MSI GF63 MS-16W21 - Black Screen LCD - Working HDMI

[mavaro]

Hello,
I have an MSI GF63 laptop with a MS-16W21 motherboard on my table, and there is no image on the LCD screen. However, when connected via HDMI, the image displays correctly.

Voltages on the EDP 40-pin connector pins:

3pin = 012V,
5pin = 1.75V,
6 pin = 5V,
7 PIN = 3.3V
32 PIN = 2.2V
33 - 36 PIN = 3.3V
38-40PIN - 19V

PU21 - MP2143

1 - 5V
2 - 5V
3 - 3.3V
4 - 0V
5 - 3.3V
6 - 0V
7 - 0.6V
8 - 3.3

Help me please

[mavaro]

Help me please

[mcplslg123]

Measure voltage on pin14/15 of edp connector.
Is it dimm display issue or no display issue on internal screen?
The measurement given are for PU21 or PU22?

[mavaro]

EDP

14 - 0V
15 - 0V

PU21

Laptop working HDMI

[mavaro]

I had no way to test the matrix on another laptop, I ordered a new original one for MSI. The effect is the same, no image. The voltage +3V_LCD appears for a moment and drops to 0V

[mcplslg123]

Dont have the exact boardview/schematic for this model in my database. I beleive PU21 is responsible for generating +3V_LCD. If yes, then there should be a coil nearby PU21 where this +3V_LCD goes.
Try de soldering this coil and measre resistance to GND on both sides of this coil( on the IC side+ on the edp side).
Share the values.

[mavaro]

IC 7.5kohm / edp 8kohm - replacement MP2143 , +3V_LCD will appear for a moment and then drop to 0

[mon2]

What are the full topside markings on PU22 (drives the power rail to the LCD)?

Post a clear pic of this part. Have only the boardview file for this model. Would you have a full schematic?

If you are also missing the image then there may be a mux (multiplexer) that steers the data from the graphics processor to HDMI or this target LCD.

[mavaro]

I am posting a photo - PU21 system, as a precaution I did a PCH reflow, programmed the BIOS.

[mavaro]

the signal EDP_OD# is from the KBC kb9548qf2 BGA chip, shouldn't it be 3V?

[mcplslg123]

De-solder PL20 and inject 3V on edp connector side from another source. Do you get display?

[noipi]

Check also the lid sensor at the back of your display connector which is U24 that gives +3valw and backlight on

[mavaro]

On the PL20 coil I have a constant voltage of 3.3V all the time, on U24 I have +3VALW, U21 pin 4 - BL-ON 0V.