aBUGSworstnightmare
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Re: Nexus 7 LCDs

Fri Oct 14, 2016 7:29 pm

... and nearly there ..
WP_20161014_21_20_41_Smart.jpg
WP_20161014_21_20_41_Smart.jpg (33.81 KiB) Viewed 6258 times
Some minor timing adjustments were needed since displayed image is too small (front or back porch needs to be modified ...)
Protection film is still attached, that's why it looks somehow 'strange' (you can see some air bubbles under the protection film)

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saper_2
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Re: Nexus 7 LCDs

Fri Oct 14, 2016 10:15 pm

aBUGSworstnightmare wrote: You need to distinguish between single pixel and double pixel LVDS interface (some refer to them as single - or double channel) and colour depth (6- or 8-bit).
I've noticed that there are Odd and Even pairs (pins) in LVDS connector in some DVI->LVDS boards. I've took a quick look on mentioned page, and there were some explanations.
aBUGSworstnightmare wrote: Let's take the Nexus 7 as an example. Colour depth on the Gen1 display (the one that I have on hands) is 6-bit, that's why it has 3 differential signal pairs for data Y0 to Y2 (Y0 is the upper channel in the mapping charts and Y3 is the lower one).
Single- or dual pixel is (let's say most of the time, there are exceptions to this as well) related with the displays resolution: single pixel (channel) LVDS is possible up to HD (1366x768) pixel.
In addition to this it needs you need to have a differential signal pair for the clock signal.
I know, clock is one pair, that leave 5 pairs for data, I'm not really sure to think that there is 2 more pairs on those 4 wires in question, they are not in layout that suggest they can carry high frequency differential signals. Those tracks are right beside a power track (what else it can be - thick track that connect 2 pins in both connectors). Also there must be at least one track for backlight control - that's would leave 3 tracks....
aBUGSworstnightmare wrote: Total price for the PCB is roughly USD40 with transportation cost being higher than actual PCB cost (USD12). They are HAL only: no need to spend anther USD26 for ENIG (since I'm just using them as proof-of-concept samples).
That's expensive...
aBUGSworstnightmare wrote: To me this looks like 8 differential signal pairs! The display is FHD resolution so it needs to be dual channel LVDS (odd and even channel) --> you will have 3 data channels and one clock channel for odd and even LVDS channel. This results in 8 differential signal pairs, but colour depth is 6bit only for this connection. Will be hard to tell what goes to where without having the displays data sheet...
Yeah, I know, as I've been looking at that web page most FHD (1920x1080/1200) panels had 8-pairs. While up to HDRedy (1366x768) had only 4 pairs (3+1). I'm really starting to think that the Nexus 7 2013 (gen2) LCD have 4-lane MIPI-DSI interface... Well, that is a killer :/ for my imagination... ;)
I'll will wait, there might popup in near future somewhere ME571K repair guide/service manual or LCD datasheet for free download (so far I found ME571K for $$$$).
aBUGSworstnightmare wrote: ... build 1st sample ..
0,3mm pitch 8-)
aBUGSworstnightmare wrote: ... and nearly there ..
COOL :ugeek:

Will you public your project (PCB designs, configurations, etc.) ?

I think I'll play for now with Gen1 LCD so I might bother you in future how you did it ;) .
As for Gen2 lcd, There is too much unknowns about it (for now).

--- EDIT ---
I just found out what interface is looking at /sys/class/graphics/fb0/.
The Nexus 7 2013 (aka Gen2) have MIPI-DSI interface. So I just wasted time :/ because it not possible for me to use it.

