I know this topic has been covered multiple times, but was hoping to get some additional insight from the HW gurus around here.
Symptom: Console that produces the steady beep and no video on power up.
So far, I have desoldered, removed, and tested the following chips on my known good test motherboard:
1) VDP - Good
2) 9901 - Good
3) 9900 - Good
4) Groms - Good
5) Sound Chip - Good
6) 2532 ROMS 1, 2 - Good
7) 8K 1, 2 - Good
8) Signal Generator - Good
9) Crystal - Good
So I've pulled out and validated all the main chips that normally are the culprits that cause the issue. Now, I'm looking for what's next. Is there a critical buffer or other logic chip that I should test? I'm planning on re-watching a few YouTube videos out there that can help me use my scope to figure out where the issue is, but the two or three videos I know of found a bad ROM or RAM chips and those are known good on my board.
Any thoughts on next steps?