Determine Fuse Size?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • m4a2t0t
    Badcaps Veteran
    • Mar 2013
    • 276
    • USA
    #1

    Determine Fuse Size?

    Have a DV7 notebook with LED display and no backlight.



    SMD labeled JS8 below the left side of the connector. How do I determine the max amperage? I know I can remove the fuse and jump the pads to get it working but if there is another surge it will destroy the mobo and/or panel.

    The panel in the laptop is an LG LP173WD1 (TL) (E1)



    LED Power Input Voltage 7v/12v/20v MIN/TYPICAL/MAX
    LED Power Input Current NA/20mA/25mA
    LED Power Comsumption NA/5.7W/6W
    LED Power Inrush Current 1800mA

    20V fuse and 2A to cover inrush current ?

    Any help appreciated.
    Tags: None
    • reaper57
      Badcaps Veteran
      • Sep 2014
      • 216
      • Norway
      #2
      Re: Determine Fuse Size?

      Well, if you can't find a datasheet for it you can desolder the old one, solder two wires, connect them to a multimeter and check what kind of an amperage is going to the screen (you should set the brightness to max).
      Btw are you sure that the fuse is the problem? Recently I fixed a dv6 on which the backlight wasn't working and it turned out that the cable wasn't properly inserted into the panel.
      Keyboard not detected, press F1 to continue...

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Determine Fuse Size?

          Are you sure Js8 is for the fuse, I see JS6, JS7 close by.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • trebo
              Badcaps Veteran
              • Feb 2010
              • 514
              • Wales, UK
              #4
              Re: Determine Fuse Size?

              have you jumpered the jumper???
              those jumpers are common on boards, you should be able to find one on any scrap M/B

                Comment

                Previous template Next

                Related Topics

                Collapse
                • Document Archive
                  Surface Mount Fuses Fundamentals Datasheet
                  by Document Archive
                  TE Circuit Protection offers the widest selection of surface-mount fuses available for addressing a broad range of overcurrent protection applications. Helping to prevent costly damage and promote a safe environment for electronic and electrical equipment, our single-use chip fuses provide performance stability to support applications with current ratings from .5A up to 20A.

                  TE Circuit Protection also offers the telecom FT600 fuse for telecommunications applications. This telecom fuse helps comply with North American overcurrent protection requirements, including Telcordia, GR-1089,...
                  10-07-2024, 06:07 AM
                • howardc64
                  A1312 (27” iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                  by howardc64
                  Problem

                  This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                  08-04-2024, 10:36 PM
                • corrize
                  A funny fuse story – Lumix LX100 II
                  by corrize
                  Hello, I disassembled this dead camera, and found this WTF… Two fuses soldered one above the other !
                  I was pretty sure nobody touched it before, but that can't be from factory. There is flux, and capacitor is probably missing.
                  The other weird thing : the fuses are « G » fuse : (0.75A – 8V), seems very low. The original fuse should be « O » : (32V 2,5A).
                  There is « O » mark beside. All fuses have the same mark letter on main board. So, I can deduce it's a « O » fuse.
                  And this correspond to the issus I saw : when I plug the battery, I measure the voltage dropping...
                  10-19-2023, 09:58 AM
                • dragometin
                  Hitachi 40HYC42
                  by dragometin
                  TV Model: Hitachi 40HYC42
                  Power Supply: 17IPS71
                  MainBoard: 17MB95M
                  Panel: VES400UNDS-2D-NO3

                  When the set came in it was dead. Fuse was open primary side and the power mosfet was shorted. So I ordered a new power supply. Now it turns on, only displays "Hitachi" and then power off red and blue led flashing.

                  I had to modify the 0ohm resistors in the led backlight of the new PS like the original power supply.
                  Is there any variants on 17IPS71 power supply's?

                  UART output pins 10 and 12 on scart connector:

                  Code:
                  12:24:04.595
                  ...
                  08-08-2024, 05:53 AM
                • jesterace
                  Samsung UE46ES8000 Blown fuse but no other signs of short
                  by jesterace
                  Hi I wonder if anyone might be able to steer me in the right direction. I have this Samsung UE46ES8000 TV and it went bang during use. The main fuse on the PSU board is open. I've checked every diode/mosfet/transistor I can see and nothing appears to be short to cause the fuse to go. The DC output of the bridge rectifier is not short either. I've seen online that some of these models are known for having their PFC mosfet or other mosfets shorting and blowing the fuse but i'm not seeing that here. If anyone aware of these models having any issues to cause this? I'm reluctant to just replace the...
                  09-11-2024, 03:14 PM
                • Loading...
                • No more items.
                Working...