Code: Select all

[email protected]:/sys/class/graphics/fb0 $ ls
bits_per_pixel
blank
console
cursor
dev
mode
modes
msm_fb_fps_level
msm_fb_type
name
pan
power
rotate
state
stride
subsystem
uevent
virtual_size
vsync_event
[email protected]:/sys/class/graphics/fb0 $ cat msm_fb_type
mipi dsi cmd panel
MIPI DSI - that's explain itself. So now I'm looking at N7 2012 LCDs :D

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Sun Oct 16, 2016 12:12 pm

Here are a few more pictures of the Nexus 7 LVDS adapter board:
WP_20161014_17_58_59_Smart.jpg
Assembled adapter board for use with Nexus 7 Gen 1 display
WP_20161014_17_58_59_Smart.jpg (30.58 KiB) Viewed 6146 times
WP_20161015_14_25_30_Smart.jpg
Uses the standard display cable from the tablet. Masking tape is used on the FPC since there are some open ground connections. Added double-sided mirror tape for fixing the PCB to the back of the display
WP_20161015_14_25_30_Smart.jpg (31.01 KiB) Viewed 6146 times
WP_20161015_14_26_32_Smart.jpg
display adapter in place
WP_20161015_14_26_32_Smart.jpg (37 KiB) Viewed 6146 times
This adapter can be used with the displays from Google Nexus 7 Gen 1 tablet. Two displays from different manufactures were used in the tablet:
CPT CLAA070WP03XG (that's the one I'm testing with)
HYDIS HV070WX2-1E0

I have some of these adapter PCB left which I'm selling at cost (unpopulated PCB is 3EUR, inkl. world-wide shipping). If you're looking for populated PCBs and the LVDS add-on board I'm using for driving it send me a PM.

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saper_2
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Re: Nexus 7 LCDs

Sun Oct 16, 2016 6:21 pm

Hi,

Again, Niceeeeee :) but I think you didn't have to cover the back side (and the pads) of the FPC cable.

Few questions:
1. I'm interested in 1-2 pcs pcb - how you sell them (3€ with shipping - good deal :) )?
2. The lcd from N7 gen1 have LVDS interface "single channel 6bit" - am I right? (yes, you written that N7 gen1 lcd have 6bit color - 3 data pairs)
3. So I can buy a few LVDS cables (with DF14-20P connector) that have 4 or 5 pairs (those Chinese sellers have really strange names for them :? )
4. Can you publish schematic at least? I'm curious about those resistors and JP1 :)
5. Don't know (yet) :D


btw. Do you ad a double-sided adhesive foam Tesa tape? :lol:

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Mon Oct 17, 2016 5:02 am

I'm using this cable - http://www.banggood.com/20Pin-DF14-20-2 ... mds=search - taking additional wires from a second one.
I will prepare a complete set of data (BOM, schematic, description) of the adapter and then publish it.

P.S. You should have a look at Tesa http://www.tesa.com - this is what I've used: http://www.tesa.com/consumer/powerbond/ ... ror,c.html

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saper_2
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Re: Nexus 7 LCDs

Mon Oct 17, 2016 5:50 pm

aBUGSworstnightmare wrote:I'm using this cable - http://www.banggood.com/20Pin-DF14-20-2 ... mds=search - taking additional wires from a second one.
If I see right (low res. photo), you added 2 wires (I think 19 & 20 pin?) - it's additional power?
aBUGSworstnightmare wrote: I will prepare a complete set of data (BOM, schematic, description) of the adapter and then publish it.
Well, schematic tell more than words :D , I'm waiting impatiently :)

aBUGSworstnightmare wrote:P.S. You should have a look at Tesa http: ...
- that was supposed a joke that you "advertise Tesa tape" :)

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Tue Oct 18, 2016 6:09 am

Hi,

schematic and BOM of the adapter PCB are available here https://drive.google.com/drive/folders/ ... sp=sharing

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Fri Oct 21, 2016 5:26 pm

... and here's a demo video
https://youtu.be/960YQle-f2w
Last edited by aBUGSworstnightmare on Sat Oct 22, 2016 9:55 am, edited 1 time in total.

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scruss
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Re: Nexus 7 LCDs

Fri Oct 21, 2016 9:22 pm

oooh, nice work!
‘Remember the Golden Rule of Selling: “Do not resort to violence.”’ — McGlashan.

