Philips 15CN4321 Vintage CRT TV

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • goodpsusearch
    Badcaps Legend
    • Oct 2009
    • 2850
    • Greece

    #1

    Philips 15CN4321 Vintage CRT TV

    The owner of this old (1988) 15" TV tagged it as broken. He claimed that the TV worked but it took some time to turn on and synchronize.

    I plugged it in but it never turned on. So, I decided to open the case and check for bad caps, cold solder, burnt parts, dust etc.

    The original capacitors are a mix of Rubycon, Nichicon, Chemicon, Jamicon and Lelon.

    13 caps were found bad, none of them bulging. Some of them completely open, some had higher esr and lower capacity than normal and some had normal capacity but the esr was a bit higher than the maximum allowed according to the datasheets. All were replaced with Rubycon YXF, Chemicon KY and Nichicon HE, except for a 400V 22uF that was replaced with a HEC 105C.

    The TV didn't turn on. It was stuck on standby mode. What did the trick for me was to press the channel buttons repeatedly. I am impressed with the picture quality of the tube, even though it is 24 years old. The sound is great and there is even a bass setting There are also RCA audio/video in and out connectors!

    I am keeping it.
    Attached Files

Related Topics

Collapse

  • mitchw
    Vintage Philips 4BM2797 CRT BW monitor repair/tuneup
    by mitchw
    I have a Philips 4BM2797 black and white VGA CRT monitor that is very dim. If I put the brightness at medium (indent at the pot), the text is barely visible in a moderately lit room.

    I looked around for a service manual, but was unable to find one. Also there are no G2/Focus adjustments on flyback...
    There is a row of adjustment trimmers, but they aren't marked..

    Anyone has any info about it?
    Thanks...
    01-12-2024, 12:39 PM
  • DrewPhillips
    Capacitor Diarrhea - Nichicon PL Series
    by DrewPhillips
    Hello All, I have on the bench a couple of PSU's which have some failed Nichicon PL series caps. They didn't "puke" their guts through the top, but instead "diarrhea'ed" corrosive brown electrolyte through the bottom, down the legs and onto the board. On one cap, the electrolyte rotted the cap right off the board leaving 2 little stubs, and also corroded a trace on the foil side.

    The PSU's are Power-One MAP series and are ringing-choke topology. The semiconductors have date codes in 1993. The PSU's were used in a commercial application, fan-cooled. They had failed...
    03-02-2025, 10:18 PM
  • nick3092
    Mid/late 80's Nichicon Yellow Caps
    by nick3092
    I recently acquired a set of Bose Roomate speakers from the mid to late 80's. Basically the right speaker cabinet is completely passive, and the left one has the power transformer and amplifier circuit in it. Out of curiosity, I opened it up to see what the circuit looked like. Looks like they used all Nichicon VX (2x 4700uF/16v for smoothing off the bridge rectifier), a couple random Nichicon SE series sprinkled on the board, and what really caught my eye - 2 yellow sleeved Nichicon caps (both 1uF/50v with no real series marking. Below are pictures of the caps. The only thing not shown in these...
    08-28-2022, 03:56 PM
  • G33RT
    Philips 8200 series 65PUS8204/12 stuck at Philips Logo
    by G33RT
    Philips 8200 series 65PUS8204/12 stuck at Philips Logo, it does not reboot it just stays on the logo.

    It does power up when pressing the power button.

    I already try the power button while plugin the plug with no result.
    Also put the latest firmware autorun-TPM191E_R.001.004.100.000.upg on a MBR/FAT32 USB stick at USB port2 with no result either.

    Could this be an PSU or eMMC issue ?
    07-19-2025, 03:43 AM
  • iMic
    Vintage AT Power Supplies - Selecting Capacitors
    by iMic
    Hi,

    Back after a long hiatus with some old power supplies that need repairing. I've recently picked up a couple of 386SX systems, two 486DX systems, a SiliconGraphics Indy and an iMac G3 that either have verified leaking capacitors in their power supplies, or are likely to in the near future. For the sake of simplicity, instead of tackling all at once, I'm starting with the 386's and one of the 486's.


    The 386's power supplies are Seasonic SS4040A's, with caps that are visibly leaking, and 9 replacement caps per unit are required. Most appear to be from the Rubycon...
    02-19-2023, 06:45 PM
  • Loading...
  • No more items.
Working...