Texas Instruments TI-99/4 Fixed
Texas Instruments TI-99/4 Fixed
Defect:
- Garbage screen on startup immediatly or after a couple of minutes.
Fix:
- This defect is very similar to the one of the Coleco Vision console.
The problem are the pins oxidized of the power switch, i have sprayed R-11 and the problem it’s disappeared completely.
I left turned on the computer for more than 2 hours and i have made a 50 x power cycle (ON/OFF) and the problem is no longer appeared.
Note:
I thought there had to be a VDP RAM problem with a diagnosis made remotely without having the TI-99/4 in the laboratory.
To avoid using the lame RF modulator i have used a standard Commodore 64 composite cable that works very well with a NTSC composite video output.
Gallery:
Categories: Projects / Repairs, Today, Various
Hi
I have the same problem, the Texas Instruments 99/4 have no Picture and whistling sound when switched on.
I have 2 more 99/4 that don’t work
mean you the contacts on the on / off switch on the Console spray with R11 ?
I have 2 more 99/4 that don’t work, maybe I could send them to You ?
greetings
Bernhard from Germany