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saper_2
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Re: Nexus 7 LCDs

Thu Oct 27, 2016 5:13 pm

Hi,

How did you soldered the AXT530124 connector? I think how I solder this...
Well, got two ideas :D :
- use hotair and heat the board from underside to solder the AXT placed on top (first add more tin on pads and use a lot of flux - cleaning will be fast: soft toothbrush and IPA :D )
- sharpen a tip from my iron and solder with a lot of flux, then remove extra tin and shorts with "desoldering wire" - I prefer this method :D


So what about config(s)? Too busy?

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Fri Oct 28, 2016 4:46 am

Sorry, missed the add the config to this thread (only posted it in the LVDS4Pi thread - viewtopic.php?p=1057148#p1057148 , simply because you will need to have a LVDS adapter. I want to start posting all the configes I've used so far in that thread so everything is available from one place). :oops:

Here you go:

Code: Select all

# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details
# for use with Google Nexus 7 Gen1 (2012) display modules
# - CPT CLAA070WP03XG
# - HYDIS HV070WX2-1E0
# by Joerg Quinten, aBUGSworstnightmare

dtoverlay=dpi24
disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=0
#overscan_right=0
#overscan_top=0
#overscan_bottom=0

# set display orientation
display_rotate=3

# uncomment to force a console size. By default it will be display's size minus
# overscan.
framebuffer_width=1280
framebuffer_height=760
# still have to figure out why 1280x800 gives black border left and right (40pixels
# each)

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
gpu_mem=304


# ---------------------------------------------
# Enable DPI
# --------------------------------------------- 
enable_dpi_lcd=1

# ---------------------------------------------
# Make DPI default output
# ---------------------------------------------
display_default_lcd=1

# ---------------------------------------------
# custom HDMI mode
# https://www.raspberrypi.org/forums/viewtopic.php?p=613926#p613926
# https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=24679
# ---------------------------------------------
dpi_group=2
dpi_mode=87

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=off
dtparam=spi=off

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# ---------------------------------------------
# DPI output format definitions
# https://www.raspberrypi.org/forums/viewtopic.php?p=628061#p628061
# DPI structure: https://www.raspberrypi.org/forums/viewtopic.php?p=617719#p617719
# ---------------------------------------------
# output_format:
#   1: DPI_OUTPUT_FORMAT_9BIT_666
#   2: DPI_OUTPUT_FORMAT_16BIT_565_CFG1
#   3: DPI_OUTPUT_FORMAT_16BIT_565_CFG2
#   4: DPI_OUTPUT_FORMAT_16BIT_565_CFG3
#   5: DPI_OUTPUT_FORMAT_18BIT_666_CFG1
#   6: DPI_OUTPUT_FORMAT_18BIT_666_CFG2
#   7: DPI_OUTPUT_FORMAT_24BIT_888
#
# rgb_order:
#   1: DPI_RGB_ORDER_RGB
#   2: DPI_RGB_ORDER_BGR
#   3: DPI_RGB_ORDER_GRB
#   4: DPI_RGB_ORDER_BRG
#
# output_enable_mode:
#   0: DPI_OUTPUT_ENABLE_MODE_DATA_VALID
#   1: DPI_OUTPUT_ENABLE_MODE_COMBINED_SYNCS
#
# invert_pixel_clock:
#   0: RGB Data changes on rising edge and is stable at falling edge
#   1: RGB Data changes on falling edge and is stable at rising edge
#
# hsync polarity: 
#   0: default for HDMI mode
#   1: inverted
#
# vsync polarity:
#   0: default for HDMI mode
#   1: inverted
#
# output_enable_polarity:
#   0: default for HDMI mode
#   1: inverted
#
# hsync phase:
#   0: rising edge
#   1: falling edge
#
# vsync phase:
#   0: rising edge
#   1: falling edge
#
# output_enable phase:
#   0: rising edge
#   1: falling edge
# ---------------------------------------------
dpi_output_format=483351

