TV SMD Cap question

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Hellfiya
    iPhone Repair
    • Mar 2017
    • 16
    • United States

    #1

    TV SMD Cap question

    So I had a friend bring in a 55" Westinghouse TV(Model: DWM55F1G1) with no picture but it had blacklight and audio. I first checked out the T-Conn board, which everything appeared ok, so after I tried doing the half display test. I plugged in one side to the tconn board and sure enough, one side would display output. I plugged in the other side and nothing.

    I checked the board that was soldered to the display panel and found a short in a line and two bad caps(One was shorted, but the other had some black dots on it. I removed them both and the short was gone, and both sides would display image with no tears or artifacts, stress tested under HD videos for 3-hours.

    I can't find any schematics on this model, and the unit seems to work ok without the SMD caps. Would it be safe to leave them off?

    I thought about pulling the caps from the other side of the other board(I don't know the name) to check the capacitance value, but I have no experience ordering SMD ceramic caps or finding their voltage value without schematics.

    I've attached two images of the caps desoldered: CA23 and CA33
    Attached Files
  • Hellfiya
    iPhone Repair
    • Mar 2017
    • 16
    • United States

    #2
    Re: TV SMD Cap question

    Actually, after watching it for a bit, I did notice that the blacklight may be off at the 1/3 and 2/3 position of the screen(horizontally and vertically). It's not noticeable unless viewed at an angle greater than about 45 degrees. From a direct view, it looks completely normal. I'm not sure if it had always been like this or if the missing caps is causing it.

    Comment

    • Hellfiya
      iPhone Repair
      • Mar 2017
      • 16
      • United States

      #3
      Re: TV SMD Cap question

      Nevermind, disregard the last post. I have confirmed with the owner that the backlight has always been like that. Guess I will just leave off the caps since it works fine.

      Comment

      Related Topics

      Collapse

      • momaka
        HannStar Hanns-G HC194d LCD monitor repair
        by momaka
        Normally, I never post repairs this quick after I do them, because… I am usually very slow. But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
        03-15-2023, 10:17 PM
      • eryjus
        Heathkit IO-4205 Power Supply Caps
        by eryjus
        Hello,

        First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.

        I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.

        I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
        ...
        05-10-2023, 11:21 AM
      • momaka
        Seasonic B12 BC-550 – barely 2 years old and with BAD CAPS already!
        by momaka
        I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.

        For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).

        https://www.badcaps.net/filedata/fetch?id=3591771


        https://www.badcaps.net/filedata/fetch?id=3591772

        It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:

        https://www.badcaps.net/filedata/fetch?id=359177...
        03-12-2025, 03:42 PM
      • momaka
        Casing Power MPT-301 [PCB ATX9806b-p REV: A3]
        by momaka
        This one should make @Pentium4 smile (if he is still reading BCN forums) – I got a new old stock / open box Casing Power MPT-301 PSU on eBay for $4 total.


        Yes, it’s a very generic-looking box, but the manufacturer isn’t (at least not back in the days), which is…

        Macron Power Technology Co. LTD.

        Let’s look at the PSU itself.



        The shell/case also appears quite generic, like many “sold-with-the-PC-case” units. However, the shell is well-formed and has decent steel thickness. In terms of...
        06-02-2021, 10:05 PM
      • Paxman_Swede
        Identifying caps on an old Zoom 9000
        by Paxman_Swede
        Hello!

        I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.

        The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.

        I have studied the board and...
        01-14-2025, 09:51 AM
      • Loading...
      • No more items.
      Working...