1989 Sylvania Superset TV - Burning Smell

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Vitam
    Class A Geek
    • Aug 2017
    • 45
    • United States

    #1

    1989 Sylvania Superset TV - Burning Smell

    Hi! I cannot get the model number, but I have a 1989 Sylvania superset 13" TV. It works good after I adjusted the convergence and focus, but I noticed, on some areas of the board (mostly near the flyback) there is a "hot" or burning smell. The set works, however. No smoke. It's like when you turn on your heater after it being off all year, that bad smell. What is causing this, and is it dangerous?


    UPDATE! I found a heatsink, with an ic on it, that is VERY VERY hot. It's pretty dusty too. Why is it doing this, can it be fixed?
    Last edited by Vitam; 08-14-2017, 07:00 PM.
  • RukyCon
    A Fake Rubycon
    • Jan 2017
    • 816
    • USA

    #2
    Re: 1989 Sylvania Superset TV - Burning Smell

    If you haven't used the TV in a long time then dust could have built up and now that it's running the dust is burning off.

    The dust should not be too much of a problem [unless everything inside is covered in dust or the dust is blocking any vents] but you can get inside of it and use some canned air to blow the dust out if you need to.
    I'm not a expert, I'm just doing my best.

    Comment

    • Vitam
      Class A Geek
      • Aug 2017
      • 45
      • United States

      #3
      Re: 1989 Sylvania Superset TV - Burning Smell

      I found the TV on the side of the road. I'll clean it, then see is there's any difference.

      Comment

      • Vitam
        Class A Geek
        • Aug 2017
        • 45
        • United States

        #4
        Re: 1989 Sylvania Superset TV - Burning Smell

        Okay even after through air compressed cleaning, it still makes the smell. what?!!!

        Comment

        • Vitam
          Class A Geek
          • Aug 2017
          • 45
          • United States

          #5
          Re: 1989 Sylvania Superset TV - Burning Smell

          Even after cleaning, it still makes the smell. What can this be?

          Comment

          • RukyCon
            A Fake Rubycon
            • Jan 2017
            • 816
            • USA

            #6
            Re: 1989 Sylvania Superset TV - Burning Smell

            Can you post some photos.
            I'm not a expert, I'm just doing my best.

            Comment

            • Vitam
              Class A Geek
              • Aug 2017
              • 45
              • United States

              #7
              Re: 1989 Sylvania Superset TV - Burning Smell

              Ok, one moment please

              Comment

              • Vitam
                Class A Geek
                • Aug 2017
                • 45
                • United States

                #8
                Re: 1989 Sylvania Superset TV - Burning Smell

                This is where I suspect the smell to be coming from.

                Close up

                Comment

                • Vitam
                  Class A Geek
                  • Aug 2017
                  • 45
                  • United States

                  #9
                  Re: 1989 Sylvania Superset TV - Burning Smell

                  Also, this set appears to be made by Philips Consumer Electronics.

                  Comment

                  • RukyCon
                    A Fake Rubycon
                    • Jan 2017
                    • 816
                    • USA

                    #10
                    Re: 1989 Sylvania Superset TV - Burning Smell

                    Are you able to read the numbers on the IC? That may be helpful.
                    I'm not a expert, I'm just doing my best.

                    Comment

                    • Vitam
                      Class A Geek
                      • Aug 2017
                      • 45
                      • United States

                      #11
                      Re: 1989 Sylvania Superset TV - Burning Smell

                      I don't think I can.

                      Comment

                      • Vitam
                        Class A Geek
                        • Aug 2017
                        • 45
                        • United States

                        #12
                        Re: 1989 Sylvania Superset TV - Burning Smell

                        I'll try later. Will remove chassis.

                        Comment

                        • Agent24
                          I see dead caps
                          • Oct 2007
                          • 4913
                          • New Zealand

                          #13
                          Re: 1989 Sylvania Superset TV - Burning Smell

                          Looks like you are talking about the HOT (horizontal output transistor)? They do typically run rather warm, which is why they need the heatsink. But some faults can cause them to run incorrectly and oveheat, too.

                          You might want to have a look at: http://www.repairfaq.org/samnew/tvfaq.htm to start with, especially;
                          http://www.repairfaq.org/samnew/tvfaq/tvhorkboeh.htm and http://www.repairfaq.org/samnew/tvfaq/tvoldertvs.htm
                          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                          -David VanHorn

                          Comment

                          • Vitam
                            Class A Geek
                            • Aug 2017
                            • 45
                            • United States

                            #14
                            Re: 1989 Sylvania Superset TV - Burning Smell

                            Okay, nevermind the IC! I found this near the front of the board chassis.

                            What can I do about this? This is definitely where the smell is coming from. Definitely smelled like "hot fiberglass" !

                            Comment

                            • RukyCon
                              A Fake Rubycon
                              • Jan 2017
                              • 816
                              • USA

                              #15
                              Re: 1989 Sylvania Superset TV - Burning Smell

                              Do you have a multimeter?
                              I'm not a expert, I'm just doing my best.