# ---------------------------------------------
# HDMI timing definitions
#https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=24679
# ---------------------------------------------
# hdmi_timings= <h_active_pixels>
#        LCD module horizontal resolution
#
#               <h_sync_polarity>
#         0: active low
#        1: active high
#
#               <h_front_porch> 
#      <h_sync_pulse>
#      <h_back_porch>
#      <v_active_lines>
#        LCD module vertical resolution
#
#      <v_sync_polarity>
#         0: active low
#        1: active high
#
#      <v_front_porch>
#      <v_sync_pulse>
#      <v_back_porch>
#
#      <v_sync_offset_a>
#      <v_sync_offset_b>
#      <pixel_rep>
#
#      <frame_rate>
#        screen refrech rate (50/60Hz supported only!)#
#
#      <interlaced>
#
#      <pixel_freq>
#        calculates as: <h_active_pixels> * <v_active_lines> * <frame_rate>
#
#      <aspect_ratio>
#        HDMI_ASPECT_4_3 = 1
#        HDMI_ASPECT_14_9 = 2
#        HDMI_ASPECT_16_9 = 3
#        HDMI_ASPECT_5_4 = 4
#        HDMI_ASPECT_16_10 = 5
#        HDMI_ASPECT_15_9 = 6
#        HDMI_ASPECT_21_9 = 7
#        HDMI_ASPECT_64_27 = 8
# ---------------------------------------------
hdmi_timings=800 0 16 16 64 1280 0 5 1 2 0 0 0 60 0 66800000 5
The display is 6-bit LVDS and has the data mapping shown below
6bitlvds.jpg
Nexus 7 Gen1 (2012) - LVDS data mapping
6bitlvds.jpg (30.47 KiB) Viewed 5609 times
As mentioned here viewtopic.php?f=29&t=162927 , I can only achieve 1200x760pixel resolution for desktop use. I still need to work on the timing, but there is one thing the data sheet that makes me slightly concerned: vertical active time is specified with 1200!
CPTtiming.jpg
CPT display timing: vertical active is specified as 1200
CPTtiming.jpg (28.24 KiB) Viewed 5609 times
Compare this to HYDIS
Hydistiming.jpg
HYDIS timing - vertical active is specified with 1280
Hydistiming.jpg (55.26 KiB) Viewed 5609 times
That's why I want to get a HYDIS as well to make a side be side comparison test.
Last edited by aBUGSworstnightmare on Fri Oct 28, 2016 5:10 am, edited 1 time in total.

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Fri Oct 28, 2016 5:05 am

Soldering the connector for the LVDS cable was simpler than expected!

1. Be sure to use a magnifier lens (I have a 2.25x magnifier lamp - 5 dioptre - at my desk - http://www.elv.de/elv-6-w-led-lupenleuc ... -leds.html) or microscope - I'm using this http://www.bresser.de/en/Microscopes-Ma ... scope.html , also for soldering and inspection
2.) use the smallest tip you can get! Checked my the solder tip I've used - it's 0.4mm needle. But I'm currently building a DIY Weller WSM1 clone for using Weller RT1 (active) soldering tips (http://www.weller-toolsus.com/weller-t0 ... -2-mm.html). Search the web for the instructions - also in here https://shop.heise.de/katalog/make-5-2016
3.) use flux - I'm using this one http://www.chipquik.com/store/product_i ... _id=310006
4.) use small solder wire - I'm using i.e. this one http://de.rs-online.com/web/p/lote/3612050/ - it's 0.23mm
5.) be patient!
bot.jpg
bot.jpg (58.61 KiB) Viewed 5565 times
I've soldered the connector very carefully, so NO excessive solder had to be removed. Keep the stacking height in mind - it's only 1mm --> if you have added too much solder your plug will not fit

haiqu
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Re: Nexus 7 LCDs

Fri Nov 04, 2016 2:34 pm

aBUGSworstnightmare wrote: I have some of these adapter PCB left which I'm selling at cost (unpopulated PCB is 3EUR, inkl. world-wide shipping). If you're looking for populated PCBs and the LVDS add-on board I'm using for driving it send me a PM.
Sorry, newly registered and can't send a PM. I'd be interested in a populated board and links to the LVDS board and cable used. Paypal or Bitcoin, shipping to Brisbane Australia.

