I have a Samsung (android 14) with a badly damaged screen for which the lovely manufacturer has no replacements. It is so bad it is effectively useless.

 

Can anyone advise whether it is possible to connect it to another Android - eg my Samsung tablet - so that I can display the contents of the phone on the tablet while using the phone? To make calls, Whatsapp, facebook, etc, not watch videos.

 

Thought this might be a simple question, but net searches keep telling me I should 'mirror' with HDMIs and casting software. I think it should be simpler than that but what I know about this you can write on a pinhead with a pneumatic drill. What I have in mind is more like a visual version of a mobile hotspot. It's not as simple as joining the two devices via USB cable, is it?

No you cannot connect two phones together in order to display one phone's screen on the other. Phones simply don't have the hardware to receive, decode and display an HDMI signal.

 

You *may* be able to use a USB-C to HDMI cable to display your phone's output on a TV or monitor, but you'll have to check your phone's capabilities in that regard (I know Samsung's higer end models do; I don't know about mid range or budget models).

 

Failing that you may be able to wirelessly cast your display to a smart TV.

 

The only way to mirror the display to another *phone* would be with some kind of screen mirroring software; I don't use them so I don't know which ones could work but if you want to investigate further then you can take a look at anydesk, spacedesk or splashtop.

1 hour ago, JayClay said:

Failing that you may be able to wirelessly cast your display to a smart TV.

Thanks for reply, sorry if I failed to make it clear: I want a tablet to act as a stand-in screen for my stricken phone. I very much do NOT want TV or video. I want to use the phone (as per normal) while out and about, only using the tablet to see what is on the phone. HDMI etc just can't be relevant here. 

 

Phone: S21 (victim of the dreaded vertical lines and now impossible to read stuff)

tablet: A7

in case that helps.

8 hours ago, isaanistical said:

Thanks for reply, sorry if I failed to make it clear: I want a tablet to act as a stand-in screen for my stricken phone. I very much do NOT want TV or video. I want to use the phone (as per normal) while out and about, only using the tablet to see what is on the phone. HDMI etc just can't be relevant here. 

 

Phone: S21 (victim of the dreaded vertical lines and now impossible to read stuff)

tablet: A7

in case that helps.

If you want to just see the screen then casting to the TV as already suggested may be an option, Casting will show what ever is on the screen, apps etc

11 hours ago, isaanistical said:

I have a Samsung (android 14) with a badly damaged screen for which the lovely manufacturer has no replacements. It is so bad it is effectively useless.

Where are you located?

Get it repaired at Tukcom if in Pattaya, they have screens for all phones. 

 

I had the girlfriends screen replaced, 1400 baht. 

8 hours ago, isaanistical said:

Thanks for reply, sorry if I failed to make it clear: I want a tablet to act as a stand-in screen for my stricken phone. I very much do NOT want TV or video. I want to use the phone (as per normal) while out and about, only using the tablet to see what is on the phone. HDMI etc just can't be relevant here. 

 

Then ignore the part about TVs and HDMI in the original post, and start investigating the screen mirroring options that I spoke about in my post. They are your only options, unless you get the screen replaced, as per @SAFETY FIRST's suggestion.

 

f I hope one of the provided solutions works out for you.

 

 

.. believe that can only be done  ...phone to p/c or laptop 

 

       such as Microsoft's phone link app ..  and it does work well

 

Lazada has over 4000 results  make sure you get the exact model number..once you have the new screen you can attempt to change it

quite fiddly  or pay a phone shop to fit it  probably best if you have never done the job before.

 

https://www.lazada.co.th/catalog/?q=samsung S21 screen

My oppo has an app called "clone my phone,"used for sending apps back and forth,no WizKid me but an idea.

On 8/24/2025 at 8:11 PM, isaanistical said:

Thanks for reply, sorry if I failed to make it clear: I want a tablet to act as a stand-in screen for my stricken phone. I very much do NOT want TV or video. I want to use the phone (as per normal) while out and about, only using the tablet to see what is on the phone. HDMI etc just can't be relevant here. 

 

Phone: S21 (victim of the dreaded vertical lines and now impossible to read stuff)

tablet: A7

in case that helps.

Do you mean you want to carry a phone, and a tablet, around.

Does Android not have an automatic Back Up facility so you could use that on your tablet or any old phone you may have lying around, as most Thais do.

On 8/24/2025 at 8:11 PM, isaanistical said:

Thanks for reply, sorry if I failed to make it clear: I want a tablet to act as a stand-in screen for my stricken phone. I very much do NOT want TV or video. I want to use the phone (as per normal) while out and about, only using the tablet to see what is on the phone. HDMI etc just can't be relevant here. 

 

Phone: S21 (victim of the dreaded vertical lines and now impossible to read stuff)

tablet: A7

in case that helps.

Yeh that helps.......they are both Samsungs, that's the problem! 555

I would not follow the advice to go to Tukcom. For a number of reasons.

