i have a problem where no touch is registered at all by the chip . i dont think its a problem with how i soldered it since its been malfunctionnning on multiple different boards. reistance is good on the x+ and x- pins at aroudn 300ohms and voltage is going to display. i linked the schematic, please help. im using esp32 and TSC2046IPWR.here is my touchscreen link ILI9488 full view angle 3.5 Inch IPS Touch Best Sale LCD 40pin 320*480 high quality - AliExpress 44
Greetings,
Unpacking these statements/observations a bit should give you a number of leads to follow:
- What chip?
- What exactly does “register” mean in this context?
- What specifically is meant by this?
- What “board” is spoken of?
- Is an expected result achieved in some instances but not in others? If so, what are the differences between those that appear functional and those that are not?
- Or is there consistent failure to achieve an expected result across all sampled instances? Such a pattern would suggest a systemic issue or mis-application of some type. If using a self-designed circuit board for example, forgetting to route a necessary trace would produce a consistent failure to function. In this case, follow the signal path (starting with a touch input) and measure the resulting signal at each subsequent point in the chain. The point at which an input stops yielding an expected result should provide clues as to what’s amiss.
- What precisely is meant by this?
- What role do such things play in the process of converting a touch input into whatever output is is that you’re looking for? What else is necessary to the process, and are those conditions met?
It would appear that the touchscreen in question is a resistive type; familiarizing oneself with the operating theory of the device one’s trying to troubleshoot is always helpful. For such purposes I recommend manufacturers’ application notes, such as that found here.