LCD1502DVD 15" TV - No Power

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  • pyrosster
    Member
    • Aug 2013
    • 43
    • Spain
    #1

    LCD1502DVD 15" TV - No Power

    Hello,

    I am trying to troubleshoot a 15" TV that does not turn on, no sounds/relays, etc. dead.
    I checked power supply and there's a broken "resistor fuse". (picture below) What's the value of this "resistor fuse"? 56 ohms? Can I change this with a normal resistor?
    Power supply is 12V 5A.

    Thanks for any opinion or insight
    Attached Files
    Last edited by pyrosster; 09-24-2013, 04:50 AM.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LCD1502DVD 15" TV - No Power

      Is that device original? Could it have been accidentally incorrectly replaced?

      A 15" LCD TV would use about 2 amps on 12V. The 56 ohm resistor would allow an absolute maximum of 12V/56R = 210mA. Therefore, I doubt it is 56 ohms. A value of less than or equal to 0.56 ohms would be expected.
      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

        • pyrosster
          Member
          • Aug 2013
          • 43
          • Spain
          #3
          Re: LCD1502DVD 15" TV - No Power

          Thanks tom66 for your reply.

          The device is original. It's a 15" TV with DVD player. So the fuse resistor could be changed with a 0.56 ohms 1/2W normal resistor?
          The sticker on the PCB (250V/6A) is confusing because the power supply is 12V and the part AZ1084S2 is a low dropout linear regulator.

          Thanks again.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LCD1502DVD 15" TV - No Power

              Does the 12V output from the power jack go anywhere else?
              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

                • pyrosster
                  Member
                  • Aug 2013
                  • 43
                  • Spain
                  #5
                  Re: LCD1502DVD 15" TV - No Power

                  It's very strange. The chassis have this sticker: Power input: 110V-240V 50/60Hz 48W
                  But the mainboard only have a 12V connector and the transformer sticker is 12V 5Amp.
                  The manufacturer changed the design?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: LCD1502DVD 15" TV - No Power

                      Probably printed many stickers and decided to use them anyway..
                      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

                        • pyrosster
                          Member
                          • Aug 2013
                          • 43
                          • Spain
                          #7
                          Re: LCD1502DVD 15" TV - No Power

                          tom66, how can I replace that part? Normal 0.56ohm 1/2W resistor is ok?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: LCD1502DVD 15" TV - No Power

                              I think a fuse will work, I still don't think that's an original part...
                              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

                                • pyrosster
                                  Member
                                  • Aug 2013
                                  • 43
                                  • Spain
                                  #9
                                  Re: LCD1502DVD 15" TV - No Power

                                  What type of fuse? which value?

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: LCD1502DVD 15" TV - No Power

                                      I usually take 1.5~2x input current so 7.5A to 10A that being said a 15" would normally not use more than 2 amps so maybe 3 to 5 amps rating. Slow blow type.
                                      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

                                        • pyrosster
                                          Member
                                          • Aug 2013
                                          • 43
                                          • Spain
                                          #11
                                          Re: LCD1502DVD 15" TV - No Power

                                          Thank you!

                                            Comment

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