Technician helping troubleshoot Motorola phone screen brightness not working

Steve H.

Reviewed for technical accuracy

Specialities: Samsung screen sharing issues (Smart View / screen mirroring / casting), “can’t find TV”, “won’t connect”, same Wi-Fi checks, permissions.

Samsung screen sharing not working: common reasons + what to check first (Smart View can’t find TV, screen mirroring won’t connect, casting issues, Wi-Fi, permissions, updates)

Technician avatar Technician
Hi — we can sort this out step by step. When Samsung screen sharing stops working, it’s usually something small (network, permission, or a device setting) — but the fixes depend on how you’re sharing.

Trust moment: I don’t want you to do anything risky (like resets) before we confirm the simple causes. We’ll start with the safest checks first.

Quick questions so I point you the right way:
• What are you sharing to: a Samsung Smart TV, Roku, Chromecast/Google TV, Fire TV, or a Windows PC?
• Are you using Smart View / Screen Mirror, or “Cast” from an app (YouTube, Photos, etc.)?
• What happens exactly: “TV not found”, “connects then drops”, or “black screen / no sound”?
• Did this start after an update, a new router, or a password change on Wi-Fi?
Customer
I’m trying to share my Galaxy phone to my Samsung TV. It used to work. Now Smart View doesn’t find the TV half the time, and when it does it connects then disconnects. I’m not very technical and I’m nervous I’ll break something.
Technician avatar Technician
You’re doing the right thing by going slow. “Finds sometimes / disconnects” is usually a network handshake issue, not a broken phone or TV.

Safe Step 1 — Confirm the #1 requirement (same Wi-Fi)
I’ll keep this simple: your phone and TV must be on the same Wi-Fi network name (not just “same internet”). Many homes have two names like “Home-WiFi” and “Home-WiFi-5G”. If one device is on one and the other is on the other, Smart View can act random.

Can you check the Wi-Fi name on your phone, and the network name on the TV? Just tell me if they match exactly.
Customer
My phone is on “SmithHome-5G”. The TV says “SmithHome”. Are those different? Also I sometimes use a Wi-Fi extender.
Technician avatar Technician
Yes — that’s often the whole story. They can be treated as two separate lanes. Smart View expects both devices to be reachable on the same local network.

And the extender matters too: if your phone is on the extender’s Wi-Fi but the TV is on the router’s Wi-Fi (or vice versa), discovery can fail or drop.

Trust moment: I’m not going to have you change router settings. First we’ll do “no-risk” checks you can undo easily.

Safe Step 2 — Quick consistency test
For one test only, connect your phone to the same exact Wi-Fi name the TV uses (or move the TV to the same one the phone uses). Then try Smart View again.

If it becomes stable, we’ve confirmed it’s a network split (5G vs 2.4G or extender vs router), not a phone problem.
Customer
Okay, I switched the phone to “SmithHome” and now it sees the TV more often. But it still disconnects sometimes. This started after my TV did an update last month.
Technician avatar Technician
That’s helpful. After updates, it’s common for Smart View permissions or TV-side sharing settings to “tighten up,” and connections can drop until both sides are up to date and allowed.

Safe Step 3 — Two simple update checks (no settings rabbit holes)
• On the phone: make sure it has the latest system update and the latest SmartThings/Smart View components (updates often fix dropouts).
• On the TV: confirm it’s fully updated (sometimes it downloads an update but needs a restart to finish).

Also, when it disconnects: does it happen only with certain apps (like streaming), or even when you mirror the home screen?
Customer
It disconnects more when I try to share a video app. Photos and the home screen last longer. Does that mean something is blocked?
Technician avatar Technician
Exactly — that’s a common “surprise.” Some video apps use content protection (DRM). That can limit what can be mirrored, even if normal screen sharing works for photos or the home screen.

Safe Step 4 — Separate “connection problem” from “content limitation”
Here’s the logic (no heavy tech):
• If your phone mirrors the home screen reliably, the connection is basically okay.
• If only certain apps fail or drop, it may be the app’s sharing limits rather than your phone or TV.

One more question: are you using a VPN on the phone, or “Private DNS / ad blocker” apps? Those can interfere with discovery and streaming.
Customer
I do have a VPN sometimes, yes. And my grandson installed an ad blocker app. Could that really stop screen sharing?
Technician avatar Technician
It can, yes — especially for “finding the TV” and staying connected. VPN and some ad blockers change how the phone routes network traffic. Screen sharing needs local network discovery, and that can get blocked.

Trust moment: I don’t want you uninstalling anything yet. First we’ll do a short, reversible test.

Safe Step 5 — Quick “clean network” test
For one test session only:
• Turn off the VPN temporarily, then try Smart View again.
• If there’s an ad blocker with a “pause” switch, pause it briefly and retest.

If the connection becomes stable during that test, we’ve found a clear direction without deleting apps.
Customer
Okay. Another thing: sometimes the TV shows a pop-up asking to allow the phone, and I’m not sure what to press. I’m afraid I’ll block it.
Technician avatar Technician
That’s a very normal concern. Those prompts matter, and it’s easy to tap the wrong thing once and then wonder why it won’t connect later.

