Lenovo LOQ 15APH9 — HDMI Not Detected Fix
HDMI not detected on the Lenovo LOQ 15APH9 Ryzen 7 8745H means the HDMI port does not output a signal to an external monitor or TV, Windows Display Settings shows only the built-in display, or the external display connected via HDMI shows no signal. The LOQ 15APH9 has one HDMI 2.1 port that routes through the NVIDIA GPU and one USB-C port that routes through the AMD Radeon integrated GPU for display output.
Fix 1: Update NVIDIA Driver from Lenovo Support Primary fix
Download the NVIDIA GeForce display driver for the Lenovo LOQ 15APH9 (Machine Type 83DH) from Lenovo Support. Run DDU in Safe Mode to clean the current NVIDIA driver. Install the Lenovo-certified NVIDIA driver. The HDMI 2.1 port on the LOQ 15APH9 routes through the NVIDIA GPU. If the NVIDIA driver is corrupted or incompatible, the HDMI port produces no signal output even when an external display is connected and detected by Windows.
Fix 2: Verify HDMI Cable and Monitor Input
Use a different HDMI cable rated for HDMI 2.1 (48Gbps). Also confirm the external display or TV is set to the correct HDMI input source. On some TVs, the HDMI input selector must be manually changed using the TV remote or source button — the TV does not automatically switch when a signal is detected. Test the LOQ 15APH9 HDMI port with a known-good HDMI cable on a different display to confirm whether the issue is the cable, the display, or the LOQ HDMI port itself.
Fix 3: Update AMD Radeon Driver and BIOS
Download the AMD Radeon display driver and latest BIOS for the LOQ 15APH9 Machine Type 83DH from Lenovo Support. Although the HDMI port routes through NVIDIA, the AMD AGESA firmware update in the BIOS controls PCIe device initialization for both GPUs. An outdated BIOS may not correctly initialize the NVIDIA PCIe slot on the Ryzen 7 8745H Phoenix platform, preventing the NVIDIA GPU from outputting signal through the HDMI port even with a correct NVIDIA driver.
Per Azrul Nizam, media streaming enthusiast using Lenovo LOQ 15APH9 connected to living room TV: “HDMI port showed no signal on the LOQ 15APH9. Changed to a new HDMI 2.1 cable and the signal appeared immediately. The original cable was an HDMI 1.4 cable that did not reliably handshake with the HDMI 2.1 port on the LOQ. Using a matching HDMI 2.1 cable fixed it without any driver changes.”
Fix 4: Check Display Settings for Detected Displays
Open Settings → System → Display. Scroll down and click Detect under the display layout section. Windows sometimes does not automatically detect an external HDMI display if the display is already powered on before the HDMI cable is connected. The Detect button forces a manual display enumeration that picks up displays connected after Windows has already started the display session.
Frequently Asked Questions
Why is HDMI not detected on Lenovo LOQ 15APH9?
The NVIDIA driver is corrupted, the HDMI cable is not rated for HDMI 2.1, the external display input is not set to the correct HDMI source, or Windows did not auto-detect the display after connection. Reinstall the NVIDIA driver from Lenovo Support, use an HDMI 2.1 cable, and click Detect in Windows Display Settings.
Does Lenovo LOQ 15APH9 HDMI port support 4K?
Yes. The HDMI 2.1 port supports 4K at 120Hz and 8K at 60Hz. For 4K at 60Hz, an HDMI 1.4 or higher cable is sufficient. For 4K at 120Hz, an HDMI 2.1 48Gbps cable is required. Older HDMI cables rated for lower bandwidth may work at 4K 60Hz but fail at 4K 120Hz or display signal stability issues at higher refresh rates.
Can Lenovo LOQ 15APH9 output HDMI and USB-C display simultaneously?
Yes. The HDMI port (NVIDIA GPU) and the USB-C port with DisplayPort (AMD Radeon) can be used simultaneously for two independent external displays. The LOQ 15APH9 supports the built-in display plus two external displays for a total of three displays simultaneously. Configure in Windows Display Settings after connecting both external displays.
Is the HDMI port on Lenovo LOQ 15APH9 on the NVIDIA or AMD GPU?
The HDMI 2.1 port routes through the NVIDIA GPU. The USB-C port with DisplayPort Alt Mode routes through the AMD Radeon 780M integrated GPU. This means the NVIDIA driver must be functioning correctly for HDMI output to work, while USB-C display output depends on the AMD Radeon driver.
Conclusion
HDMI not detected on the Lenovo LOQ 15APH9 Ryzen 7 8745H is fixed by reinstalling the Lenovo-certified NVIDIA driver from Lenovo Support for Machine Type 83DH, using an HDMI 2.1-rated cable, confirming the external display input source is set correctly, and clicking Detect in Windows Display Settings. Update the BIOS from Lenovo Support for AMD AGESA PCIe initialization improvements that affect NVIDIA GPU detection on the Ryzen 7 8745H platform.
HDMI quick checks
HDMI port works but image is blurry?
Resolution is not matching. Set external display to native resolution in Windows Display Settings.
HDMI shows display but no sound?
Set HDMI Audio (NVIDIA) as default playback device in Sound settings.
HDMI works at 60Hz but not 120Hz?
Cable is HDMI 2.0 (18Gbps). Replace with HDMI 2.1 48Gbps cable for 4K at 120Hz.
External display flickers via HDMI?
Reseat the HDMI cable on both ends. Cable may be partially inserted or connector is bent.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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