TCL 65S450F no logo, bleeping sounds?

[Diah]

try this... plug out the TV from wall copy the file after extract the zip factory_update_param.aml on root USB stick formated Fat32 or Fat not bigger than 2Gb.. insert first at USB 1 then press power on the TV keep press while you plug the TV in wall... for at least 5-7 second... hope your screen will come on say no data for update but it will wipe the rest in command i wrote in the script.
you may try all USB ports one by one for several time as we dont know which on the Amlogic boot related to USB ports

[nomoresonys]

It's getting interesting

[CapLeaker]

you are lucky as the Soc Amlogic.. it had bootloader section on it which we can trick it with PC..connect yours TV with male to male USB with PC let see how the PC show
here we are with tools

Oyyy... I got to set this up. stby...

[CapLeaker]

try this... plug out the TV from wall copy the file after extract the zip factory_update_param.aml on root USB stick formated Fat32 or Fat not bigger than 2Gb.. insert first at USB 1 then press power on the TV keep press while you plug the TV in wall... for at least 5-7 second... hope your screen will come on say no data for update but it will wipe the rest in command i wrote in the script.
you may try all USB ports one by one for several time as we dont know which on the Amlogic boot related to USB ports

I did this step first:
Took a 4GB USB flash drive and resized it to 1.6GB, formatted it with FAT32 and copied this .aml file to root.
Reassembled the main board and put a new heat pad on it.
Plugged in the USB drive (only one USB on this thing), Pressed the power button and plugged the TV in and kept pressing for 7 seconds. Nothing happened.
Unplugged the TV again for 20seconds, plugged the TV in while keeping the power depressed until it rebooted. Then the USB drive started blinking, so I let it finish.
Unfortunately I didn't see anything on the screen.

Here is what I got out on the USB:

So... this thing is listening on the USB, but I have to see something on the screen yet.

[Diah]

Unplugged the TV again for 20seconds, plugged the TV in while keeping the power depressed until it rebooted. Then the USB drive started blinking, so I let it finish.
Unfortunately I didn't see anything on the screen.

Here is what I got out on the USB:

So... this thing is listening on the USB, but I have to see something on the screen yet.

the android on the stick mean the TV start and booted and sync the usb stick so it write data of android on it.. good sign, it mean also if you fed it with HDMI signal and do change the source you will hear sound
try this

1- dont rezise the stick keep it in full format Fat32 and put the file on it then try..the same way

2- with out stick in USB port if you press power and keep pressing then plug it in wall the Amlogic will call the recovery hope screen come on

3- with out any things as it sart and USB stick blinking... mean it start.. plug the TV with LAN cable to yours router.... log in yours router and check the TV IP... we may use it by using ADB on PC to reboot the TV in recovery

[Diah]

yours TV starting and of sure you have now the audio optic lit red.. and you can hear sound too if there are source.... but now we have the Soc GPU cutting off for some reason
one i described about the Kernel...
second they are load.. so if all above post didn't work for you.. to bring recovery on..
try remove the rest of the back cover to have access to panel buffer boards... and from there we reduce the load by disconnecting the U ribbon cable at each half a time or both side together...

if this didn't bring little part of screen on... then stop and try to find firmware to write it again...

[CapLeaker]

the android on the stick mean the TV start and booted and sync the usb stick so it write data of android on it.. good sign, it mean also if you fed it with HDMI signal and do change the source you will hear sound
try this

1- dont rezise the stick keep it in full format Fat32 and put the file on it then try..the same way

2- with out stick in USB port if you press power and keep pressing then plug it in wall the Amlogic will call the recovery hope screen come on

3- with out any things as it sart and USB stick blinking... mean it start.. plug the TV with LAN cable to yours router.... log in yours router and check the TV IP... we may use it by using ADB on PC to reboot the TV in recovery

Had to put a network switch in here to do all that. O.k. here is what happened:
The exact thing than last time and still nothing on the screen.
I did plug the TV into my network and my switch started blinking. I did an IP scan and the main board does pull an IP address.

I don't think I can change the HDMI, since I can't see anything, unless it is switching automatically to the HDMI port in use.

