Electronics > Microcontrollers

TV Mainboard EEPROM Hacking Plasma/Oled

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DIYFreak811:
Hi all.
I have something for you which is certainly out of ordinary even on this forum but it should be piece of cake for some people here. :popcorn: hopefully lol
I need help with accessing main eeprom on TV mainboards-full read and write access. Layout is very similar on these mainboards whether it's plasma,oled or even led.
Some of these boards are for 10+year old TVs,that can't be hard let alone impossible right?
OK,the first I'm interested in it's for over 10 year old TV-plasma. There should be about 3-5 ROMs and there's also service conector. Write protection is there 100%.
How to access them without desoldering? I can post more pictures if necessary and give some more info.

DIYFreak811:
OK guys,show me what you got lol  There's no way some of you can't hack this.  :box:
I'll help as much as I can. I have Arduino Uno,dunno if it's enough. Solution without desoldering preferred.

jnk0le:
so8 in bottom right could be the flash memory (25qXX), can be accessed with special clips like the ones usually sold with ch341 programmers.

There could be also nand/emmc uder those heatsinks.

pcprogrammer:
Better pictures with more detail of what is written on the IC's can lead to better feedback.

Be aware with CH341 programmers that jnk0le referred to. Even though they allow selection of the target supply voltage between 5V and 3.3V the signal levels may remain on 5V and destroy targets when they are 3.3V types.

Also check the board to make sure there is a diode in the FLASH power supply to protect against feeding the whole board when the programmer is connected. If not present then try reading the FLASH with the board powered the normal way and do not connect the supply pin of the FLASH to the programmer. You might have to keep reset of a MCU/CPU low.

Even better would be schematics of the boards. Knowing make and model of the TV's could help in getting these schematics.

So when trying to lure us in with a challenge, it is best to give us as much information as possible, otherwise we just don't bite that easily.  :-DD

DIYFreak811:
OK here are more pictures of the board and screenshot of the service menu with listed ROMs.

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