Philips 42FD9944 powersupply failure

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 982
    • Sweden
    #1

    Philips 42FD9944 powersupply failure

    Hello everyone,

    Got a struggling older Philips plasma, model 42FD9944.
    During poweron it crackles and pops from the SMPS, I can read a somewhat unstable PFC voltage of around 390VDC, jumps a few volts up and down.
    VA and VS does not start anymore, recently tried to start up those, but not reach their correct magnitudes.

    Suspect a bad caps SOMEWHERE, there are hundreds in this set.

    Please check the attached pic and let me know if you know what to check.
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

    Tags: None
    • PowerAmpFreak
      Badcaps Veteran
      • Feb 2010
      • 982
      • Sweden
      #2
      Re: Philips 42FD9944 powersupply failure

      Any advice?
      Have to go through the pcb with freeze spray. Hairdryer didn't reveal anything.

        Comment

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA
          #3
          Re: Philips 42FD9944 powersupply failure

          Crackle and popping is not a good sign, where in the SMPS is that coming from? Primary or secondary side?
          Did I leave the soldering iron on?

            Comment

            • PowerAmpFreak
              Badcaps Veteran
              • Feb 2010
              • 982
              • Sweden
              #4
              Re: Philips 42FD9944 powersupply failure

              It's hard to determine which side crackles. I suspect the crackles are, simply, the PFC trying to regulate but the DC/DC is jumpy and won't present a smooth load.

                Comment

                Previous template Next

                Related Topics

                Collapse
                • npielawski
                  MacBook Pro late 2016 (820-00239) with multiple failure modes.
                  by npielawski
                  I will just preface all this by saying that I have a fairly technical background but have never attempted SMD electronics diagnostics and repair before, I really like the idea and want to learn.

                  I have a MacBook Pro late 2016 that died maybe four years ago. Over the course of 30 seconds, it got slower and stuttered, until it froze for a second and died. No click from the trackpad anymore, nothing. I started getting interested in electronics repair and decided to give it a shot, so I opened it, removed the battery (one cell was puffy), took out the motherboard and experimented with...
                  10-15-2025, 01:53 AM
                • Sharpa
                  Repair attempt Philips 55OLED804/12
                  by Sharpa
                  Hello,

                  I bought a SH Philips 55OLED804/12 TV with known defect in an attempt to repair it for personal use.

                  The symptoms when bought: Philips logo appears then tv turns off

                  Things tried so far:

                  1. Powering it on: Philips logo shows on the screen, sometimes with some minor artefacts then shuts down. Red status led flickers rapidly into two batches then repeats
                  2. Put it in recovery mode by pressing joystick down then plugging it to mains: The tv shows the logo then shows the android animation along with some minor artefacts on the screen...
                  11-22-2025, 08:30 AM
                • alro7779
                  Philips 32PFL4901/F8 BA4GF0F0102 2 Not getting standby led
                  by alro7779
                  Hello, guys!

                  The same 32" Philips TV I was having video issues, but now I don't have standby led at all. Someone here shared with me the schematic of the power supply, and checking the voltages, I see right after the resistor R604 I'm getting 1.6 v which is too low for enabling the Gate of the Q601 mosfet (the diagram says 4.2). On the R614 resistor I'm getting 181 V in and 117 V out, then through R603 I'm getting the same 117 V in and 59.9 V out, finally getting the latter voltage in the R604 BUT getting just 1.6 V out, which is the voltage that goes on to the Gate of the Q601...
                  09-14-2025, 12:25 AM
                • 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
                • puccovelli
                  Dell 9310 Memory or RAM (Random-Access Memory) failure (2,4)
                  by puccovelli
                  Hi all, I hope this is the right place to post.

                  I'm having a problem with a Dell 9310 which is posting 2 orange, 4 white lights on startup (hangs on Dell BIOS logo). The service manual says its a RAM failure.

                  I've taken the motherboard out and noticed that one of what looks like an SMA 0805 resistor has blown (see photo). The board is an LA-J144P Rev 2.0(A01).

                  1] Could someone confirm what the component that has blow actually is (and where I could get another from).
                  2] Whether this component is likely to cause the RAM failure issue, and if replacing...
                  10-11-2025, 06:30 AM
                • Loading...
                • No more items.
                Working...