LCD 2DIN CAR radio screen problem

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  • domix
    Senior Member
    • Jan 2014
    • 163
    • Slovenia

    #1

    LCD 2DIN CAR radio screen problem

    I have this china no name car radio, touch screen 7''.

    I have no picture on it, only buttons have light, screen are black. I open it and i meassured caps so 2 of them have strange values, migth this is the problem?

    100uF-97uF
    47uF-43,7uF
    22uF-20,9uF
    22uF-21,7uF
    100uF-118,3uF
    22uF-118,5uF
    22uF-22,3uF
    1uF-1,1uF
    4,7uF-20,1uF
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: LCD 2DIN CAR radio screen problem

    Did you remove the caps and test them off the board? It sounds like you do not have backlights for the screen. Need good clear pictures of the screen assembly so we can see the wires of the LCD panel. From you pictures I cannot tell if it uses high voltage for the CCFL backlights or LED backlights type.
    Last edited by budm; 04-29-2014, 12:03 PM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30985
      • Albion

      #3
      Re: LCD 2DIN CAR radio screen problem

      it's led - i had one.
      and it's a nightmare to strip because they put glue over all the ribbon-connectors!

      Comment

      • lti
        Badcaps Legend
        • May 2011
        • 2547
        • United States

        #4
        Re: LCD 2DIN CAR radio screen problem

        The capacitance measurements are fine. C4 and C14 are in parallel, so you should see around 122uF. Also, C16, C17, C20, and C24 appear to be in parallel. You're measuring the combined capacitance of all those caps.

        Comment

        • domix
          Senior Member
          • Jan 2014
          • 163
          • Slovenia

          #5
          Re: LCD 2DIN CAR radio screen problem

          So, how to fix it? Is it lcd inverter? can i connect this lcd from car to inverter on pc lcd or laptop lcd inverter, to se if i have backlight? or it will burn lcd?

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 30985
            • Albion

            #6
            Re: LCD 2DIN CAR radio screen problem

            it will destroy the dislpay panel if you connect it to an invertor.

            Comment

            • domix
              Senior Member
              • Jan 2014
              • 163
              • Slovenia

              #7
              Re: LCD 2DIN CAR radio screen problem

              Then it is best to throw it away, and buy new one ? i can connet it to the external display, but only when i turn radio on screen blinks and than is black image on ext, diplay.

              Comment

              • stj
                Great Sage 齊天大聖
                • Dec 2009
                • 30985
                • Albion

                #8
                Re: LCD 2DIN CAR radio screen problem

                does the touchscreen work?
                i mean - is it *just* a backlight problem?

                Comment

                • domix
                  Senior Member
                  • Jan 2014
                  • 163
                  • Slovenia

                  #9
                  Re: LCD 2DIN CAR radio screen problem

                  i dont' know for touch, it it not my radio so i dont know where to press it to something work :P

                  Comment

                  • stj
                    Great Sage 齊天大聖
                    • Dec 2009
                    • 30985
                    • Albion

                    #10
                    Re: LCD 2DIN CAR radio screen problem

                    o.k. press the eject button to make the front open and put a music cd in it.
                    if it takes it in and plays it we can assume it's working.

                    Comment

                    • tibimakai
                      Badcaps Legend
                      • Jan 2012
                      • 3680
                      • USA

                      #11
                      Re: LCD 2DIN CAR radio screen problem

                      I don't know how is this receiver, but since the display is moving, it may be a broken ribbon cable also.
                      This is why, I don't like the 7" screen receivers or the flip out ones.
                      Did you try using a flashlight on the screen, while playing a DVD, to see if there is an image on the screen?

                      Comment

                      • domix
                        Senior Member
                        • Jan 2014
                        • 163
                        • Slovenia

                        #12
                        Re: LCD 2DIN CAR radio screen problem

                        with flashlight i don't see nothing on the screen, even if i put the cd in, nothing happens, only cd start to spin and that all, if i press any buttons on the screen or on remothe is only beep sound, if i pres eject or up and down than display moves down

                        Comment

                        • tibimakai
                          Badcaps Legend
                          • Jan 2012
                          • 3680
                          • USA

                          #13
                          Re: LCD 2DIN CAR radio screen problem

                          Check the ribbon cable for damages, between the LCD and the main unit.
                          I'm not familiar with this receiver, some pictures may help.

                          Comment

                          • stj
                            Great Sage 齊天大聖
                            • Dec 2009
                            • 30985
                            • Albion

                            #14
                            Re: LCD 2DIN CAR radio screen problem

                            i think the main system is not running or as said - a bad connection.

                            Comment

                            • domix
                              Senior Member
                              • Jan 2014
                              • 163
                              • Slovenia

                              #15
                              Re: LCD 2DIN CAR radio screen problem

                              it is this one
                              http://www.chinavasion.com/china/who...WIFI_GPS_DVB-T

                              i will open the main unit when i come home, and than will see. i even dnot know what to press because, i got it that dont' work.

                              Comment

                              • tibimakai
                                Badcaps Legend
                                • Jan 2012
                                • 3680
                                • USA

                                #16
                                Re: LCD 2DIN CAR radio screen problem

                                If he can play a DVD and buttons beep, in my opinion the system it's working.
                                Did you measure the voltage going to the LEDs?

                                Comment

                                • domix
                                  Senior Member
                                  • Jan 2014
                                  • 163
                                  • Slovenia

                                  #17
                                  Re: LCD 2DIN CAR radio screen problem

                                  how can i measure that? dvd wont play, or maybe it is, but i don't know what to pres, autoplay don't work

                                  Comment

                                  • domix
                                    Senior Member
                                    • Jan 2014
                                    • 163
                                    • Slovenia

                                    #18
                                    Re: LCD 2DIN CAR radio screen problem

                                    now i opend main unit, is there something i must to check
                                    Attached Files

                                    Comment

                                    • domix
                                      Senior Member
                                      • Jan 2014
                                      • 163
                                      • Slovenia

                                      #19
                                      Re: LCD 2DIN CAR radio screen problem

                                      any solutions?

                                      Comment

                                      • tibimakai
                                        Badcaps Legend
                                        • Jan 2012
                                        • 3680
                                        • USA

                                        #20
                                        Re: LCD 2DIN CAR radio screen problem

                                        I'm not here only occasionally.
                                        In the last picture there is a red and black wire with a little white connector on top of the board, that supplies the backlight power to the LEDs.
                                        See, if you are getting any voltage there. If they are LEDs, it shouldn't be high voltage there.
                                        If they are CCFL tubes, you most likely shouldn't measure that connector.
                                        I'm not familiar with these units, I have opened up only Kenwoods.

                                        Comment

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