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[Hi8 Pro] Flashing BIOS - lost connection

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oeriel|Post time:3 day(s) ago View:52|Reply:1

Edited by oeriel at 2-14-2018 15:28

Hi,

I have CHUWI Hi8 Pro. Tablet switches off and seems like dead. When I connect power it seems like it takes power about 0,45A, but no reaction on power switch etc.
No charging diode, no reaction at all. I decided to flash a BIOS. I have flashed BIOS in many devices. Almost all was ok. Same was with my CHUWI Hi10, after flashing it resurrect.
But when I'm connecting programmer to BIOS chip it lost connection. LED dims after powering. In programmer "Detect" button dissapears when connected to USB port. All pins on chip are connected properly. Programmer is through adapter 1,8V.
So I decided to unsolder chip. When it was unsoldered programmer see it normally. No problems. Chip was quite "not usable" so I've take new one and flashed it with same BIOS.

All ok. And then I solder it to mainboard and the same. When connecting programmer it's LED dims and cannot Detect it.
Tablet also, not powering on, no reaction and taking power ~ 0,45A.

To sum up:
Tried connect programmer in different USB ports (also 2.0 and 3.0).
Tried flash from different devices (computers).
BIOS are readable when desoldered from mainboard.
When connecting programmer, it's RED LED powers on and dims.
In programmer App "Detect" button appear for a second and dissappear. It's like there is conflict and it disables.

Below is video how it looks. "Clicks" on video is a switch to USB button on/off.
Link: https://www.youtube.com/watch?v=oOMpLROVgV0


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thaayb| Post time 3 day(s) ago From the mobile phone | Show all posts
Edited by thaayb at 2-15-2018 10:58

From what I could see on the video, the clip was connected wrong to the 1,8 Volt adapter. Pin number 1 should be the red cable. But the red cable ist connected to pin 8 on the small pcb thats sticked to the 1.8V adapter. I may be wrong.
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