Samsung UE46B6000 exlink uart problem

[Davi.p]

Hi, i'm wondering why when i connect this TV mainboard to an external 5v+ 12v p. supply and a pairnof programmers to access the debug Uart Exlink with minijack audio-style, i get strange seriesnof characters, i have tried to change almost all connection parameters but them aren't surey the problem, the supply lines signs slightly low voltages, about 0,5v less, is this why i'm having troubles?

[CapLeaker]

Re: Samsung UE46B6000 exlink uart problem

if you get weird characters on the screen using a ttl on the uart port, it sounds like speed, stop bit parameters aren't set correctly.

[Davi.p]

Re: Samsung UE46B6000 exlink uart problem

Solved the mistery, on the board there is a MP232EC that is a marking for a MAX3232 that is a 3v<>5/12v level shifter, so i was using the CH341A programmer with 3V serial, instead using it directly on the TTL 232 of my PC the LOG is all there!

[CapLeaker]

Re: Samsung UE46B6000 exlink uart problem

so it was serial not ttl. that would do it.

[Davi.p]

Re: Samsung UE46B6000 exlink uart problem

Sorry standard rs232 (cmos levels?)

[CapLeaker]

Re: Samsung UE46B6000 exlink uart problem

rs232 = serial = 10V (see max232)
TTL = 5V, 3.3V or 1.8V

[budm]

Re: Samsung UE46B6000 exlink uart problem

RS232: https://www.maximintegrated.com/en/d...ials/8/83.html

[Davi.p]

Re: Samsung UE46B6000 exlink uart problem

OK let's say TV serial=TTL level (not this model), PC serial=RS232 standard.