BV4900 touch screen panel aka digitizer - has arrived to me!
Advantages:
1) Has been created for a rugged IP68 phone and its thick glass feels super reliable
2) Should fit geometrically: horizontally - ideal, vertically - is slightly smaller, but should not be an issue
3) Dirt cheap - just $4 with shipping included, is available worldwide and all the time
4) Technically is compatible with Pinephone, because it indeed has the same Goodix GT917S chip according to the chip/cable markings:
Difficulties:
1) BV4900's touch panel flex cable is located at the bottom, while Pinephone's is located at the top - so I need to craft some extension cable, thin enough to fit into the phone, probably FPC-based
2) These touch panels have different pinouts and connectors; according to the flex cable markings that luckily tell us the pinouts:
So, if I don't want to solder the directly to the flex cables, then I also need to somewhere get two FPC connectors of these different pitches and create a thin enough adapter that will function as an extension cable (from a bottom to top) and also changes the pinout. Definitely possible, but slightly time consuming
3) Carefully separate the Pinephone's touch panel from LCD without breaking it - unfortunately it turned out that a glue between touchscreen and LCD is much stronger than a glue between the LCD and its metal backplate and I ended up warping the whole thing while separating by slowly pulling a string between them
(or maybe I didn't heat it enough, the max I used was 150 C) . Now, I need to find a screen with ST7703 controller and preferably the same pinout
Advantages:
1) Has been created for a rugged IP68 phone and its thick glass feels super reliable
2) Should fit geometrically: horizontally - ideal, vertically - is slightly smaller, but should not be an issue
3) Dirt cheap - just $4 with shipping included, is available worldwide and all the time
4) Technically is compatible with Pinephone, because it indeed has the same Goodix GT917S chip according to the chip/cable markings:
Code:
GOODIX
GT917S
1950-T052
172M20
AP2A2S8P01
20-03-24 FSC
225-FPCV1-917S1) BV4900's touch panel flex cable is located at the bottom, while Pinephone's is located at the top - so I need to craft some extension cable, thin enough to fit into the phone, probably FPC-based
2) These touch panels have different pinouts and connectors; according to the flex cable markings that luckily tell us the pinouts:
Code:
BV4900 - 0.8mm pitch 6-pin FPC connector:
1. SCL
2. SDA
3. RST
4. INT
5. VDD
6. GNDCode:
Pinephone: 0.5mm pitch 6-pin FPC connector
1. GND
2. SDA
3. SCL
4. VDD
5. INT
6. RST3) Carefully separate the Pinephone's touch panel from LCD without breaking it - unfortunately it turned out that a glue between touchscreen and LCD is much stronger than a glue between the LCD and its metal backplate and I ended up warping the whole thing while separating by slowly pulling a string between them
(or maybe I didn't heat it enough, the max I used was 150 C) . Now, I need to find a screen with ST7703 controller and preferably the same pinout
