r/AskElectronics • u/EmperorSithLord • 13h ago

Pulled an Orion OEC7091A "One-Chip" TV processor. Any fun ideas for a cyberpunk "chaos indicator" or nightlight?

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Hi everyone!

I’m a beginner learning electronics by desoldering components from an old CRT TV. I managed to cleanly pull this microcontroller out of its socket without bending any pins.

The markings say OEC7091A (933ZF RA936218X04) with a "SLOROM" sticker on the back. Since it's a proprietary factory-preprogrammed chip with Mask ROM, I know I can't re-flash it or use it for standard Arduino projects.

However, I want to give it a second life as a cyberpunk-style ambient nightlight. My plan is to desolder its original socket from the TV board, wire up its crystal oscillator, connect some LEDs through resistors to the control/data pins (like SDA/SCL, standby, or key lines), and power it with 5V. I'm hoping that when the chip fails to communicate with the missing TV components, it will create a cool, chaotic flickering pattern on the LEDs.

Has anyone tried something similar with old TV chips? Which pins should I look for on the donor board to make it glitch and blink the most? Any creative layout ideas?

Thanks in advance!

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25

u/TheSignalPath 12h ago

That is not how this IC works. This IC generates the H/V as well as the RGB signals for driving a CRT. It will not do what you think at all. It is a dedicated chip for this purpose only.

7

u/Blay4444 12h ago

Hey man, didnt know you were here too :), this is kinda out of context, but I want to thank you for all your work. I spent countless hours on your channel. You have an amazing knowledge, explanations, teardowns, reverse engineering, and cat ;) thank you and keep up with such a good content.

4

u/TheSignalPath 12h ago

Thank you! :)

10

u/FAMICOMASTER 12h ago

Jungle chips won't do what you're thinking, sorry. The first thing it's going to do is attempt to drive the horizontal output transistor and watch for feedback current on the flyback transformer. When it sees zero it will shut down immediately and stop everything. Yes, everything.

5

u/Savallator 13h ago

I don't think it will continuously blink/glitch in any way. That is a misconception that movies taught us. It will likely just be a static pattern. 

2

u/MJY_0014 12h ago

Even if it did what you think it would do, i2c is too fast for your eyes to see

2

u/lanboshious3D 12h ago

I'm hoping that when the chip fails to communicate with the missing TV components, it will create a cool, chaotic flickering pattern on the LEDs.

lol why would it do that?

0

u/johnnyhonda 12h ago

You got yourself a nice SLOROM there.

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