Safe Step 6 — Permission clarity (no guessing)
If the TV asks to allow a device, choose the option that means Allow or Always allow for your phone (not “deny”). If you’re unsure, stop and tell me the exact wording on the screen — we can interpret it together. This is similar to other confusing system prompts people run into on Android; if you’ve ever seen consent pop-ups that don’t make sense, this guide can help explain the pattern: consent screens.

Also: do you try screen sharing while the phone is in Power saving or very low battery? Some phones reduce background networking, which can cause drops.
Customer
Yes, it often happens when my battery is low. And sometimes the phone is charging very slowly too. Could that be related?
Technician avatar Technician
It can be related in the sense that low power mode changes how the phone behaves. When battery is low (or Power saving is on), the phone may limit background connections and performance, which can make screen sharing feel “unstable.” And if the phone is also charging very slowly, it often stays in that low-power state longer.

Safe Step 7 — Quick stability comparison
Try one simple comparison: test screen sharing once when the battery is above ~50% and Power saving is off. If it’s noticeably more stable, we’ve learned something important without changing anything permanent.
Customer
If it still won’t work after these checks, does that mean the TV is broken? And can this be fixed without taking it to a shop?
Technician avatar Technician
Most of the time, no — it’s not a “broken TV.” It’s usually one of these:
• devices not truly on the same Wi-Fi (router vs extender, 2.4 vs 5GHz),
• permission prompt was denied once,
• VPN/ad blocker blocks local discovery,
• TV/phone update mismatch that needs a restart on both sides,
• or a content limitation inside one specific app (DRM).

Safe Step 8 — The “clean restart” rule
A simple restart of the phone and a full TV reboot often clears stuck discovery. It’s not a magic fix, but it’s safe and commonly helps. If it still fails after we confirm the same Wi-Fi, permissions, and no VPN/ad blocker during the test, then we narrow it down to either TV-side sharing settings or the specific app’s limits — not hardware failure by default.

If you tell me just two results — “same Wi-Fi name: yes/no” and “VPN/ad blocker paused test: improved/not improved” — I can guide the next safest step without turning this into a complicated project.
Customer
That makes sense. I’ll do the same Wi-Fi and VPN tests first. Thank you for explaining it without jargon.

Quick answer: the accepted fix

Accepted first fix for Samsung phone screen sharing not working (safe checks):
• Make sure phone + TV are on the same exact Wi-Fi name (watch for 2.4/5GHz and extenders).
• Do a short “clean test” with VPN/ad blocker paused, then try Smart View again.
• Confirm the TV’s Allow device prompt wasn’t denied (don’t guess if wording is unclear).
• Test once with a higher battery level and power saving off to check stability.
• If only certain video apps fail, consider content limits (DRM) rather than a broken TV.

Why Samsung screen sharing stops working (Smart View can’t find TV, connects then drops)

Most “screen sharing not working” problems come from network mismatch (router vs extender, or 2.4GHz vs 5GHz), a denied permission prompt on the TV, or a phone-side blocker like VPN, Private DNS, or an ad blocker. Updates can also change how discovery works until both the phone and TV are fully updated and restarted. If screen mirroring works for the home screen but fails only inside a streaming app, the cause is often a content restriction rather than a hardware fault.

How to tell if it’s Wi-Fi, permissions, an app limit, or a device issue

Use simple comparison tests: confirm both devices are on the same Wi-Fi name, try a short test with VPN/ad blocker paused, and note whether the problem happens everywhere or only in one app. If it connects only when battery is high, power saving may be limiting background networking. If it never finds the TV even on the same Wi-Fi and with blockers paused, focus next on TV-side allow/permission prompts and software updates before assuming hardware trouble.

Samsung screen sharing not working — quick troubleshooting tips

Most cases come from “same Wi-Fi” issues, permissions, VPN/ad blockers, or app content limits.

Quick path: match the Wi-Fi network name on phone and TV (including extenders), pause VPN/ad blocker for a short test, and watch for a TV prompt that needs “Allow.” If mirroring works for photos/home screen but not for a video app, it may be the app’s sharing limits. Keep changes minimal and test one thing at a time so you don’t lose your normal setup.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid changing multiple network/display settings at once. For device-specific guidance, please consult a verified expert on Whizz-Tech or the manufacturer’s support before making decisions.

Additional troubleshooting options

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FAQ

Why did Samsung screen sharing stop working suddenly?

This often happens after a phone/TV update, a Wi-Fi change, or when the phone switches between a router and an extender. A VPN, Private DNS, or an ad blocker can also block discovery. Start by confirming both devices are on the same Wi-Fi name and do a short test with blockers paused.

Smart View stopped working after an update — what should I check first?

After updates, the phone and TV may need a full restart to finish setup changes. Confirm both are fully updated and that the TV didn’t deny the “Allow device” prompt. If it connects then drops, check Wi-Fi consistency (2.4/5GHz or extender) before changing deeper settings.

Is this a hardware problem or a settings/network problem?

Most cases are settings or network related, not hardware. If the phone can mirror photos or the home screen, the connection works in general. If only a specific video app fails, it may be content protection limits rather than a device fault.

Can this be fixed without service?

Often, yes. Matching the same Wi-Fi, allowing the device prompt on the TV, and testing without VPN/ad blocker resolves many cases. If it still won’t connect after those safe checks, the next step is device-specific guidance for your TV model and sharing method.

Sources

Filed under: Screen Display Issues

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