5 genuinely useful ways to use the serial port on the back of your TV


If you look at the back of your TV, there are many ports that you probably never use. Some older TVs include an RS-232 serial port similar to those that you’d find on the back of old PCs. While the main uses of this port include professional diagnostics and servicing, there are several ways you can use your TV’s serial port for other things.

Read the TV’s current state

Know the state of the TV for certain

Tuya Wi-Fi IR Blaster on a wooden desk. Credit: Adam Davidson / How-To Geek

I’ve been controlling my TV using smart home software for more than a decade. I started off relying solely on an IR blaster that could send the same signals as my infrared TV remote. Over time, more and more functionality has been taken over by other methods, such as using dedicated smart TV integrations in Home Assistant.

I still use IR to control my TV, as it’s not easy to get my TV to power on reliably from standby using smart home integrations. To get my TV to turn on, I use the IR blaster to send out the same signal as my remote control sends when I press the power button.

The problem with IR is that it doesn’t always work. If something is blocking the TV when the signal sends from the IR blaster, the TV doesn’t turn on. My smart home thinks that the TV is on, however, since the signal to turn it on has been sent. It can cause automations to stop working correctly.

Home Assistant has now added support for ESPHome serial proxies, so you can connect an ESP32-based RS-232 proxy to your TV and control it through the serial port if your TV supports serial commands. Not only does this make the TV power on more reliably, but you can also poll the state of the TV to determine for certain whether it’s on, what the volume level is, which input is being used, and more, making automations rock solid.

USB-C to DB9 serial (RS-232) adapter cable with a 9-pin connector and a USB-C plug on a white background.

Brand

OIKWAN

Cable Type

USB-C

A USB-C to RS-232 cable adapter that alllows a modern PC to communicate with older hardware or industrial systems.


Wake a TV from standby

Serial control can fix deep sleep problems

A person holding an infrared TV remote. Credit: Tim Brookes / How-To Geek

Another benefit of using the serial port on the back of your TV is that it can wake the TV from standby. Some TVs can be woken using Wake-on-LAN commands, but these can sometimes fail when the TV goes into deep sleep. The TV’s network interface may be unreachable, so the power-on command fails.

By sending signals through the serial port, you can bypass the TV’s sleeping network interface. If your TV supports serial wake commands in standby, sending the appropriate command through the serial port can wake the TV and power it on, removing one of the most frustrating issues of TV automations.

Turn on the TV when the PC wakes up

Reliably wake your TV

The Hisense 55A85K 55-inch 4K 120Hz OLED TV connected to a gaming PC playing The Elder Scrolls IV: Oblivion Remastered. Credit: Ismar Hrnjicevic / How-To Geek

You can use a TV as a monitor for your PC, whether you’re gaming or using your PC as your home theater source. Most of the time things work fine, but you can experience problems trying to get your TV to turn on when the PC wakes.

While a standard monitor may power on correctly when the PC wakes, your TV may refuse to do so, since this isn’t its primary intended purpose. Some users have managed to use the serial port to solve this problem.

Using a simple script on your PC, you can send a signal through the serial port telling your TV to power on whenever your PC wakes up. This means that when you wake your computer, your TV will automatically turn on too.

Switch inputs when devices become active

No more manual HDMI input selection

HDMI-CEC can make selecting the right inputs for your TV a little easier. When I power up my PS5, for example, my TV automatically switches to the correct HDMI input. However, I have more HDMI devices than ports, so I use an HDMI switcher for other devices such as my Nintendo Switch 2.

Using my HDMI switcher, HDMI-CEC doesn’t work, so when I power on my Switch, the TV doesn’t change to the appropriate input. Using the serial port, you can send commands to switch to specific inputs, so it’s possible to create automations that will switch to the correct input when you power on a device, even when HDMI-CEC can’t manage it.

Use a TV as an information display

Show dashboards or images on the TV

A close-up of Samsung SmartThings on a Frame TV. Credit: Bertel King / How-To Geek

Your TV is probably the biggest screen in your home, but it often only gets put to use for a fraction of the day. You can use your TV to do more than just watch shows and movies. For example, you can use a TV to display smart home dashboards, family calendars, weather information, security camera feeds, or photo slideshows.

While the serial port doesn’t allow you to display content directly (you’ll need to do this through the usual video inputs, such as HDMI), it does allow you to control when your TV turns on, which input it displays, and how loud the volume is. You can have your TV turn on at a set time, switch to the input that displays your smart home dashboard, mute the volume, and then turn everything off again at a specific time.


Don’t sleep on your TV’s ports

Many of the ports on the back of your TV can feel a little pointless, such as serial ports, USB ports, or optical audio ports. There may be more you can do with them than you realize.



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Recent Reviews


There’s a special kind of panic that hits at 11 p.m. on a Tuesday when you Google “can someone sue me personally for my freelance business” and the answer is, technically, yes. I know this because I lived it. For fourteen months, I ran a growing consulting side hustle- invoices, contracts, the whole act- under exactly zero legal structure. I didn’t choose to be a sole proprietor. I just never chose to be anything else, which, it turns out, is the same thing.

The wake-up call came from a client’s offhand comment about “your LLC,” followed by my very convincing silence. That night I fell into a research hole so deep I emerged the next morning having read seventeen tabs on liability shields, self-employment tax, and something called “piercing the corporate veil” that sounded like a phrase from a divorce lawyer’s memoir. So: is a sole proprietorship secretly a ticking time bomb? Is an LLC the adult, responsible choice, or just expensive paperwork with better branding? Let’s actually work through it.

What Is a Sole Proprietorship, Really?

