LG OLED55A1PUA
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Who is the maker of these tutorials? If he is the manufacturer then is not a valid source.. today SM are not the bible..! Another LG OLED in a forum is been saved by replacing tcon.. bad tcon is not=TV demolited... -
I see you guys turning every discussion about OLED TVs in rocket science.
Here is ELI5 tutorial.
LG OLED
Unplug LVDS cables between main and Tcon, set turns on? Have a sound? If yes then Tcon/panel bad. Trash it.
You can play around by shortening Tcon sys_pow_off pin #40 on LVDS 51 pin connector on main board side.
That will force main to turn on and you would have all voltages present on Main board and Tcon as well. Your panel might lit up with lines or blotches.
You can also unplug 4 wide ribbons between Tcon and panel and check voltages or scope driver waveforms if you have high end oscilloscope and know what is to be seen on VBY1 lines.
Sony OLED
If you can't get set to turn on, in 90% of the time you would have bad Main board. Rest of 10% would be PS module.
If you unplug LVDS cables TV will go into shutdown with 4 or 5 red blinks, and UNLIKE LG, YOU WILL NOT HAVE ALL VOLTAGES PRESENT!
Also, bad panel would give you 4 or 5 red blinks.
No blinks, present 3.3V Stby and 12V run, 1.8V and 3.3V on EMMC, bad Main.Leave a comment:
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I guess it has the same LG brand Screen, and same problems.. my guess is the same as ever with LG displays.. bad solder.. needs solderings back to youth.. are you able? have you asked the spending threshold? Preparing for a repl. TCON.. and maybe pairing+recalibration costs / headhaches?? And if is main board? Sony famous for bad software, all withing EMMC..!! If i would be you i think better before handling a 77 monster..Leave a comment:
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I guess it has the same LG brand Screen, and same problems.. my guess is the same as ever with LG displays.. bad solder.. needs solderings back to youth.. are you able? have you asked the spending threshold? Preparing for a repl. TCON.. and maybe pairing+recalibration costs / headhaches?? And if is main board? Sony famous for bad software, all withing EMMC..!! If i would be you i think better before handling a 77 monster..Last edited by Davi.p; 01-25-2024, 01:53 AM.Leave a comment:
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I just got another OLED, didn't want to take it but they asked if I could 'at least look at it.' Will start a new post for that tv which is a SONY BRAVIA OLED XR-77A80JLeave a comment:
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ok, thanks for all the help. I tried to power on & all I got was a relay click. I tried using both the service remote and the button on the TV. The LED blinked momentarily but nothing came up and now no longer get the chime either. Giving set back to customer, my guess is panel went bad.Leave a comment:
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BTW: at this test after disconnection the 24V socket and its turn on and optic lit red...... mean yours T-CON fine,,Leave a comment:
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maybe yours service remote send IN_STOP complete command ( mean no need to 0413 ) any way.. if its went to stand by after the command,,,, leave it discharge connect the socket back and try keep your eyes on the screenLast edited by Diah; 01-24-2024, 01:04 PM.Leave a comment:
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ok, Heard relay click when I pressed '0' and agin when I pressed '3'. LED remained on. What should I expect after hearing the relay click? Should I reconnect cable & try to power on?Leave a comment:
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with yours replacement Main boards... every things plugged in... only the 24V socket disconnect from T-con side.... plug it in wall... if it turn on and the optic lit red... send IN_STOP followed with 0413 with service RC. it will turn off to STBY state.. this will resetl rest this chip and the main one on MBLeave a comment:
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with yours replacement Main boards... every things plugged in... only the 24V socket disconnect from T-con side.... plug it in wall... if it turn on and the optic lit red... send IN_STOP followed with 0413 with service RC. it will turn off to STBY state.. this will resetl rest this chip and the main one on MBLeave a comment:
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why don't you start with the easyest things? Reflowing the ram chips / emmc..Leave a comment:
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Repair-it, can you tell me the marking of the emmc? My supposition is that oled screen stores a vcom value for each subpixel, that means for a supposing 12bit data needs at least 37mB, the most large spi i usually see is the 128mbit that holds only 25mb, and plus needs to store the complex fpga programming.. since the main chip is a SoC+fpga and not only fpga like lcd, i guess it stores also a dedicated linux operating system, in.fact there is also uart port for debugging.. the oled tcon are much different from lcd ones as it seems, every one can notice the presence also of huge ram, when in lcd is totally absent, ram means software presence...it maybe integrates also frc function.. the pixels voltages are similar, same vdd, hvdd, vgh, vglLast edited by Davi.p; 01-23-2024, 10:09 PM.Leave a comment:
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just let the T-CON driver boards and the OLED module connected nothings ells with them, fed them with 12- 24V and you will see the screen if it faultLeave a comment:
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