Electronics > Repair
Trying to troubleshoot a main board with Rockchip RK3288 microprocessor
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coromonadalix:

--- Quote from: rsjsouza on February 15, 2020, 01:18:06 pm ---
--- Quote from: Haenk on February 15, 2020, 01:04:50 pm ---
--- Quote from: rsjsouza on February 15, 2020, 11:29:01 am ---In this case, I would try to find three pins that would correspond to a UART port (maybe marked on the silk as TX, RX and GND) and connect a serial cable to a terminal program on a computer, configuring it to 115200 baud, 8 bits, no parity, 1 stop bit and no handshake (these are the most common settings for such ports in the marketplace).

--- End quote ---

There *is* a debug port, even noted as such and Comes with a header - even though it has four pins, that might be the way to go, probably just one pin not connected...

--- End quote ---


And the 5 pins white connector near the 4 pins header ??
Yeah, I just saw that on the photograph. Although four pins could also be JTAG (TCK, TDI, TDO, TMS, with GND being somewhere else). Check the connections with a continuity tester.

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Could be an serial or jtag port, as written  check for a ground pin and an 5v or 3.3vdc  pin .... and do a continuity check to the voltages regulators  once you find the main ones ...

And the 5 pins white header near the 4 pins  ??? what does it do ?
Haenk:

--- Quote from: coromonadalix on February 15, 2020, 03:26:10 pm ---And the 5 pins white header near the 4 pins  ??? what does it do ?

--- End quote ---

My guesstimate is "USB header" - a better picture would help (it's stated on the PCB, but only "SB" is readable).
fzabkar:
LDO = low dropout, used to describe a linear regulator which can work in environments where there is a low differential between input and output.
Yamin:
Wow, thanks so much guys! Its getting very exciting. I shall take a picture first thing in the morning when I get into the shop and upload it here.

Yamin:
Here are some close up photos of the connectors.
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