Here’s the part nobody tells you clearly: if you’re earning money from your own business activity and haven’t filed anything with your state, you’re already a sole proprietor. There’s no form to submit, no fee to pay, no ceremony. You and the business are, legally, the same person. That’s the whole structure.

The upside is real. It’s the fastest, cheapest way to start working for yourself — no filing fee, no separate tax return, no annual report to remember. You just start invoicing. The downside is baked into that same simplicity: there’s no legal wall between your business and your personal life. If the business owes money or gets sued, the business is you, so your savings account, your car, and potentially your house are all fair game.

What Does an LLC Actually Protect You From?

A Limited Liability Company creates a separate legal entity- one that can own things, owe things, and get sued, largely independent of you personally. That separation is the entire point of forming one.

It’s worth being honest about the limits, too. An LLC won’t protect you if you personally guarantee a business loan, if you commingle business and personal funds, or if you’re personally negligent — say, you’re a contractor and you cause an injury through your own carelessness. Courts can “pierce the corporate veil” and go after your personal assets anyway if you treat the LLC as a legal fiction rather than a real, separately run entity. The protection is genuine, but it’s not a force field; it’s a structure you have to maintain.

Which One Actually Costs More to Start?

This is where a lot of the fear around LLCs turns out to be overblown, and a lot of the assumed simplicity of sole proprietorships turns out to be incomplete.

Sole Proprietorship LLC
Setup paperwork None required (unless operating under a different name) Articles of Organization filed with your state
State filing fee $0 $35–$500 depending on state (national average is roughly $130)
Ongoing state fees Typically none Many states require an annual report; fees range from $0 to $800+ (California’s franchise tax is the notable outlier)
Separate business bank account Optional Strongly recommended to preserve liability protection
EIN required Only if hiring employees Recommended even for single-member LLCs, to avoid using your SSN

A sole proprietorship is still the cheaper entry point in dollar terms. But “cheaper to start” and “cheaper overall” aren’t the same question — it depends what a lawsuit, a bad debt, or a messy tax season would actually cost you.

How Do Taxes Actually Differ?

This is the part I got wrong for months, assuming an LLC meant a whole new tax regime. It doesn’t, automatically. By default, both a sole proprietorship and a single-member LLC are taxed identically: profits and losses pass through to your personal tax return, and you pay self-employment tax (15.3%, covering Social Security and Medicare) on your net earnings.

The actual tax advantage of an LLC isn’t automatic — it’s optional. A single-member LLC can elect to be taxed as an S-corporation once profits reach a meaningful level, which can reduce self-employment tax by letting you pay yourself a “reasonable salary” and take remaining profit as a distribution not subject to that 15.3%.

That election involves added complexity — payroll processing, additional filings — so it’s rarely worth it for a business bringing in a few thousand dollars a year. It becomes worth asking about once net profit is consistently well into five figures.

Does an LLC Actually Make You Look More Credible?

Here’s a question I didn’t expect to matter as much as it did: does “LLC” after your business name change how people treat you? Anecdotally, yes. Some clients, vendors, and lenders treat an LLC as a signal of seriousness — rightly or not — the way a business bank account or a proper invoice template does. It’s not a guarantee of better contracts, but it removes a small, avoidable hesitation from a prospective client’s mind.

It also matters for banking and financing. Business lenders and some payment processors are more comfortable extending credit to a registered entity with its own EIN and bank account than to an individual operating under their own name.

Do You Still Have to Report “Beneficial Ownership” in 2026?

If you researched this a year or two ago, you may still be carrying around outdated fear about the Corporate Transparency Act’s beneficial ownership information (BOI) reporting rule — the one that threatened steep penalties for LLC owners who didn’t file. Here’s the current state of play: in March 2025, FinCEN issued an interim final rule that removed the BOI reporting requirement for domestic U.S. companies and U.S. persons entirely. As of today, that requirement applies only to foreign entities registered to do business in the U.S. — not to a typical American-owned single-member LLC.

That said, the underlying law hasn’t been repealed, courts have upheld its constitutionality, and FinCEN’s final rule is still pending in 2026, meaning the rule could tighten again with limited notice. A small number of states have also introduced their own versions; New York’s LLC Transparency Act took effect January 1, 2026, but after a late amendment, it applies only to foreign LLCs doing business in New York, not typical in-state LLCs. The short version for most small business owners forming a domestic LLC in their home state: this isn’t currently a filing you need to worry about, but it’s worth a five-minute check-in with a professional if your situation involves foreign ownership or multiple states.

So, Which One Should You Actually Choose?

There isn’t a universally correct answer, but there is a useful set of questions. How much personal risk does your work actually carry — a freelance copywriter has a different exposure profile than someone renovating properties or handling clients’ money. How much profit are you actually generating, since that determines whether the tax flexibility of an LLC is relevant yet. And how much administrative overhead are you willing to take on, since an LLC does require you to actually treat it like a separate entity — separate bank account, its own paperwork, its own discipline.

If you’re testing an idea with minimal financial exposure and low risk of being sued, operating as a sole proprietor while you validate the business is a completely reasonable starting point- you can always convert to an LLC later, and most people do exactly that. If you’re already generating consistent revenue, working with clients under contracts, or doing anything with meaningful liability exposure, the cost of forming an LLC is generally small next to what it protects.

I eventually filed mine on a Wednesday afternoon, paid my state’s filing fee, and felt almost anticlimactic about how undramatic the process actually was compared to the spiral that preceded it. If you’re standing where I was, at least you can skip the 11 p.m. panic-Googling, you already know what the seventeen tabs would have told you.



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