Buttons not working on Samsung LE37S71B

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Dannyx
    CertifiedAxhole
    • Aug 2016
    • 3912
    • Romania

    #1

    Buttons not working on Samsung LE37S71B

    Good day folks. I've got this Samsung TV with a seemingly trivial yet slightly annoying issue: the buttons on the side don't respond AT ALL, not ever erratically like it usually happens when buttons on TVs go bad. Interestingly, I thought the TV was dead when I first got it, because it didn't come with a remote, so I naturally tried the buttons first, which of course got me nowhere. Then just out of curiosity, I grabbed a Sammy remote and the thing fired up perfectly.
    Initially I thought the microswitches were busted, so I replaced one of them just to check but it didn't change anything. Looking at the service manual on page 122 we have the FUNCTION block (see below), but the only thing to check there would be the A5V voltage which appears to be OK (slightly lower than I'd like it, at only 4.8v from what I recall, but considering the remote works, I assume the power section for the buttons is running fine. Doubt it's a software issue, like something becoming corrupt, though I'm not eliminating that theory entirely just yet. Has anyone ever dealt with unresponsive side keys on Sammies before ? If so, what could be the issue, besides the microswitches ? Cheers.
    Attached Files
    Wattevah...
  • vinceroger69
    Badcaps Legend
    • Mar 2012
    • 6714
    • uk

    #2
    Re: Buttons not working on Samsung LE37S71B

    tv stuck in hotel mode?
    With the TV switched on press MUTE - 1 - 1 - 9 - ENTER this takes you direct to hotel mode i think

    Comment

    • Dannyx
      CertifiedAxhole
      • Aug 2016
      • 3912
      • Romania

      #3
      Re: Buttons not working on Samsung LE37S71B

      Originally posted by vinceroger69
      tv stuck in hotel mode?
      With the TV switched on press MUTE - 1 - 1 - 9 - ENTER this takes you direct to hotel mode i think
      I've already accessed the service menu and hotel mode appears to be off, albeit I went INFO-MENU-MUTE-POWER, so maybe that takes me to a different menu. I'll try your method as well
      Wattevah...

      Comment

      • Dannyx
        CertifiedAxhole
        • Aug 2016
        • 3912
        • Romania

        #4
        Re: Buttons not working on Samsung LE37S71B

        Originally posted by vinceroger69
        tv stuck in hotel mode?
        With the TV switched on press MUTE - 1 - 1 - 9 - ENTER this takes you direct to hotel mode i think
        I tried that, but it doesn't seem to do anything, despite reading somewhere else that that IS indeed the code for accessing hotel mode.
        Wattevah...

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #5
          Re: Buttons not working on Samsung LE37S71B

          I once picked up a set where the side button panel ribbon cable had become detached from the IR board. Possibly someone had already tried to repair the set and didn't put it back into place.
          Have you checked that the cable has not been damaged. Perhaps one of the screws cutting through it.
          Willing to help but I'm no expert.

          Comment

          • Dannyx
            CertifiedAxhole
            • Aug 2016
            • 3912
            • Romania

            #6
            Re: Buttons not working on Samsung LE37S71B

            Originally posted by dick_barton
            I once picked up a set where the side button panel ribbon cable had become detached from the IR board. Possibly someone had already tried to repair the set and didn't put it back into place.
            Have you checked that the cable has not been damaged. Perhaps one of the screws cutting through it.
            Forgot to mention that I DID open up the TV but nothing looks out of the ordinary, at least not visibly. Highly unlikely a cable got busted, because the side buttons and IR are connected to the large power button in the middle, which THEN goes to the main board, so considering the remote works, I doubt something's wrong with the connections.
            Wattevah...

            Comment

            • culcuhain
              Senior Member
              • May 2016
              • 186
              • U$@

              #7
              Re: Buttons not working on Samsung LE37S71B

              You might have a stuck button. I picked up a TV where the volume was maxed due to a stuck button. No other buttons would work. Using the remote you have increase the volume and see if it drops on its own. Decrease the volume and see if it increases on its own. Check each microswitch. You IR board where it goes to the main maybe labeled. Check the voltages for each button there.

              Comment

              • vinceroger69
                Badcaps Legend
                • Mar 2012
                • 6714
                • uk

                #8
                Re: Buttons not working on Samsung LE37S71B

                eeprom re set like on the older samsungs where you short two pins and the tv re writes the data back Not sure if it will work on this model or sort the issue out though

                Comment

                • dskall
                  Badcaps Legend
                  • Oct 2016
                  • 2905
                  • usa

                  #9
                  Re: Buttons not working on Samsung LE37S71B

                  You have several key inputs. Do they change voltages when you push buttons?
                  I assume no responsibility for any stupid suggestions I might post.

                  Comment

                  • Dannyx
                    CertifiedAxhole
                    • Aug 2016
                    • 3912
                    • Romania

                    #10
                    Re: Buttons not working on Samsung LE37S71B

                    Originally posted by vinceroger69
                    eeprom re set like on the older samsungs where you short two pins and the tv re writes the data back Not sure if it will work on this model or sort the issue out though
                    No need to "improvise" like that, as I have an EEPROM programmer, so I can take the chip off, read it, back it up and THEN wipe it. I did find a bulged cap on the 5Vsb bus and although the TV worked OK, I read somewhere while working on another TV, that bad filtering can lead to corruption of EEPROMs. Don't know if it's the case here though...
                    Wattevah...

