Vestel 17IPS72 R4 BLOWS Q7

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • alltvrepairs
    Badcaps Veteran
    • Jan 2014
    • 219
    • Malta
    #1

    Vestel 17IPS72 R4 BLOWS Q7

    HI

    Need some help here. Led controller mosfet MDD14N25C Q7 bliwing immediately.
    Tried a replacement board and all is fine but would like to repair this.

    Suspecting either transformer shorted or gate drive from Ic. But looking for your opinion if ot is a known fault




    Attached Files
    Tags: None
    • petehall347
      Badcaps Legend
      • Jan 2015
      • 4426
      • United Kingdom
      #2
      Re: Vestel 17IPS72 R4 BLOWS Q7

      check associated resistors and be sure you used a genuine replacement mosfet

        Comment

        • alltvrepairs
          Badcaps Veteran
          • Jan 2014
          • 219
          • Malta
          #3
          Re: Vestel 17IPS72 R4 BLOWS Q7

          Originally posted by petehall347
          check associated resistors and be sure you used a genuine replacement mosfet
          Tks. So far cross checked relative components against diagram but haven't identified the culprit yet

            Comment

            • slybunda
              Senior Member
              • Feb 2012
              • 131
              #4
              Re: Vestel 17IPS72 R4 BLOWS Q7

              C120 - has that got burn marks on its side?

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6363
                  • Germany
                  #5
                  Re: Vestel 17IPS72 R4 BLOWS Q7

                  just bad quality,.,, replace both Chanel at once and be sure u don't have short cable of BL cable behind the screen

                    Comment

                    • alltvrepairs
                      Badcaps Veteran
                      • Jan 2014
                      • 219
                      • Malta
                      #6
                      Re: Vestel 17IPS72 R4 BLOWS Q7

                      Originally posted by slybunda
                      C120 - has that got burn marks on its side?
                      I guess you are referring to C130 47p 2kv. The brown shade is due to the heat of the underlying Mosfet

                        Comment

                        • alltvrepairs
                          Badcaps Veteran
                          • Jan 2014
                          • 219
                          • Malta
                          #7
                          Re: Vestel 17IPS72 R4 BLOWS Q7

                          Originally posted by Diah
                          just bad quality,.,, replace both Chanel at once and be sure u don't have short cable of BL cable behind the screen
                          Sorry what both channels? There is only 1 FET switching on BLs. LEDs work fine with a replacement card.

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • Jane
                              How do you test MOSFET in laptops ?
                              by Jane
                              I tried to use this method:

                              Testing an N-channel MOSFET:

                              Step 1: Discharge the Gate (turn off the MOSFET)
                              Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
                              Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.

                              Step 2: Charge the Gate (turn on the MOSFET)
                              Now, place the red probe on the Gate (G) and the black probe on the                              ...
                              09-27-2024, 03:31 AM
                            • Nooy
                              VGA MOSfet permanently shorted and loss of MOSfet pad
                              by Nooy
                              Hello everyone, I recently found this badcaps site and super Learn Electronics Repair youtube channel. And I wanted to learn how to troubleshoot power supplies and VGA cards and how to practice soldering, since I already have a properly defective piece of them. I am currently trying to solve two problems:

                              I have a Gigabyte GV-RX460WF2OC-4GD type card. I managed to find the faulty MOSfet (AON6414A) on it, which I replaced. The card starts up, but after about half a minute, the MOSfet in the same position will be shorted again. Is it possible that the PWM controller driving the MOSfet...
                              02-14-2024, 02:26 AM
                            • AppleLover123
                              Asus X712EA 3 volts after the first mosfet
                              by AppleLover123
                              Hey guys,

                              i have a asus motherboard here and as the title says after the first mosfet (in the picture) there is nothing more than 3.15v.
                              I injected 19v and max. 1 amp at the charging port and there is not voltage drop or smth. It's just taking 19v and 1 milliamp.
                              Then i tried to inject 19v and max 1amp after the current sensor and there it first takes 19v and 4 milliamps and after 2 seconds it is taking nothing (no current).
                              I measured on the coils on board everything seems fine. Also the main power rail is not shorted (infinite resistance).
                              Now i thought something...
                              12-15-2024, 07:49 AM
                            • MicroSMD Lab
                              ASUS ROG Zephyrus GPU Mosfet repeat failure
                              by MicroSMD Lab
                              The board number is GU502DU. I repaired this a couple weeks ago and it came back with the same issue, same mosfet failed (PQH9201). I'm hoping that the GPU was spared this time.
                              I used the same replacement part (purchased from Mouser) and I'm certain the soldering was done properly since it took just as much effort to remove as before. What could cause this same mosfet to fail? I'm thinking if it was unsuitable then the others would fail too. I looked for similar failures on YTube and the mosfet was replaced with AOE6930 in one instance and AOE6932 in the other but it's possible that the...
                              01-10-2024, 06:36 AM
                            • Scotchmist
                              Asus GA502D keeps blowing mosfet
                              by Scotchmist
                              I have an Asus GA502D, it had a blown mosfet which I replaced and the laptop booted into windows, a few mins later it shut off, the same mosfet was blown. I thought maybe just a bad mosfet but same thing happened again, a few mins in windows and shuts off.

                              I have removed the mosfet and can run the laptop no problem

                              The MOSFET is FDPC5018SG

                              Can anyone point me in the direction of what could be the cause of this, could it be the controller rt3663bc?

                              Thanks
                              08-24-2024, 02:23 PM
                            • Loading...
                            • No more items.
                            Working...