dell la-b843p image only on external

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • f-bone
    Senior Member
    • May 2013
    • 92
    • Greece
    #1

    dell la-b843p image only on external

    Hi guys,

    this one seems to work except that there is no image on LCD, only on external via HDMI. I have flashed the bios with a cleanME one and measured voltages at GPU (0.9V) and LVDS connector (LCDVDD_LCD is 19V and DCBATOUT_LCD is 3.3V). I can see the LCD going black after power on but no image. I shed some light with a torch but there is no image or activity at EDP_TX0/1 using the oscilloscope. I also tried a different panel.

    any ideas are welcome.

    br,
    george
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13829
      • Canada
      #2
      Re: dell la-b843p image only on external

      Review the caps that are in series with the EDP lines from the Haswell CPU pins.

      I am not sure if 19v for LCDVDD is correct. Can you review the voltages on U5201?
      Attached Files

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india
          #3
          Re: dell la-b843p image only on external

          lcdvdd cant be 19V as it should be 3.3V. I think you mean DCBATOUT_LCD is 19V. If so that's correct.

            Comment

            • f-bone
              Senior Member
              • May 2013
              • 92
              • Greece
              #4
              Re: dell la-b843p image only on external

              apologies the voltages are the other way around as you mentioned. the caps seem ok i.e. the are not shorted themselves or towards GND.

                Comment

                Previous template Next

                Related Topics

                Collapse
                • larrysito111
                  dell alienware m17 r5 LA-L761P liquid damage no image on lcd 2red 7blue runs on external
                  by larrysito111
                  got here a liquid damaged alienware

                  the laptop had damage in the area of the kb9542qf2 all sorted and now laptop working and turns on but i have no display

                  so if i start and connect usb-c display it works otherwise it is giving me the 2red and 7blue

                  so with the usb-c external monitor is getting to bios and OS

                  otherwise not

                  so if it is in the os and i connect another lcd via onboard hdmi it is working no problem 2 lcds (1 usb-c + 1 hdmi)

                  but still not the internal monitor

                  (tested 3V and 5V going to the...
                  06-12-2025, 04:16 PM
                • andrhouseolly
                  Dell Precision 5510, AAM00 LA-C361P Rev:2.0 turns on, no image.
                  by andrhouseolly
                  Hi.
                  I kindly ask you to help me solve the problem.
                  Dell Precision 5510, motherboard AAM00 LA-C361P Rev:2.0
                  The board turns on, there is no image.
                  Read more. When the power supply is connected, the front panel indicators light up briefly.
                  When you press the power button, the button indicator lights up. The board works
                  there is no image, there is no matrix initialization, there is no image on HDMI.
                  When turned on, the fans do not spin, but when they warm up they start spinning.
                  When you turn off the button, the fans spin up to full speed for a short...
                  05-11-2024, 03:14 PM
                • Bowline
                  Dell E6400 PT434 type Battery Charging Stuck at 1%. Battery Pinouts?
                  by Bowline
                  My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?

                  Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?

                  My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
                  The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
                  I have tried multiple different Dell power adapters. My Dell...
                  06-11-2025, 10:13 AM
                • juergenb
                  Dell Precision 3660 - BIOS Image, Hidden Settings, Thermal Settings ?
                  by juergenb
                  I got my self a new Dell Workstation (Dell Precision 3660, i5-13500).

                  Unfortunately, Dell has fixed the front fan´s settings in the BIOS.
                  Both the speed and the presence of the fan are fixed.

                  There seems to be no hidden setting.

                  The thermal tables for the speeds were changed in one of the last BIOS updates.

                  Do you see a possibility to change these tables from the BIOS update file?

                  Precision_3660_2.1.0 -> Release Notes

                  Updated the thermal table to reduce fan noise.
                  Updated Intel Management...
                  08-12-2023, 03:50 AM
                • justice171
                  Dell G15 Ryzen Edition Display's on External Only
                  by justice171
                  Good day, BadCaps Technician Team,

                  I hope this finds you well.

                  I am reaching out for assistance with a Dell G15 Ryzen Edition laptop that I am currently troubleshooting.

                  The laptop successfully posts on an external screen, but the main screen remains unresponsive. Below are the steps I have taken so far:
                  1. Ordered and replaced the LCD panel and LCD cable.
                  2. Verified that the 19V power rail for the backlight is present.

                  Despite these efforts, the main screen still does not post. I am unsure of the next steps to identify and resolve the issue.
                  ...
                  11-26-2024, 12:02 AM
                • Loading...
                • No more items.
                Working...