250V AC Capacitor across input

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • JonathanAnon
    Badcaps Veteran
    • Jul 2012
    • 457
    • Ireland

    #21
    Re: 250V AC Capacitor across input

    Originally posted by budm
    So basically the diagram was wrong? What does the correct diagram look like?
    No No.... the first image I posted was the image from the manual... I photoshopped the second image to represent the circuit as it was after I jumped out the switch / fuse / cap / inrush limiter... I thought it might help people to understand / visualize the changes I'd made, but obviously it didnt work.

    This is the original schematic, to which I have marked in red the section of wire that was open..



    It is still working today, so I think we're good.. Thanks to everybody who helped... A lot of useful information..

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: 250V AC Capacitor across input

      So it is working with the switch bypassed? If that wire is open, you still should have 230V across the Cap.
      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

      • JonathanAnon
        Badcaps Veteran
        • Jul 2012
        • 457
        • Ireland

        #23
        Re: 250V AC Capacitor across input

        Originally posted by budm
        So it is working with the switch bypassed? If that wire is open, you still should have 230V across the Cap.
        After I put the new wire between TL1 and F2 (marked in the schema above), it worked immediately. I reintroduced all of the original components into the circuit and it is still working.. i.e. the circuit now is the same as the schema in my original post with just the wire between TL1 and F2 replaced..

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: 250V AC Capacitor across input

          That does not explain why you were only getting 30V since you have the cap which is in series with the resistor (10 Ohms thermistor) and connected across the line, then the step down transformer, and then the lamp circuits which are also across the line. So basically you have 3 circuits across the line, you can remove any one of them by opening up the wire you then still should have 230v across the other 2 circuits. The voltage reading was not logical at all.
          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

          Related Topics

          Collapse

          • ugamazing
            820-02020 Super Weird Issue: Keyboard Input Character Map "Wrong"?
            by ugamazing
            So, I have a really bizarre issue that I'm struggling to identify the cause of. Working on an 820-02020 board with some bizarre keyboard/input-source character mapping. My suspicion is a possible damaged SPI ROM (U1970), perhaps, but I'm really not sure in this case:

            1. The issue is pretty weird, but when installing MacOS, I noticed my WiFi password did not work. I quickly realized the special characters (!@#$%^& etc) were not mapping correctly.

            2. I noticed the keyboard layout/input-source is defaulting to JAPANESE every single time I restore the board. I am not...
            04-10-2024, 08:06 AM
          • Prolog
            RTX 3080 FE Identifying capacitor
            by Prolog
            Hi people, I hope this is the correct spot to post this, I'm new to the forum.

            I have an RTX 3080 Founders Edition which has a burnt up capacitor (it was in parallel with another capacitor which appears damaged too), so I am hoping to be able to identify the capacitor values and order replacements.

            I hope these photos make it clear which component I am referring to:
            (yes, the soldering is a bit botched from removing the blown one, I know)

            I have found the board schematic (attached), but there does not seem to be a boardview available. I have never...
            12-01-2024, 08:27 PM
          • chth96
            If I replace with inferior capacitor, Is it No harm to other IC components at all?
            by chth96
            I replaced some capacitor which is located on optical pickup pcb which is shown in the table below(PCB #2).Because it have been out of order.
            Now,It works very well,But I just have found that all caps (6svpc100my and other part number as well) ,which is shown in the table below, has ultra-high ripple current spec.
            It is not able to obtain any capacitor which can be a substitute for this ultra-high ripple current nichicon capacitor.
            So I replaced it with samxon and rubycon's general capacitor(GP,YXA series).
            I know that these capacitor will not last as long as nichicon capacitor...
            12-22-2023, 04:34 AM
          • chth96
            How can I test non-polarized capacitor?
            by chth96
            I desoldered samwha NF capacitor(50v 5.6uf) from PCB circuit of 29inch CRT TV which have symptoms of no display after I heard sound of inrush of current to TV whenever I switch on this television.
            I measured ESR value of this non-polarized capacitor(samwha NF capacitor 50v 5.6uf) by means of MESR-100 ESR meter and It displayed 0.3 ohm

            And When I measured its capacitance with digital multimeter and LCR-T4 Mega328 meter, It displayed 10uf from DMM and 8uf from LCR-T4 meter.
            I found catalogue of samwha capacitor(samwha-catalogue_3.pdf file), which is attached to this thread,...
            06-02-2024, 07:31 PM
          • chth96
            Is it no harm to replace with capacitor without ripple current rating?
            by chth96
            When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.


            Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
            But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
            Rubycon YK DataSheet (b...
            04-19-2024, 05:19 AM
          • Loading...
          • No more items.
          Working...