Dell Laptop Black Screen Problem (Fixed!) — Latitude 7490 No Display / Boots to Black Screen
Is your Dell laptop turning on but the screen stays black? In this step-by-step guide I show real fixes on a Dell Latitude 7490: checking power, doing a power-drain/EC reset, testing the AC adapter (≈19.5V), disconnecting the main battery (F3YGT, 60Wh, 7.6V), clearing CMOS, and reseating/cleaning RAM. These same steps often apply to Inspiron, XPS, Vostro, Latitude 5000/7000, and G-Series models.
What you’ll learn
How to tell if your Dell actually has power (keyboard backlight, Caps Lock LED, front LED)
Fast power-drain (hold power 30+ sec) to recover from a black screen/“no POST”
Safely disconnecting/reconnecting the main battery and CMOS/RTC to clear glitches
RAM reseat/clean to fix “turns on but no display” issues
When it’s the charger, battery, LCD, or system board — and how to test quickly with a multimeter
Related Dell resources you can check after the video: CMOS reset/NVRAM clear and display troubleshooting from Dell Support. These cover RTC/CMOS reset, Safe Mode, diagnostics, and LCD/BIST checks.
Timestapms (Chapters)
00:01 Intro — symptoms & models
00:28 Power check (LEDs/backlight) + try AC adapter
01:05 Power-drain reset (hold Power 30s)
02:00 When it boots to logo then black screen
02:28 Open the laptop (Latitude 7490)
03:05 Disconnect main battery (F3YGT) — wait 60s
03:55 Clear CMOS/RTC — unplug/replug
04:45 Reseat & clean RAM modules
05:45 Reassemble & test on battery
06:20 Final checks & what to do next
Tools & parts shown
Phillips screwdriver
Multimeter (check ~19–20V at adapter tip)
Soft eraser (clean RAM contacts)
Dell Latitude F3YGT battery (reference)
Try these in order (quick reference)
Unplug everything → hold Power 30–60 sec (power-drain).
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Test wall outlet/charger → confirm ~19.5V with a multimeter.
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Disconnect main battery for 60–90 sec → reconnect firmly.
Clear CMOS/RTC (unplug coin-cell/RTC cable briefly) to reset firmware/NVRAM.
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Reseat/clean RAM (both slots).
If still black: run LCD-BIST/diagnostics (F12) or test with an external display.
If your searching for…
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Compatible lines (common symptoms)
Latitude 5490/5420/7420/7490 • Inspiron 3000/5000/7000 • XPS 13/15 • Vostro • G-Series (many fixes overlap)
If this helped, drop a comment with your model (e.g., Latitude 7490/XPS 15) and what fixed it. Like & subscribe for more Dell troubleshooting!
Hashtags
#Dell #DellLatitude #BlackScreen #NoDisplay #LaptopRepair #Dell7490 #TechFix #Windows11 #Troubleshooting
(Source: YouTube Channel Smart Devices Channel)
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