Hello there,
I've had my TI kb for many years now, never had any issues with it. Today I turned it on, and the LCD lights up but nothing shows on it. Nada, zilch. Sound works but has some slight hissy/bleepy noise in the background.
Since it's long out of warranty I took a look at the mainboard (which has a few bodge wires and components hand-soldered on it), and measured whether the LCD is broken. Nope, no data going to the LCD. In fact, the negative supply voltage on Pin 3 of the LCD should be -4V according to the datasheet, but it's +3V.
Took a few snapshots with the thermal imager, the two LM2575S and the two large inductors between them get really hot, so hot that you're actually burning your finger. I noticed that there are some large copper pads and vias for thermal transfer around the LMs, so my question is... is it normal for them to get searing hot? Do you guys (or support) have any experience with problems like this, and is there a common fault that usually develops after some time?