Vestel 17MB82S Only backlight

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  • Andreasbest
    Badcaps Legend
    • Aug 2014
    • 1133
    • Hellas ( Greece )

    #1

    Vestel 17MB82S Only backlight

    Hello.
    I got a 17MB82S that give me only backlight, no picture and no sound (not sure about sound as i cannot see if the screen is in HDMI,TV,Scart or USB) no OSD at all too.
    Attached Files
    Last edited by Andreasbest; 10-04-2017, 09:43 AM.
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #2
    Re: Vestel 17MB82S Only backlight

    Have voltage to t-con?
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • Andreasbest
      Badcaps Legend
      • Aug 2014
      • 1133
      • Hellas ( Greece )

      #3
      Re: Vestel 17MB82S Only backlight

      Hello.
      Really sorry for the delay, i forgot the whole tv and today i remember it!
      Yes i have voltages like 3.3v and 1v. I can write you all voltages at all pins if you want.
      Thank you very much!

      Comment

      • Andrew F. Ali
        Badcaps Legend
        • Jan 2014
        • 2450
        • Trinidad & Tobago

        #4
        Re: Vestel 17MB82S Only backlight

        Voltage to T-CON means to ask if you have 12Vdc supply voltage to the T-CON Bd. Look at the T-CON Bd. at the bottom of the TV near to where the FFC from the Main Bd. enter the T-CON Bd. There should be a fuse to measure that you have voltage on both sides.

        Comment

        • Andreasbest
          Badcaps Legend
          • Aug 2014
          • 1133
          • Hellas ( Greece )

          #5
          Re: Vestel 17MB82S Only backlight

          Yes fuse has voltage (12v) on both pins.

          Comment

          • Dannyx
            CertifiedAxhole
            • Aug 2016
            • 3912
            • Romania

            #6
            Re: Vestel 17MB82S Only backlight

            Having the exact same issue....any ideas ? Will try reflashing the firmware via USB just for the heck of it...not like anything can go worse than it already is...
            Wattevah...

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Vestel 17MB82S Only backlight

              If you have USB to RS232 cable you can check the UART debug output on the SCART port, some of the pins are connected to the TV's Linux kernel debug UART.
              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

              • Andreasbest
                Badcaps Legend
                • Aug 2014
                • 1133
                • Hellas ( Greece )

                #8
                Re: Vestel 17MB82S Only backlight

                So the problem is clearly in mainboard?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Vestel 17MB82S Only backlight

                  No, there's a chance the panel could be bad as well.
                  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

                  • Dannyx
                    CertifiedAxhole
                    • Aug 2016
                    • 3912
                    • Romania

                    #10
                    Re: Vestel 17MB82S Only backlight

                    +1 - most likely faulty panel
                    Wattevah...

                    Comment

                    • Andreasbest
                      Badcaps Legend
                      • Aug 2014
                      • 1133
                      • Hellas ( Greece )

                      #11
                      Re: Vestel 17MB82S Only backlight

                      How can i be sure before the order of the replacement board?

                      Comment

                      • Dannyx
                        CertifiedAxhole
                        • Aug 2016
                        • 3912
                        • Romania

                        #12
                        Re: Vestel 17MB82S Only backlight

                        Originally posted by Andreasbest
                        How can i be sure before the order of the replacement board?
                        Well if it appears to be responding to the remote, I'd most definitely say it's a faulty panel, though it would be nice if you could confirm by "asking" the TV if everything's alright via some sort of interface like someone around here suggested, though I haven't got a clue how you could achieve that without an RS232 interface actually present on the 17mb82s....perhaps someone knows a clever trick or workaround for the purpose....
                        Wattevah...

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Vestel 17MB82S Only backlight

                          17MB62 is similar, I believe


                          The UART is on pin 10 (TX) and pin 12 (RX). You may need to reverse RX and TX on your UART device. You will also need to connect to the ground of the TV, on pin 4 and 5 for instance, or the chassis.
                          Make sure to use a 3.3V or 5V UART, not a proper RS232 level device with +/-10V levels which may be fatal to the TV CPU.
                          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

                          • Dannyx
                            CertifiedAxhole
                            • Aug 2016
                            • 3912
                            • Romania

                            #14
                            Re: Vestel 17MB82S Only backlight

                            How about the CH341 I use for flashing EEPROMs ? I have successfully used that in the past for serial purposes so it should work
                            Wattevah...

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Vestel 17MB82S Only backlight

                              CH341 on its own should work.
                              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

                              • Davi.p
                                Badcaps Legend
                                • Sep 2009
                                • 4265
                                • Italy - Milan

                                #16
                                Re: Vestel 17MB82S Only backlight

                                Why CH341 should work? I haven't read it has rs232 comm port on it..
                                I have bought it by ebay but the only info i have is a little specs list on the ebay listing, daoes anyone have a source for the full use of it? That there is something not clear..
                                thanks..

                                Comment

                                • Dannyx
                                  CertifiedAxhole
                                  • Aug 2016
                                  • 3912
                                  • Romania

                                  #17
                                  Re: Vestel 17MB82S Only backlight

                                  Originally posted by Davi.p
                                  Why CH341 should work? I haven't read it has rs232 comm port on it..
                                  I have bought it by ebay but the only info i have is a little specs list on the ebay listing, daoes anyone have a source for the full use of it? That there is something not clear..
                                  thanks..
                                  I have successfully used the CH341 to communicate via serial with a router, so I know it can be done. You just have to make sure it's in serial mode and not SPI mode. This stumped me a lot when I first tried it, since despite all sources claiming it CAN do serial interfacing as well, I couldn't get it to show up as a COM port....until I eventually discovered what the little jumper cap on it was for: removed it and I was now in serial mode. The physical layout will differ based on what programmer you get, but the chip itself can do serial via RX/TX....quite versatile IMO.
                                  Wattevah...

                                  Comment

                                  • Davi.p
                                    Badcaps Legend
                                    • Sep 2009
                                    • 4265
                                    • Italy - Milan

                                    #18
                                    Re: Vestel 17MB82S Only backlight

                                    Thanks for the info and sorry for this OT but if anyone can link to me a page with an user manual i thank him very much 'cause i have a Security Alarm Control Panel board with an ATMEL 24C64AN that doesn't answer to the read function by the programmer.. i have to discover installer code, and there are no indications on what is there for the jumper cap.

                                    Comment

                                    • vinceroger69
                                      Badcaps Legend
                                      • Mar 2012
                                      • 6714
                                      • uk

                                      #19
                                      Re: Vestel 17MB82S Only backlight

                                      https://onetransistor.blogspot.co.uk...schematic.html

                                      Comment

                                      • Davi.p
                                        Badcaps Legend
                                        • Sep 2009
                                        • 4265
                                        • Italy - Milan

                                        #20
                                        Re: Vestel 17MB82S Only backlight

                                        thanks for the info, the jumper meaning is now clear, i found the reason why my ATMEL chip it doesn't read, it works only at 5vcc, i powered it externally and reading's ok and found the installer's code! I'don't know why there's no jumper for 5v/3v selection, i will try to modify that..

                                        Comment

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