help debrick cloudnetgo cr13

[anteros]

help debrick cloudnetgo cr13,htc-t033.

When I plug the power,the light is red,after pressing the power button,normally it'll be blue,but now it's no light,the screen is dark.

Tried hold reset when plug usb to the OTG usb port,android 2.3.5,computer didn't recognize the box as before.

Can someone tell me where to short the NAND,the brand is Foresee,is it where the arrow is the dot 1?

Where is the ttl hole so that I can hook up a usb-ttl to check what really happened?

many thanks.

[freddy]

Observations from images

Unsure about Nand

First image upper right below USB ports

Vcc

DM

DP

GND

Data minus /data plus

DM /DP are like TX / RX

Maybe try serial there

DM= RX

DP= TX

This is old board 2014 on /in image

There are many test points on left side of Board

Good Luck

Happy testing

[anteros]

Observations from images

Unsure about Nand

First image upper right below USB ports

Vcc

DM

DP

GND

Data minus /data plus

DM /DP are like TX / RX

Maybe try serial there

DM= RX

DP= TX

This is old board 2014 on /in image

There are many test points on left side of Board

Good Luck

Happy testing

Hi,

Thanks for your tips.

Just like the one for this tablet,he did it successfully,short pin 8&9,nothing,also tried 6&7,7&8 and the pins on the right side to no avail.

other pins tried also

I just want to hook up a USB-ttl cable to see the bootlog,but can't seem to find them.Only find the USB GND DM DC 5V.

left side of Board are for more interface like apprently the first lot is for VGA socket,not test points at all.

The place I assume would be three places,one is the USB port DM DP,I dought that,and there are other two places with three holes I suspect would be TX TR GND,


Maybe hardware error?The PMU is Active 8846qm,it's hot,I heard it's normal to be 65 dedrees celcius?
I got a multimeter,how to check?

Any ideas?

[freddy]

Yes

On USB/ TTL adapter move jumper From 3.3 V
To
5 V
And test DM DP as posted above for serial

More observations from images RE: possible serial

To the left of Nand almost parralel are 4 concentric

To the left of Nand and up 2 ,3 cm are 3 concentric

To the Right of Nand directly below Blue Sticker are 4 concentric (looks promising/Note the # 2 or Letter Z in black marker written on Board)

In OP image 1 you will see the SAme contacts/points and the # 2 or Z in marker on Board....

Could be Something

Now should leave Jumper at 5 V ????

Or Back to 3.3 V is the ?????

May have to try Both

Good Luck

Happy Testing