Price?

zsszucsi
Posts: 1
Joined: Tue Nov 15, 2016 8:45 am

Re: Nexus 7 LCDs

Tue Nov 15, 2016 8:54 am

aBUGSworstnightmare wrote: I have some of these adapter PCB left which I'm selling at cost (unpopulated PCB is 3EUR, inkl. world-wide shipping). If you're looking for populated PCBs and the LVDS add-on board I'm using for driving it send me a PM.
Hi aBUGSworstnightmare,
That's amazing what you made! I have a dead Nexus Gen1 and this is really cool to re-use its display with my RPi B. I registered here just to reply to you, but can't send a PM yet. Could you please let me know how can I buy a populated PCB from your stock?
Thanks,
Zsolt

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Tue Nov 15, 2016 2:46 pm

zsszucsi wrote:
aBUGSworstnightmare wrote: I have some of these adapter PCB left which I'm selling at cost (unpopulated PCB is 3EUR, inkl. world-wide shipping). If you're looking for populated PCBs and the LVDS add-on board I'm using for driving it send me a PM.
Hi aBUGSworstnightmare,
That's amazing what you made! I have a dead Nexus Gen1 and this is really cool to re-use its display with my RPi B. I registered here just to reply to you, but can't send a PM yet. Could you please let me know how can I buy a populated PCB from your stock?
Thanks,
Zsolt
Glad you like it. But, be sure to read this as well viewtopic.php?p=1064596#p1064596!

brad.walker
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Joined: Fri Dec 23, 2016 10:29 pm

Re: Nexus 7 LCDs

Wed Dec 28, 2016 11:21 pm

I have to say that I really like this post!

There is one thing that I can't seem to determine though.

What is the type of flat ribbon cable from the Nexus 7 LCD (Chunghwa) display to the LVDS board you made?
Also, what type of FPC connector is on the LVDS board?

Thanks.

-brad w.

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saper_2
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Re: Nexus 7 LCDs

Thu Dec 29, 2016 12:00 pm

brad.walker wrote: What is the type of flat ribbon cable from the Nexus 7 LCD (Chunghwa) display to the LVDS board you made?
This is the one used in N7 ("the short one"):
N7_2012_fpc.jpg
N7_2012_fpc.jpg (35.74 KiB) Viewed 4897 times
brad.walker wrote: Also, what type of FPC connector is on the LVDS board?
I believe it is: AXT530124 - you should read the topic, I mentioned it.

brad.walker
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Re: Nexus 7 LCDs

Thu Dec 29, 2016 7:20 pm

I believe it is: AXT530124 - you should read the topic, I mentioned it.
I think I understand where the confusion is..

You are correct, that you did post the connector in the topic. I did see this. What was confusing for me is AXT530124 is the connector that plugs into the ribbon cable. On my LCD display I do not have the ribbon cable that came with the board.

What I will do is purchase one from EBay and then reverse engineer it to build my own adapter. Hopefully, I'll be able to post the results when I get this done.

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saper_2
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Re: Nexus 7 LCDs

Thu Dec 29, 2016 7:36 pm

Hi,

Ok, so you have just bare lcd :)
The ribbon fpc cable you have to buy, it's cheap, you can get them on aliexpress for about 2-3USD with shipping. (just be sure you order the short one for nexus 7 2012 (codename ME370 Nakasi). There is also "long one" that is used in nexus 7 2013 - N7 2013 use a 4 or 6 lane (don't remember) MIPI-DSI interface so it useless for us...).

aBUGSworsnightmare posted few post up a link to gDrive: https://drive.google.com/drive/folders/ ... DgtWjNsNXc with his adapter schematic, so there is no need for you to reverse engineering the fpc :D . I have in my plans to build a something more simpler - just a board with AXT-connector and DF14 (plus some caps for power filtering), power for display and & backlight I'm going to provide externally (so no fancy voltage regulator on board ;) - but I maybe use some generic S1117-x.x in SOT-223 ) :)

Look for ME370 service manual there is everything described (AXT pinout & connector part number). I think aBUGSworstnightmare already posted screenshots from SM with the LCD connector pinout & P/N .