                              Comment

                              • Agent24
                                I see dead caps
                                • Oct 2007
                                • 4913
                                • New Zealand

                                #16
                                Re: 1989 Sylvania Superset TV - Burning Smell

                                There is an overvoltage problem or a overload on the power rail supplied by those resistors, I would guess.

                                You probably need a schematic at this point
                                "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                -David VanHorn

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: 1989 Sylvania Superset TV - Burning Smell

                                  This can be normal after some time if the resistors run hot. It doesn't necessarily indicate a fault.
                                  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

                                  • R_J
                                    Badcaps Legend
                                    • Jun 2012
                                    • 9515
                                    • Canada

                                    #18
                                    Re: 1989 Sylvania Superset TV - Burning Smell

                                    I'v seen lots of tv's where the resistors get hot like this, I would check there solder connections and maybe clean and resolder them if they look bad. If there was any real problem I'm sure it would effect the picture in some way.

                                    Comment

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

                                      #19
                                      Re: 1989 Sylvania Superset TV - Burning Smell

                                      I can see 12V TP12 and 80/90V TP15. Measure the Vdc at these Test Points. If they are read what is written on the Bd, then I would think you don't have problem.

                                      Comment

                                      • Vitam
                                        Class A Geek
                                        • Aug 2017
                                        • 45
                                        • United States

                                        #20
                                        Re: 1989 Sylvania Superset TV - Burning Smell

                                        R_J, I had to adjust the picture when I got the set. I had to adjust the convergence and flyback brightness and focus controls. Is this a fire hazard, or is the set safe to use until it dies?

                                        Comment

                                        Related Topics

                                        Collapse

                                        • howardc64
                                          LG 65UQ8000AUB no backlight burning smell
                                          by howardc64
                                          Only 3 years old. Owner said backlight went out and burning smell. Didn't bother plugging in to check if had power LED. Just opened the TV rear and found shorted bridge rectifier diode on the backlight circuit on the PSU. SF26G (400V 2A super fast recovery rectifier link ) diode replace with SF26 (what I had on hand) Google AI said G = Green Components.

                                          Burn looked pretty bad on the board but just was blackened carbon coating material. Scraped and cleaned off quite well and clean solder pad for the new diode.


                                          ...
                                          06-07-2025, 10:38 PM
                                        • RetroComputingGrotto
                                          IBM LTO 7 Tape Drive - Dust Sensors??
                                          by RetroComputingGrotto
                                          I have a Quantum SuperLoader robotic tape library that uses an IBM LTO 7 tape drive which is constantly complaining that it needs cleaning. If you insert a cleaning tape, it performs the clean and resets the cleaning counter to 0 hours. It should only require cleaning every 50 or so working hours but after as little as just 1 hours use it requests cleaning. We've purchased a new cleaning tape along with new LTO backup tapes but that has not resolved the problem.

                                          I have taken the library apart and can see no noticeable signs of dust inside. I have removed the tape drive from the...
                                          09-19-2024, 01:54 AM
                                        • beetle1303
                                          Carver CM-1090 - Power relay clicking on & off, then fuse blown after 20-30 seconds of power cycling.
                                          by beetle1303
                                          I gotten a Carver CM-1090 amplifier from a friend who has kept it in storage for decades. Opened it up, thick layer of dust cumulated everywhere. Vacuumed it semi-cleaned, and blown off as much as possible the remaining dust. This is a 220V version.

                                          On initial powered up with nothing connected - it works with all the lights and button indicator lit up as pressed, etc. I then powered off, connected a CD player into the CD RCA input and powered it on. It seemed to work for a short while and when I turned the volume up and down to see the the VUs works, the power started to clicked off...
                                          01-13-2025, 08:49 PM
                                        • stormanimal83
                                          Gigabyte B450 Aorus Pro stuck at VGA LED, burning hot LED Controller MCU 1 under PCI slot...
                                          by stormanimal83
                                          Hey....

                                          Board as written in description was stuck at VGA LED. common Problem wit these type of bords.... tried all the "standard stuff" like resettin... reseatin.... found out the LED Controller MCU1 = IT8295FN-56A geting burning hot under the last PCI Slot.. now i desoldered it cause there were only 18 ohms at the caps arround.... another aorus x470 in working condition with similar part and nearly same layout had arround 280 ohms...

                                          my question is: why doesnt the board start know without this chip.... worked myself through the boardview but i can“t understand...
                                          01-18-2024, 02:15 PM
                                        • howardc64
                                          Macbook Dust-Gate Preventive Cleaning
                                          by howardc64
                                          Just did this on my 2021 13" MBP M1. Dust-Gate design flaw still present. Depending on cleanliness of the operation environment (often eating while using MB is probably the worst). Periodic cleaning is probably warranted.

                                          Note this is quite challenging effort. One misstep will damage the LCD flex and render it useless. So take it to someone more experienced if uncertain.

                                          https://www.ifixit.com/Guide/MacBook...leaning/177920
                                          10-09-2024, 10:10 AM
                                        • Loading...
                                        • No more items.
                                        Working...