ti 99 4a issue

[ti 99 4a issue]

I will clean the grease off good ideo

 

yano i couldnt find chips with TMS4116 written on them in the computer

 

And Arcadeshopper, Thats such a great trouble shooting trick! Ide deffinitly change all 8. What kind of kajigging? Ide like to so it all simple and factory

 

My intentions are to restore and store the computer. Try some games and put it on a shelf and love it forever. Minimal use

 

So whats the exact chips i need? I have Zero help in this city finding computer parts

[ti 99 4a issue]

 

All appart

[ti 99 4a issue]

Jees thats some great info. Just what i was looking for. Although iam nearly incapable of completely understanding.

 

After work ill take it apart, then photos of the inside and we will highlight some solders to go over with the iron. I seen some wires that looks out of place ill highlight those too

[ti 99 4a issue]

I lifted and lowered all the chips i could, which chip is grom?

[ti 99 4a issue]

Thanks for the help By the way!

[ti 99 4a issue]

The white feilds are grey fuzzy upclose

 

No flash, 3480x2160 HD The latest picture is as true as a picture of a tv can be

 

This is a bit difficult to find out. I tried to apply some stuck-at-0 and stuck-at-1 masks in the MAME emulation of the video processor RAM, but I could not reproduce this pattern. Are the bright fields more like gray or more like white? Did you use a flash? (have to turn it off)

[ti 99 4a issue]

If i was working on a car ide re melt all the solder point. Could the computer get cracked solder points from rough handling?

[ti 99 4a issue]

I turned it back on to make sure the camera got the colors right. it did.

[ti 99 4a issue]

Good link found my issue. Number 3 vram chip is toast i guess? i think anyway

 

chip TMS4116

 

https://m.ebay.ca/itm/10pcs-TMS4116-15NL-TMS4116-IC-Chip-DIP-16/253164284180?hash=item3af1c46914:g:EqwAAOSwhYdZwh7l

[ti 99 4a issue]

It looks like some defective VDP RAM chips.

Damn. Are they the small removable chips i found lined up inside?

 

Btw its an american (canada) machine

[ti 99 4a issue]

Thanks ollopa

 

I posted a video to youtube, in it i turn it on and press some random keys

 

And heres my cord i made

[ti 99 4a issue]

Hey guys i just recently started picking up electronics since i baught a house in the city, now i have thrift stores and space haha

 

Anyway i got a ti 994a today. Its my first pc older than windows 95. It was 30$

 

I played with the rf modulator and figured i could wire rca style plugs to the cable, i used 25 foot subwoofer stereo cables to reach my flatscreen

 

It seams i have video and can hear beeps when i press keys, but i all i get is the color strips at the title screen, then i press a key and the color bars dissapear. No text like i see on youtube videos

 

Any ideas? Ide appreciate some, Thank you!