You should source the screen yourself and expect to pay close to 5,000 baht. You will see cheaper options, but they will be of low quality and will not function properly.  The cheaper ones might state AMOLED, but in the small print turn out to be TFT or OLED. You want Dynamic AMOLED 2X with a refresh rate of 120Hz. 

Anyone sending you off to Shopee or Lazada without those specific instructions is leading you up the garden path...

 

Typical example: https://shopee.co.th/product/1212587962/29770987418

As you mentioned, you have zero knowledge of how to do this, I would suggest you consult a phone repair shop.

 

You can get suggestions for a reliable shop near you, on this forum.

 

I have a feeling they will sort you out very quickly, either by replacing your screen (Samsung service is not that good here), or by cloning everything on your phone to another one, that you can buy yourself or get from the shop themselves.

15 hours ago, JakeC said:

I would not follow the advice to go to Tukcom. For a number of reasons.

You should source the screen yourself and expect to pay close to 5,000 baht. You will see cheaper options, but they will be of low quality and will not function properly.  The cheaper ones might state AMOLED, but in the small print turn out to be TFT or OLED. You want Dynamic AMOLED 2X with a refresh rate of 120Hz. 

Anyone sending you off to Shopee or Lazada without those specific instructions is leading you up the garden path...

 

Typical example: https://shopee.co.th/product/1212587962/29770987418

Don't you think that any screen that works is better than one that doesn't.

If Samsung do not list a screen then it is almost certain a clone will be available, probably for less than 1000 baht.

My wife has had many a screen changed on various phones and never been a problem.

@sandyf There are significant differences in the quality of the screens. For example, the phone in question may have at least three different options. Cheapest a TFT LCD that has poorer colour reproduction and only operates at 60Hz. The original has a 120Hz refresh rate. Simple illustration may be scrolling through your picture album. The higher refresh rate will make scrolling much more fluid. You would absolutely notice a difference in performance. 

Next OLED. Again, a lower refresh rate from the original, at 90Hz.

 

Here's an example of someone unknowingly fitting a cheaper screen: https://www.reddit.com/r/GalaxyS21/comments/1cci990/screen_replaced_with_new_oem_screen/

 

I know about this, as I have an iPhone that needed a screen replacement. A bit of research showed me that there were different qualities and the shops around Tukcom were telling me that their screens weren't quite up to standard. 80% of the colour reproduction of the original was her statement. That was only because I did some research and knew what to ask.

I sourced myself an OEM standard screen at half the price they were quoting and took it to a specialist(not around Tukcom) to fit(500 baht). He immediately told me that my screen was an original. The other have washed out colours and some functions won't work. Of course if the OP is happy with a lower quality screen... you should ask them, not me.

But your guess of a clone being under 1000 baht is very obvious nonsense. You literally just made that up. 😊 A clone will be closer to 5,000 baht. For 1,000 baht, expect to be disappointed.

 

 

4 hours ago, JakeC said:

There are significant differences in the quality of the screens.

Your are missing the point. 

Quality becomes superfluous when compared to non functional. 

The OP needs a solution, the easiest solution, not necessarily a top of the range solution.

I am fairly sure he is more interested in where to get a screen and how quickly, than a lecture on the pros and cons.

@sandyf I'm not missing the point. The OP hasn't expressed budget considerations. How is sourcing an original quality screen more difficult than sourcing an inferior one?

You aren't fairly sure about anything, that's just more nonsense from you. Perhaps you didn't note that I actually provided a link to both a lower quality and an original quality screen.

Not only that, but an actual review of the performance of one of the cheaper screens

What is it that you have provided in this thread, other than being argumentative for no good reason?

Do you think it better that no one understands the caveats? Where you somehow offended by my insistence of not using Tukcom? I wouldn't, simply as I have taken three phones to them over time and they broke them all. Added to the likelihood of them using cheaper components, it's a no from me.

The OP can obtain an cheaper screen, but either way, it's better that they understand the caveats. Your arguing is a pointless waste of energy.

Someone catch me up here...  Is the dreaded green line problem on S series Samsung phones actually a screen issue? 

 

It would be a kick in the nuts to spend a wad of money replacing the screen only to find out that doesn't solve the problem.  I'm not claiming to know either way.  When last I went down that rabbit hole (months ago), it seemed that the answer was "complicated".  Fortunately, I have a cheapo A series Samsung and they don't seem affected.

 

2 hours ago, impulse said:

Is the dreaded green line problem on S series Samsung phones actually a screen issue? 

Are you replying in the right thread?

Did you mean to post in this  one -

 

11 hours ago, topt said:

Are you replying in the right thread?

Did you mean to post in this  one -

 

 

I'm responding to this detail by the OP, in his 2nd post:

 

Phone: S21 (victim of the dreaded vertical lines and now impossible to read stuff)

tablet: A7