BV6000 Proximity Sensor - fix
Posted: Tue Dec 27, 2016 11:30 am
Many of BV6000 users on 4PDA and other forums are complaining about issues that phone does not dim screen while making a calls. I have made an analysis and I would like to share result and working solution with you.
Video comparing working BV6000 and broken BV6000 proximity sensors:
https://www.youtube.com/watch?v=s8NYcs-Yo5E
Go to service mode *#9646633* and select
Hardware-->Sensor-->Light/Priximity Sensor-->PS Calibration
If your BV6000 acts like the right yellow model, then you are affected with this issue.
Root cause:
Proximity sensor is good. Rubber part covering sensor is really poor quality and it has a gap just above sensor causing light leaks.
PS reading 0-80 are considered as "far". Phone cannot get proximity readings >100 which are considered as "near", so the phone does not dim the screen at all. This is causing a lot of unwanted touch screens while making a call. If the proximity readings were possible in full range 0-255, then the threshold settings 40-100 would be perfect. This issue cannot be fixed by any calibration.
On my working, green BV6000, this rubber part has a bit different shape and it is made with much softer rubber. The edge which is covering sensor is also much tighter than on the yellow one.
Workaround:
Disassemble the phone, like on video here:
https://www.youtube.com/watch?v=9yLEemeXFnY
You do not need to disassemble the whole phone. Just get to the part, when you can detach main board.
Then turn upside down this rubber part covering proximity sensor. It is not meant to be mounted this way, but it will fit. Basically the part which was close to the screen should go close to sensor. This will make gap between rubber and PS sensor smaller and there will be just tiny light leak. It will not make full proximity range 0-255, but it will improve a lot.
On my phone proximity range expanded from 0-80 to 0-200 after this mod. Phone will dim the screen while making a call, if you head is 1cm above sensor. On working phone 0-255 it dims screen in 2-3cm range.
The only 100% solution:
New working rubber part to be sent to all affected users.
Blackview, can you send me this part?
Video comparing working BV6000 and broken BV6000 proximity sensors:
https://www.youtube.com/watch?v=s8NYcs-Yo5E
Go to service mode *#9646633* and select
Hardware-->Sensor-->Light/Priximity Sensor-->PS Calibration
If your BV6000 acts like the right yellow model, then you are affected with this issue.
Root cause:
Proximity sensor is good. Rubber part covering sensor is really poor quality and it has a gap just above sensor causing light leaks.
PS reading 0-80 are considered as "far". Phone cannot get proximity readings >100 which are considered as "near", so the phone does not dim the screen at all. This is causing a lot of unwanted touch screens while making a call. If the proximity readings were possible in full range 0-255, then the threshold settings 40-100 would be perfect. This issue cannot be fixed by any calibration.
On my working, green BV6000, this rubber part has a bit different shape and it is made with much softer rubber. The edge which is covering sensor is also much tighter than on the yellow one.
Workaround:
Disassemble the phone, like on video here:
https://www.youtube.com/watch?v=9yLEemeXFnY
You do not need to disassemble the whole phone. Just get to the part, when you can detach main board.
Then turn upside down this rubber part covering proximity sensor. It is not meant to be mounted this way, but it will fit. Basically the part which was close to the screen should go close to sensor. This will make gap between rubber and PS sensor smaller and there will be just tiny light leak. It will not make full proximity range 0-255, but it will improve a lot.
On my phone proximity range expanded from 0-80 to 0-200 after this mod. Phone will dim the screen while making a call, if you head is 1cm above sensor. On working phone 0-255 it dims screen in 2-3cm range.
The only 100% solution:
New working rubber part to be sent to all affected users.
Blackview, can you send me this part?