Not Starting HP 470 G1

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • MJ-meo-dmt
    Senior Member
    • May 2016
    • 186
    • South Africa
    #1

    Not Starting HP 470 G1

    Hi.

    I have an HP here that had an issue with the fan pulsing instead of spinning. Upon opening the laptop I found that it had spill marks on it. Which corroded 5 pins on the SMSC KBC1126-NU Chip. Upon removing the chip I found a track thats broken leading to the PWM pin for the fan. I have the chip SMSC replaced and the PMW connection to the fan working. So thats all good now but the laptop isn't working now. For some reason when you plug in the DC adapter the LED stays lid. The fan spins quickly for 1/3 second and then stops. The CPU starts heating up and then cools.. Its like its in a restart loop.

    Any pointers that I can attempt to look at? All the main lines seem fine. Over the whole repair nothing weird happened it was a fairly strait forward repair on the broken track.

    * Note I did remove the SMSC chip and the track I repaired which does the same. Not starting / restarting loop / No display nothing...
    #EDIT: Im looking for a schematic.. that would actually help alot if anyone has one.

    Thanks
    Last edited by MJ-meo-dmt; 06-01-2017, 05:35 AM.
    while alive { live(toFullest=true) }
    Tags: None
    • jasko_jacker
      Badcaps Legend
      • Oct 2014
      • 1137
      • italy
      #2
      Re: Not Starting HP 470 G1

      I haven't schematic but what type of smsc is ? it need to be programmed ?

        Comment

        • MJ-meo-dmt
          Senior Member
          • May 2016
          • 186
          • South Africa
          #3
          Re: Not Starting HP 470 G1

          Hi jasko jacker

          I feel pretty stupid now... But its fine it works I missed some pins as they seemed connected but I hooked up my magnifier and saw that some pins didn't take the solder all the way. So it works great now. Thanks though
          while alive { live(toFullest=true) }

            Comment

            Previous template Next

            Related Topics

            Collapse
            • Takeatry
              Yet another Samsung QLED Boot Loop
              by Takeatry
              Samsung QLED QN50Q — purchased 2022 started experiencing a delay in the picture coming on in the morning less than 2 years later. Did not know the term boot loop at that time. As the loop delay ran into a few minutes did all the recommended troubleshooting, soft and hard reset, changing cables and outlet locations, no help. As the delay increased contacted Samsung tech group and allow them remote access the tv. Tech was moving too fast to see exactly what he was doing but this ultimately it was also no help. Lived with the delay until it stretched out over 6 hours. Pulled of off the back cover...
              2 Photos
              10-04-2024, 02:57 PM
            • blaster_
              Samsung UE49MU6105K - boot loop, horizontal lines
              by blaster_
              Less than a year out of warranty, samsung UE49MU6105K craps out, they've got this designed obsolescence down to an exact science of self destruct when out of warranty...

              Screen started to show horizontal lines and ghosted image at the bottom, then turned off by itself. Did software update, to no avail of the line problem, and got a boot loop after some minutes of watching TV. This boot loop will turn on the backlights for some seconds the sound comes on, the image will turn dark very fast and then it reboots again. Pressing power button will not put it on standby. Disconnecting...
              06-22-2022, 05:19 PM
            • Stefano Crivellari
              Lenovo Legion 5 (15ITH6H) kind of boot loop but not sure
              by Stefano Crivellari
              Hi, I wonder if anyone can help me fix my Lenovo Legion 5 (15ITH6H) laptop. Basically, after a windows update the computer would not boot anymore. When powering on the laptop the screen has no backlight and nothing would show up, using an external monitor did not help. However, the laptop would still spin up the fans and turn on the keyboard backlight. The keyboard backlight intensity function key would work and the power button led and the charging led are also working. I've tried every possible combination of key press and power button hold down time but did not change anything. At this point...
              01-14-2025, 03:49 PM
            • ferah831208
              HP gaming 15-0013dx quanta G3HA no video, screen polarize on and off loop
              by ferah831208
              I have an HP gaming 15-0013dx laptop , motherboard quanta G3HA with AMD Ryzen 5 cpu and Nvidia discrete grsphics card. The laptop turns on and u can see the screen polarizing on and off in a loop but no video signal. All voltages are ok measured and stable (I checked all with oscilloscope). This schematics don't have power sequence but I'm using a similar sequence from another laptop with AMD CPU and I get all to the point CPU must release apu_pwrok and apu_rst#, this signal comes valid only for the period of time the screen is polarized and they disappear and same loop behaviour (active/inactive)....
              12-07-2024, 04:02 PM
            • NolesFan
              Samsung un82ru88000f - Boot loop sort of but can correct with taping of LVDS ribbon
              by NolesFan
              Hello all... TV started boot looping. Opened the back panel and tried to isolate the problem. Just PSB no boot loop. PSB and MB no boot loop. Plug in the LVDS from panel to MB and boot looping starts up. It doesnt matter of order that I plug the LVDS ribbons back in, only 1 and no boot loop but as soon as 2nd one plugs in boot looping. I then noticed a flicker on the screen when I was closing the clip on the harness to the LVDS. Shut the lights off so I can see better, and I noticed as i slowly close it, I will get a picture, but as soon as it clips in, I lose picture and booting happens. So I...
              2 Photos
              10-24-2024, 06:36 PM
            • Loading...
            • No more items.
            Working...