With the laptop on etc try shining a flashlight at an angle close to the laptop screen and check if you can detect any images.
They will be very faint if there so trying this in a darkened room may help to see them
''If you can see images'' then there's a backlight problem with the display.
Either a faulty backlight power circuit on the motherboard, a faulty LVDS cable/cable connection between the motherboard and the display or a faulty display.
I realize that you said that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights are OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
What is the motherboard's board number? Knowing this may help to find the schematic as I think that they may be needed.
=== Update (04/12/23) ===
@krispurchase
You mentioned that you can get into BIOS using the external monitor as the display is this correct?
This is very strange as normally BIOS is not available to external displays. External displays only become available to be used after Windows is loaded and then you can't get back into BIOS
Looking through the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=41#manual|maintenance and service guide] it shows that there's an option in BIOS to make the laptop display as a "secondary" display and an external monitor presumably as the primary. Maybe that's why it shows the logo on startup but then you see nothing after that because it's switched the output away from the laptop display.
Perhaps the BIOS has become corrupted.
Maybe try a power refresh and check if that restores the BIOS back to factory defaults.
-
* Turn of the laptop if on and then disconnect the charger if connected.
+
* Turn off the laptop if on and then disconnect the charger if connected.
* Remove the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=81#manual|main battery] from the laptop.
* Disconnect the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=94#manual|RTC coin cell battery] from the motherboard. When the RTC battery is out measure its voltage. If it is <2.5V DC replace it. Search online for ''CR2016-WR'' to find suppliers that suit you best.
* ''Press and hold the laptop's Power button for a full 30 seconds and then release it.''
* Reconnect the RTC battery (or its replacement), reassemble the laptop, reinstall the main battery, reconnect the charger and check if the laptop turns on with its display OK.
If it does there may be a message about the date and time being incorrect. This is normal as the BIOS has been reset. When the D&T have been corrected the message won't appear the next time that the laptop is started.
With the laptop on etc try shining a flashlight at an angle close to the laptop screen and check if you can detect any images.
They will be very faint if there so trying this in a darkened room may help to see them
''If you can see images'' then there's a backlight problem with the display.
Either a faulty backlight power circuit on the motherboard, a faulty LVDS cable/cable connection between the motherboard and the display or a faulty display.
I realize that you said that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights are OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
What is the motherboard's board number? Knowing this may help to find the schematic as I think that they may be needed.
=== Update (04/12/23) ===
@krispurchase
You mentioned that you can get into BIOS using the external monitor as the display is this correct?
This is very strange as normally BIOS is not available to external displays. External displays only become available to be used after Windows is loaded and then you can't get back into BIOS
Looking through the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=41#manual|maintenance and service guide] it shows that there's an option in BIOS to make the laptop display as a "secondary" display and an external monitor presumably as the primary. Maybe that's why it shows the logo on startup but then you see nothing after that because it's switched the output away from the laptop display.
Perhaps the BIOS has become corrupted.
Maybe try a power refresh and check if that restores the BIOS back to factory defaults.
* Turn of the laptop if on and then disconnect the charger if connected.
* Remove the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=81#manual|main battery] from the laptop.
* Disconnect the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=94#manual|RTC coin cell battery] from the motherboard. When the RTC battery is out measure its voltage. If it is <2.5V DC replace it. Search online for ''CR2016-WR'' to find suppliers that suit you best.
* ''Press and hold the laptop's Power button for a full 30 seconds and then release it.''
-
* Reconnect the RTC battery (or its replacement), Reinstall the main battery, reassemble the laptop, reconnect the charger and check if the laptop turns on with its display OK.
+
* Reconnect the RTC battery (or its replacement), reassemble the laptop, reinstall the main battery, reconnect the charger and check if the laptop turns on with its display OK.
If it does there may be a message about the date and time being incorrect. This is normal as the BIOS has been reset. When the D&T have been corrected the message won't appear the next time that the laptop is started.
With the laptop on etc try shining a flashlight at an angle close to the laptop screen and check if you can detect any images.
They will be very faint if there so trying this in a darkened room may help to see them
''If you can see images'' then there's a backlight problem with the display.
Either a faulty backlight power circuit on the motherboard, a faulty LVDS cable/cable connection between the motherboard and the display or a faulty display.
I realize that you said that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights are OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
What is the motherboard's board number? Knowing this may help to find the schematic as I think that they may be needed.
+
+
=== Update (04/12/23) ===
+
@krispurchase
+
+
You mentioned that you can get into BIOS using the external monitor as the display is this correct?
+
+
This is very strange as normally BIOS is not available to external displays. External displays only become available to be used after Windows is loaded and then you can't get back into BIOS
+
+
Looking through the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=41#manual|maintenance and service guide] it shows that there's an option in BIOS to make the laptop display as a "secondary" display and an external monitor presumably as the primary. Maybe that's why it shows the logo on startup but then you see nothing after that because it's switched the output away from the laptop display.
+
+
Perhaps the BIOS has become corrupted.
+
+
Maybe try a power refresh and check if that restores the BIOS back to factory defaults.
+
+
* Turn of the laptop if on and then disconnect the charger if connected.
+
* Remove the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=81#manual|main battery] from the laptop.
+
* Disconnect the [link|https://www.manualslib.com/manual/273050/Compaq-Armada-M700-Series.html?page=94#manual|RTC coin cell battery] from the motherboard. When the RTC battery is out measure its voltage. If it is <2.5V DC replace it. Search online for ''CR2016-WR'' to find suppliers that suit you best.
+
* ''Press and hold the laptop's Power button for a full 30 seconds and then release it.''
+
* Reconnect the RTC battery (or its replacement), Reinstall the main battery, reassemble the laptop, reconnect the charger and check if the laptop turns on with its display OK.
+
If it does there may be a message about the date and time being incorrect. This is normal as the BIOS has been reset. When the D&T have been corrected the message won't appear the next time that the laptop is started.
With the laptop on etc try shining a flashlight at an angle close to the laptop screen and check if you can detect any images.
They will be very faint if there so trying this in a darkened room may help to see them
''If you can see images'' then there's a backlight problem with the display.
Either a faulty backlight power circuit on the motherboard, a faulty LVDS cable/cable connection between the motherboard and the display or a faulty display.
-
I realize that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights are OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
+
I realize that you said that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights are OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
What is the motherboard's board number? Knowing this may help to find the schematic as I think that they may be needed.
With the laptop on etc try shining a flashlight at an angle close to the laptop screen and check if you can detect any images.
They will be very faint if there so trying this in a darkened room may help to see them
''If you can see images'' then there's a backlight problem with the display.
Either a faulty backlight power circuit on the motherboard, a faulty LVDS cable/cable connection between the motherboard and the display or a faulty display.
-
I realize that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights is OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
+
I realize that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights are OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
What is the motherboard's board number? Knowing this may help to find the schematic as I think that they may be needed.
@krispurchase
With the laptop on etc try shining a flashlight at an angle close to the laptop screen and check if you can detect any images.
They will be very faint if there so trying this in a darkened room may help to see them
''If you can see images'' then there's a backlight problem with the display.
Either a faulty backlight power circuit on the motherboard, a faulty LVDS cable/cable connection between the motherboard and the display or a faulty display.
I realize that the logo splash screen is being shown so what I said above doesn't make much sense as you would think that the backlights is OK but if you can see images then something is causing the backlights to turn off - lid switch perhaps idk.
What is the motherboard's board number? Knowing this may help to find the schematic as I think that they may be needed.