[Diah]

Had to put a network switch in here to do all that. O.k. here is what happened:
The exact thing than last time and still nothing on the screen.
I did plug the TV into my network and my switch started blinking. I did an IP scan and the main board does pull an IP address.

I don't think I can change the HDMI, since I can't see anything, unless it is switching automatically to the HDMI port in use.

do please as post 106

[CapLeaker]

yours TV starting and of sure you have now the audio optic lit red.. and you can hear sound too if there are source.... but now we have the Soc GPU cutting off for some reason
one i described about the Kernel...
second they are load.. so if all above post didn't work for you.. to bring recovery on..
try remove the rest of the back cover to have access to panel buffer boards... and from there we reduce the load by disconnecting the U ribbon cable at each half a time or both side together...

if this didn't bring little part of screen on... then stop and try to find firmware to write it again...

I already tried to disconnect the ribbon cables. With only one from either side connected / disconnected, both on and both off. That doesn't do squat.
Yeah... firmware... sure! If I could find it, I would have flashed the shit out of the TV already.

[Diah]

I already tried to disconnect the ribbon cables. With only one from either side connected / disconnected, both on and both off. That doesn't do squat.
Yeah... firmware... sure! If I could find it, I would have flashed the shit out of the TV already.

i am talking on U ribbon which they are at the middle of each side not the LVDS..... now yours MB working and booting complete and pick IP.. need to try now at this stage.. dont histaed

[CapLeaker]

do please as post 106

Naah... nothing on the display.

[Diah]

Naah... nothing on the display.

LOL... you are swimming at opposite my direction..

please read the specs of yours soc T962 for example to know how communicated or try its second boot to have screen on.

rebrand it with other brand LOL you have the tools like this TVs all used the Soc Xiaomi Mi TV 4 Pro 4A 32"/43" (India) / Skyworth G6A / TCL P4

[nomoresonys]

So what's up with this being a new tv but no firmware easily available from the tcl website. Are they the sort of weirdos that want you to contact them personally to get the firmware or sum such?

[nomoresonys]

Towards the bottom they have options, one says get more help-amazon support, boy howdy there's nothing like trying to go thru 2 entities to get one piece of firmware or do you need more? I noticed it's there but not clickable on that screen, lol=nightmare https://support.tcl.com/troubleshoot...arch=156097362

[CapLeaker]

Towards the bottom they have options, one says get more help-amazon support, boy howdy there's nothing like trying to go thru 2 entities to get one piece of firmware or do you need more? I noticed it's there but not clickable on that screen, lol=nightmare https://support.tcl.com/troubleshoot...arch=156097362

I am going to try Diah’s other trick first. I never seen such a poor support on a TV . No wonder Amazon said to put it into the . FireTV my @$$.
So far I cannot proof that the screen is shorted, since I don’t see anything happening on the LVDS. If Dihs other trick doesn’t work I am going to try a new main board and see what that does.

[Diah]

I am going to try Diah’s other trick first.

before you go for debranding , let us try to wake up the Soc GPU, as yours set working now 100% but with out GPU output.
use external source HDMI with yours TV HIDMI input with function ARC , play movie how long you can..... beside it also put several JPG Photos with 1080P resolution on USB root and insert it in USB Port same time... the idea to make the Soc crazy with sources which it need GPU. this could help to repair its self and switched it on.

other things as you want to test the panel... show here please the clear high resolution photo of the panel edge boards specially to the area of 2 LVDS sockets

[Diah]

we found it... Amlogic Soc called T800 platform or Just T

go to XDA and dounload as zip to put it on root usb stick and use the method of the power key as i explained before for example V127

[Diah]

at yours case need firmware as ,img format not zip.. so it will be downgrade if the version you found less than the one now on the set.
write there at xda,,, it was there .img but no more to download... the threat owner look he is from asia and have access to TCL easy to give you one after you upload there the SW label of yours MB

[CapLeaker]

at yours case need firmware as ,img format not zip.. so it will be downgrade if the version you found less than the one now on the set.
write there at xda,,, it was there .img but no more to download... the threat owner look he is from asia and have access to TCL easy to give you one after you upload there the SW label of yours MB

The only label on the main board is on my post 66

[Diah]

The only label on the main board is on my post 66

its T800