Work the layers in order
Most digital menu board troubleshooting goes wrong because people start at the software and work backwards. Start at the bottom instead. Five layers, in this order:
- Power to both the screen and the player
- Input on the screen, and the cable between them
- Handshake between player and display
- Network on the player
- Content in the software
Roughly four out of five faults resolve in the first three layers, and those three take about ninety seconds to check. Reaching for the dashboard first is how a wrong-input fault becomes a service call.
Symptom table
| Symptom | Most likely cause | First thing to try |
|---|---|---|
| Completely black, no backlight glow | Screen has no power, or standby | Power cycle the display at the wall |
| "No signal" or input message | Wrong HDMI input, or handshake failed | Cycle inputs, then reboot player before the screen |
| Screen on, showing vendor logo | Player booted but content did not load | Check player network, then re-push content |
| Old prices displayed | Player is offline and showing cached menu | Check link and IP on the player |
| Wrong daypart showing | Player clock or timezone wrong | Verify timezone on the player, not the dashboard |
| Layout cut off at the edges | TV overscan | Set the display picture mode to Just Scan / 1:1 |
| Colours washed out or too dim | Eco or energy-saving picture mode | Switch to Standard or Dynamic, disable ambient dimming |
| One panel of a set is different | That player pulled a stale version | Force sync that player, check its clock |
| Player will not pair | Blocked outbound network or captive portal | Move it off guest Wi-Fi, check outbound access |
| Screen goes dark overnight | Display's own sleep timer, not the software | Disable the TV's sleep and auto-off settings |
Black screen, in detail
Start by working out which device is dark.
If there is no backlight glow at all and no on-screen message when you press a button on the remote, the display itself has no power. Check the wall socket, the cable, and whether an installer put it behind a switched circuit that the closer turns off at night. That last one is more common than it sounds.
If the display responds but shows "no signal", the screen is fine and the problem is between it and the player. Cycle through the HDMI inputs: a power cut often brings a TV back on input 1 while the player sits on input 2.
If you have the right input and still nothing, you likely have a failed HDCP handshake. Displays and players negotiate content protection at connect time, defined as part of the HDMI specification, and if the screen powers up after the player the negotiation can fail silently.
The fix is boot order: screen first, then player. Power the display, wait ten seconds, then power the player. If a board reliably comes up dead after a power cut, a $15 delay-on relay on the player's supply permanently solves it.
Stale prices
A board showing yesterday's price is usually behaving correctly. Good player software caches the last known good menu and keeps displaying it when it cannot reach the internet, which is exactly what you want at 7pm on a Friday.
So treat stale content as a network symptom, not a content symptom:
- Is the Ethernet link light on at the player?
- Does the player have an IP address, and is it the one you expect?
- Can it reach the internet, or is it stuck behind a captive portal?
- Only then: did the change actually publish in the dashboard?
If a board goes stale repeatedly and it is on Wi-Fi, stop troubleshooting and run a cable. Our internet requirements guide covers the bandwidth and network setup properly.
Wrong daypart
Almost always the player's clock or timezone. Dayparts are evaluated locally so that they still fire when the connection drops, which means the player's own idea of the time is what matters, not the dashboard's.
Check the timezone on the device. Then check it again after a daylight-saving change, which is when a fleet of boards quietly starts serving breakfast an hour late. If you run several locations across timezones, verify each one individually: this is the classic multi-site fault covered in the multi-screen sync guide.
Overscan and picture mode
Two display settings ruin more layouts than any software bug.
Overscan crops roughly 2-5% off every edge, which eats your bottom row of prices. Set the display's aspect or picture size to Just Scan, 1:1, Screen Fit or Full Pixel depending on the brand. Design with a 5% safe margin regardless.
Eco picture mode dims the panel and shifts colours, and many TVs enable it by default plus an ambient light sensor that dims further in a bright room. Turn both off. A menu board should run at a fixed brightness so it looks identical at 8am and 8pm.
When it is genuinely the hardware
Three signs you have a real failure rather than a configuration issue: visible banding or dead lines on the panel, a player that gets hot and reboots on a cycle, or a screen that has been progressively dimming for months.
That last one is why commercial panels matter. Consumer TVs are not rated for 16-hour days and they fade in a way that is easy to miss until you put a new screen next to an old one. The hardware guide covers the commercial-versus-consumer distinction.
Frequently asked questions
Why is my digital menu board showing a black screen?
In order of likelihood: the display is on the wrong input, a HDCP handshake failed because the screen booted after the player, the display lost power, or the cable failed. Cycle inputs first, then reboot with the screen powered up before the player.
Why is my menu board showing old prices?
The player has almost certainly lost its internet connection and is correctly displaying its cached menu. Check the link light, then whether it has a valid IP address, before assuming a publishing problem.
Why did my board not switch to the lunch menu?
The player's clock or timezone is wrong. Dayparts are evaluated on the device so they keep working offline, so a device with the wrong timezone will switch at the wrong hour regardless of what the dashboard says.
Why are the edges of my layout cut off?
Overscan on the display. Set the picture size to Just Scan or 1:1. Also keep a 5% safe margin in your templates so cheap displays cannot eat your content.
How do I stop the screen turning off at night?
Disable the display's own sleep timer, auto-off and no-signal power-down settings. These live in the TV's menu, not the signage software, which is why they are so often missed.
Fix the boot order once
If you only do one preventative thing, make it this: ensure the display always powers up before the player. A delay relay or a smart plug with a staggered schedule eliminates the single most common post-power-cut fault permanently.
Everything else on this page is a five-minute check. MenuPi reports player and screen status from one dashboard so you know which layer to check before you walk out front.