Teac DV-B300 bad Daewoo/Partsnic cap

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia
    #1

    Teac DV-B300 bad Daewoo/Partsnic cap

    The power supply circuit: http://www.eserviceinfo.com/download...LST-4100P.html (I entered the model number from another - my mistake )
    The unit is a Sunlin SR691-B01.
    The STB would start with a version display, and would not respond.
    The +5V rail was down to +3.3V, because C7 (Partsnic RM) was faulty (it was also discoloured).
    Replacing all of the electrolytics in the power supply fixed the problem completely.
    A similar story with a bad Partsnic cap in antother STB: https://www.badcaps.net/forum/showthread.php?t=3938
    Daewoo/Partsnic is already on the bad caps list: https://www.badcaps.net/forum/showthread.php?t=388
    Anyone else have a bad experience with such a brand?
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
    Tags: None
    • Scenic
      o.O
      • Sep 2007
      • 2642
      • Germany
      #2
      Re: Teac DV-B300 bad Daewoo/Partsnic cap

      if you mean daewoo with that... well..

      http://bambooz.pytalhost.net/badcaps...i/daewoo-1.jpg
      http://bambooz.pytalhost.net/badcaps...i/daewoo-2.jpg
      http://bambooz.pytalhost.net/badcaps...i/daewoo-3.jpg
      http://bambooz.pytalhost.net/badcaps...i/daewoo-4.jpg

      thats the power supply of a Hyundai ImageQuest L50A 15" LCD Monitor (manufactured september 2001)

      i already recapped it but the voltage still drops from 12V to about 8 to 9V as soon as i connect the LCD -.-
      and the 5V rail drops to 3V.

      so i guess the PSU is half-cooked because of those failed daewoo caps

        Comment

        • gonzo0815
          Badcaps Legend
          • Feb 2006
          • 1600
          #3
          Re: Teac DV-B300 bad Daewoo/Partsnic cap

          Well, have had some of those in a Siemens DSL Modem, but well they lasted four years 24/ 7 in a hot environment.

          @Scenic
          may be you overlooked a shorted zener diode, have had this in a Humax 5100 DVB-S unit with a similar psu.
          There where some 6v and a 15v diode at the secondary side, to protect the other circuits when the psu looses regulation. They short out and have to be replaced.

            Comment

            • Scenic
              o.O
              • Sep 2007
              • 2642
              • Germany
              #4
              Re: Teac DV-B300 bad Daewoo/Partsnic cap

              werd ich morgen mal nach schauen.. bisschen spät jetzt ^^

                Comment

                Previous template Next

                Related Topics

                Collapse
                • Tynan Dill
                  Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                  by Tynan Dill
                  I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                  Upon bringing it home and plugging it up, it showed a standby light.

                  I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                  The screen seems to blackout and stay black, but with a flashlight I can see the display.

                  With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                  Assuming...
                  ORIGINAL POWER SUPPLY BOARD
                  7 Photos
                  11-22-2024, 01:46 PM
                • sam_sam_sam
                  Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
                  by sam_sam_sam
                  I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

                  One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
                  03-31-2024, 02:12 PM
                • sam_sam_sam
                  Modification to a ZD-987 desoldering/soldering station using a external switching power supply
                  by sam_sam_sam
                  I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

                  I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
                  07-01-2024, 06:34 AM
                • shamsudeen
                  Hi, Can we use SMPS Bench Power Supply for Laptop troubleshooting?
                  by shamsudeen
                  Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
                  I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.

                  i know that in linear power supply the noise will be very low comparing to SMPS supply....
                  07-19-2025, 07:14 AM
                • JimBanville
                  Definitive technology SC 2000 subwoofer amp's power supply clicking and popping
                  by JimBanville
                  The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
                  Opened it up and discovered the power supply is making a faint clicking or ticking sound.
                  I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
                  I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles...
                  09-13-2023, 07:21 AM
                • Loading...
                • No more items.
                Working...