Magnavox 42MF237S/37 weak picture

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Toasty
    Badcaps Legend
    • Jul 2007
    • 4171
    #1

    Magnavox 42MF237S/37 weak picture

    Got this in a few months back and finally got around to working on it.

    Initial complaint is that it would not turn off. Found about half of the main PSU caps blown. Did a complete recap of board and reinstalled. Set powers on and off with no issues in that area.

    However, when initially starting the center of the screen looks like someone threw ink at it. The "ink blobs" slowly fade away in the course of about 2 minutes but the center of the picture vertically has a graininess to it and the overall picture is dim and weak.

    Looking for some guidance here as to what to check.

    Panel: Samsung 842AX

    T
    veritas odium parit
    Tags: None
    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA
      #2
      Re: Magnavox 42MF237S/37 weak picture

      I've had this same problem before same model. Couldn't cure it. The panels well used most likely.
      Check vs and VA on startup..Also check vscan.

      From the sounds of it it sounds like vscan may be low. Check this voltage against the panel label.
      Last edited by freakaftr8; 01-17-2014, 11:18 AM.
      Did I leave the soldering iron on?

        Comment

        • Toasty
          Badcaps Legend
          • Jul 2007
          • 4171
          #3
          Re: Magnavox 42MF237S/37 weak picture

          Thanks for the input. I was thinking the panel was shot but needed some confirmation.

          Have a manual or link? Elektrotanya doesn't seem to have this one...

          T
          veritas odium parit

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Magnavox 42MF237S/37 weak picture

              Z-sus or X-main with "ink blobs" problem. not panel.
              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

                • Toasty
                  Badcaps Legend
                  • Jul 2007
                  • 4171
                  #5
                  Re: Magnavox 42MF237S/37 weak picture

                  Was hoping you'd chime in.

                  What about the lightness/weakness of the display?

                  What issues should I look for on those boards?

                  Manual source?

                  T
                  veritas odium parit

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Magnavox 42MF237S/37 weak picture

                      What's the panel in it? LG or Samsung? LG usually have ink blobs issue with Z fault (picture can either be OK or it can be dim) whereas Samsung is usually only dim.
                      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

                        • freakaftr8
                          Badcaps Legend
                          • Oct 2012
                          • 3743
                          • USA
                          #7
                          Re: Magnavox 42MF237S/37 weak picture

                          That model uses samsung.
                          Did I leave the soldering iron on?

                            Comment

                            • Toasty
                              Badcaps Legend
                              • Jul 2007
                              • 4171
                              #8
                              Re: Magnavox 42MF237S/37 weak picture

                              Post 1 - Panel: Samsung 842AX


                              veritas odium parit

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK
                                  #9
                                  Re: Magnavox 42MF237S/37 weak picture

                                  I'd check Ve and fuse on X-main then. Ink blobs rare with Samsung, but suppose it could happen.
                                  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

                                    • Toasty
                                      Badcaps Legend
                                      • Jul 2007
                                      • 4171
                                      #10
                                      Re: Magnavox 42MF237S/37 weak picture

                                      Still looking for a manual. Anyone?

                                      T
                                      veritas odium parit

                                        Comment

                                        Previous template Next

                                        Related Topics

                                        Collapse
                                        • Tr0ll
                                          T-con suspect issue. Both ribbon cables no picture. One ribbon cable ok. (58pus8545)
                                          by Tr0ll
                                          Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.

                                          The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.

                                          Original T-con:
                                          Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.

                                          First replacement T-con:

                                          I thought it might be t-con and ordered new t-con from china(supposedly tested)...
                                          10-07-2023, 07:48 PM
                                        • JJAAMM
                                          SAMSUNG UN55KS9000F picture fades then distorts into vertical lines after 20 seconds
                                          by JJAAMM
                                          This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.

                                          Problem
                                          TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode...
                                          07-06-2023, 06:01 AM
                                        • TR103
                                          Samsung TV model UE50TU: rebooting, backlight, sound, but no picture
                                          by TR103
                                          Hi, I have a Samsung UE50TU with:
                                          - sound and backlight, but no picture
                                          - when it arrived, it had a picture for a few seconds
                                          - it keeps rebooting
                                          - without ribbon cable between the two panel boards, it does not reboot but I have no picture
                                          - without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
                                          - when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.

                                          - without cable between mainboard and lcd panel and with a jumpered...
                                          01-22-2025, 04:12 PM
                                        • sudz28
                                          Magnavox 27MS5402/17 CRT - no picture, flashing green light
                                          by sudz28
                                          I'm going to assume my beloved Magnavox CRT is toast, but also figured maybe this was a good opportunity to dip my toes into he circuitry waters and maybe learn something new. Also, I don't want to trash it if it's a fairly cheap/easy fix!

                                          My 20-year-old Magnavox has gotten me and my kids through many a gaming console change and worked great up until the other day. Following a long distance move, it sat in our garage for a year and now that I brought it in and turned it on I get no picture; instead, a green light blinks on the front of it; 7 flashes, one long flash, then 3 more...
                                          02-08-2022, 10:09 AM
                                        • Mgiffune
                                          Samsung UN60EH6000F Black Screen, Backlight and Sound Good. Power Cycle Returns Picture
                                          by Mgiffune
                                          I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.

                                          I ordered a supposedly ‘new' Tcon board this time, and                                          ...
                                          06-09-2024, 10:28 AM
                                        • Loading...
                                        • No more items.
                                        Working...