I'm attaching the screenshot from ME370 service manual (Nexus 7 2012) with board-to-board connector for LCD.
me370_nexus7_lcd_conn.jpg
me370_nexus7_lcd_conn.jpg (29.1 KiB) Viewed 4811 times

aBUGSworstnightmare
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Re: Nexus 7 LCDs

Sun Jan 01, 2017 4:28 pm

brad.walker wrote:
I believe it is: AXT530124 - you should read the topic, I mentioned it.
I think I understand where the confusion is..

You are correct, that you did post the connector in the topic. I did see this. What was confusing for me is AXT530124 is the connector that plugs into the ribbon cable. On my LCD display I do not have the ribbon cable that came with the board.

What I will do is purchase one from EBay and then reverse engineer it to build my own adapter. Hopefully, I'll be able to post the results when I get this done.
You can have an unassembled PCB for 1.77EUR +19% VAT + shipping (postage for A small letter).
The voltage regulator can be omitted, just supply 3.3V to 5V (max) to the backlight.
Schematic is available, refer to link above
Last edited by aBUGSworstnightmare on Thu Jan 05, 2017 1:38 pm, edited 1 time in total.

eliteSchwein
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Re: Nexus 7 LCDs

Thu Jan 05, 2017 11:27 am

Can i buy a finished PCB with all Components soldert on it?

aBUGSworstnightmare
Posts: 1077
Joined: Tue Jun 30, 2015 1:35 pm

Re: Nexus 7 LCDs

Thu Jan 05, 2017 1:40 pm

eliteSchwein wrote:Can i buy a finished PCB with all Components soldert on it?
In case I still have all components on hands: yes. Let me check and I will come back to you.
Check the BOM (https://drive.google.com/drive/folders/ ... sp=sharing) for the costs. Let me know your location so I can figure out shipping costs.

champagne_charly
Posts: 2
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Re: Nexus 7 LCDs

Mon Feb 13, 2017 5:16 pm

Hi,

Awesome work.. Has Anybody tackled the Nexus 7v2 2013 with LCD TFTMD070021 from JDI with res 1920x1200 ?

http://www.panelook.com/TFTMD070021_JDI ... 20734.html

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saper_2
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Re: Nexus 7 LCDs

Mon Feb 13, 2017 8:46 pm

champagne_charly wrote:Hi,

Awesome work.. Has Anybody tackled the Nexus 7v2 2013 with LCD TFTMD070021 from JDI with res 1920x1200 ?

http://www.panelook.com/TFTMD070021_JDI ... 20734.html

Check my post, few up: viewtopic.php?p=1052897#p1052897 , the N7-2013 (N2 Gen2 / aka ME571(k) ) have a MIPI DSI interface.

Ahhh, beside you have on spec page to which link you provided, tou have there
Signal Interface : MIPI (4 data lanes)
, if RPF open a DSI interface for public (probably hell will frozen earlier ; I'm not sure but self-centered-broadcom have it's last word on this matter too), then might be somebody with enough knowledge to write a driver/configuration for RPi and build interface board (I/F board would be the easiest part....)

champagne_charly
Posts: 2
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Re: Nexus 7 LCDs

Tue Feb 14, 2017 1:20 am

Such a shame. Woudl that apply to all MIPI devices?

Even when using: TC358870XBG?

What about the LD070WU2 for kindle Fire HDX 7?
http://www.panelook.com/LD070WU2-SM01_L ... 21061.html

Could the drivers be taken from the Android port?
https://forum.xda-developers.com/kindle ... evelopment

Excuse my naivety. It would be nice to have this as a possibility.

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