                    Comment

                    • Dannyx
                      CertifiedAxhole
                      • Aug 2016
                      • 3912
                      • Romania

                      #11
                      Re: Buttons not working on Samsung LE37S71B

                      Originally posted by dskall
                      You have several key inputs. Do they change voltages when you push buttons?
                      Yes they do: I get various readings in the range of 1-3v, all of which drop to 0 or thereabouts when I press the keys, so I'd say the keys function normally - it's the main board that's busted. Resetting it via the service menu didn't help. I might try pulling the EEPROM out and wiping it, provided I have the required patience, since it's a "test" TV and doesn't actually require fixing
                      Wattevah...

                      Comment

                      • maxvalutech
                        Badcaps Veteran
                        • Dec 2014
                        • 804
                        • australia

                        #12
                        Re: Buttons not working on Samsung LE37S71B

                        In the small number of voltage checks I have done with control buttons the only one to go to zero was off which went from 3.3v to zero - others changed voltage within a small varied range. ???

                        Comment

                        • attainteddragon
                          Badcaps Veteran
                          • Apr 2013
                          • 764
                          • australia

                          #13
                          Re: Buttons not working on Samsung LE37S71B

                          each input has a different voltage so that the microprocessor can understand the input value. resistive ladder array. so that isn't right.
                          WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                          Comment

                          • Dannyx
                            CertifiedAxhole
                            • Aug 2016
                            • 3912
                            • Romania

                            #14
                            Re: Buttons not working on Samsung LE37S71B

                            Originally posted by attainteddragon
                            each input has a different voltage so that the microprocessor can understand the input value. resistive ladder array. so that isn't right.
                            I must admit I haven't been too thorough in checking, mainly because the schematic was not too easy to interpret...might dig into it further.
                            Wattevah...

                            Comment

                            • maxvalutech
                              Badcaps Veteran
                              • Dec 2014
                              • 804
                              • australia

                              #15
                              Re: Buttons not working on Samsung LE37S71B

                              [QUOTE=attainteddragon;754045]each input has a different voltage so that the microprocessor can understand the input value. resistive ladder array. so that isn't right.[/QUOTE)

                              That's what I'm getting at on the set I just checked again input voltage to buttons pcb is 3.3 and as a button is pressed that voltages drops by a varied amount to say 2.08. 1.65. 0.86. etc. The poster says all his go down to zero so to me seems like button pcb could be shorting.

                              Comment

                              • attainteddragon
                                Badcaps Veteran
                                • Apr 2013
                                • 764
                                • australia

                                #16
                                Re: Buttons not working on Samsung LE37S71B

                                some of these button pcb's have ceramic caps that fail and drag the voltage down.

                                that is where i would be looking first.
                                WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                                Comment

                                Related Topics

                                Collapse

                                • Document Archive
                                  Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
                                  by Document Archive
                                  This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                  09-07-2024, 05:50 AM
                                • elpatxi_bcn
                                  Samsung HG75EJ690UB Hotel TV, change main?
                                  by elpatxi_bcn
                                  Hello!

                                  I just got a Samsung TV model HG75EJ690UB 75" and 4K. It is a hotel TV, with a slightly different version of the Tizen operating system than the TVs at home.
                                  Being a hotel, it is covered in many functions. With the service menu I can unlock some, but not others. For example, I can't install apps like Netflix etc...
                                  The fact is that it seems that I can replace the main by a, say, "normal". I think the one that corresponds is NU7105, ref BN94-02635. At work, which is a convention center and a hotel, I have many TVs from 55" to 85" that...
                                  05-19-2023, 03:21 AM
                                • jesterace
                                  Samsung B2030HD IR Remote Receiver Dead, shorted micom?
                                  by jesterace
                                  Hi,
                                  I have this TV a small 20 inch that works perfectly except for the IR has stopped. I have confirmed that the remote control is fine and tried an alternative and even tried with IR blaster from phone. Remote 100% ok.

                                  Tried installing latest firmware but no change.

                                  TV won't respond to remote at all, not even to bring it out of standby. I have to use the touch sensitive front panel to operate, at which point TV is usable albeit with no remote.

                                  Tried replacing the IR receiver diode/bulb on front panel and no change so put the old one back. After tracing...
                                  10-26-2022, 02:20 AM
                                • Document Archive
                                  Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
                                  by Document Archive
                                  This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                  09-06-2024, 11:40 PM
                                • Document Archive
                                  Samsung Galaxy Book Ion NP930XCJ Notebook Specification for Upgrade or Repair
                                  by Document Archive
                                  This specification for the Samsung Galaxy Book Ion NP930XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP930XCJ boardview and NP930XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                                  09-06-2024, 11:40 PM
                                • Loading...
                                • No more items.
                                Working...