cannot understand those datasheets.

                                                                  Comment

                                                                  • MyHD120
                                                                    Senior Member
                                                                    • Jan 2013
                                                                    • 79
                                                                    • USA
                                                                    #57
                                                                    Re: Vizio VP503 HDTV10a Black Screen

                                                                    Bump

                                                                      Comment

                                                                      • tom66
                                                                        EVs Rule
                                                                        • Apr 2011
                                                                        • 32560
                                                                        • UK
                                                                        #58
                                                                        Re: Vizio VP503 HDTV10a Black Screen

                                                                        The regulators look OK. When you press the power button does anything on P6 change?
                                                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                                          Comment

                                                                          • MyHD120
                                                                            Senior Member
                                                                            • Jan 2013
                                                                            • 79
                                                                            • USA
                                                                            #59
                                                                            Re: Vizio VP503 HDTV10a Black Screen

                                                                            During standby, all are in the mv stage. Power on changes pin 7 & 8 (?) to 15.26v. See photo from post 45 above.
                                                                            Last edited by MyHD120; 02-10-2013, 05:36 AM.

                                                                              Comment

                                                                              • tom66
                                                                                EVs Rule
                                                                                • Apr 2011
                                                                                • 32560
                                                                                • UK
                                                                                #60
                                                                                Re: Vizio VP503 HDTV10a Black Screen

                                                                                OK, so since the PSU is working fine, the problem is on the main board -- a very common defect with Vizio TVs. If the regulators are fine it could be a firmware issue, but you may need to simply swap the board out.
                                                                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                                                  Comment

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