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official 7" touchscreen LCD black lcd & no power up!!

Posted: Sun Dec 20, 2015 2:04 pm
by gaeran
Hello?.

I have problem with my official 7" LCD. please help!!
The ribbon cable is fine and connected right way.
when I power up, the screen shows nothing and back-light is not work.

I have had powering two ways.
5V -> pi -> lcd : not working
5V -> lcd -> pi : not working.

here is what I did.

1. new image download RASPBIAN JESSIE (Released 2015-11-21)
2. sudo apt-get update
3. sudo apt-get upgrade
4. sudo rpi-update
5. sudo reboot

6. lsmod
[email protected]:~ $ lsmod
Module Size Used by
evdev 10552 4
cfg80211 399468 0
rfkill 16799 2 cfg80211
r8188eu 432632 0
snd_bcm2835 19739 3
snd_pcm 75040 1 snd_bcm2835
snd_timer 18668 1 snd_pcm
bcm2835_gpiomem 3023 0
snd 52620 9 snd_bcm2835,snd_timer,snd_pcm
uio_pdrv_genirq 2986 0
uio 8228 1 uio_pdrv_genirq
i2c_dev 6108 0
fuse 82598 3
ipv6 343236 30

[email protected]:~ $ dmesg|grep -i ft5406


7. add "dtoverlay=rpi-ft5406" on /boot/config.txt

sudo vi /boot/config.txt
dtoverlay=rpi-ft5406

sudo reboot

[email protected]:~ $ dmesg|grep -i ft5406
[ 4.997104] rpi-ft5406 rpi_ft5406: Probing device
[ 4.997293] rpi-ft5406 rpi_ft5406: Touchscreen not detected


I have no idea with this.
Please help.

Thank you.

Regards,

Kevin.

Re: official 7" touchscreen LCD does not work!!

Posted: Sun Dec 20, 2015 4:18 pm
by ulix
What does not work?
Have you connected the ribbon cable the right way? All cables the right way?

Most displays work out of the box, with the new raspbian (as well as with wheezy) :!:

Re: official 7" touchscreen LCD does not work!!

Posted: Mon Dec 21, 2015 2:23 am
by gaeran
Hi,

Thank you for the reply.
ribbon cable is fine. all right way. I've checked out many times. but the screen is black.
I didn't think about try with wheezy. but the JESSIE is the new one right?.
I'll try wheezy today. let you know the results.

many thanks.

Regards,

ulix wrote:What does not work?
Have you connected the ribbon cable the right way? All cables the right way?

Most displays work out of the box, with the new raspbian (as well as with wheezy) :!:

Re: official 7" touchscreen LCD does not work!!

Posted: Mon Dec 21, 2015 9:22 am
by ulix
I don't think it's the distro. The display must flash up when powering up...
How did you do the power supply for the display?

Re: official 7" touchscreen LCD does not work!!

Posted: Mon Dec 21, 2015 9:32 am
by gaeran
I've tried
1. power from pi
2. smartphone power supply
3. usb power from pc

not tested lcd power to pi.

is there led on lcd board for identify power activity?.

how can I figure out the lcs board is working properly?

do you have a test method of lcd board?

Thank you.
Regards,

Re: official 7" touchscreen LCD does not work!!

Posted: Mon Dec 21, 2015 9:35 am
by RaTTuS
a decent 2A+ PSU
power the display from that
power the RPI from the Display

Re: official 7" touchscreen LCD does not work!!

Posted: Mon Dec 21, 2015 10:46 am
by ulix
The display wont work if it is powered after the rpi.
Like mentioned from RaTTus first driver board display then from there rpi.

Re: official 7" touchscreen LCD does not work!!

Posted: Mon Dec 21, 2015 11:50 pm
by gaeran
Hi RaTTuS, ulix,

power lcd -> pi.
It was not effective for me.
I rather check my lcd board.

Is it possible damage on lcd board if I feed 5.13V for the lcd power?

How can I get my lcd board's status dead or alive?

Thank you.

How can I get Official 7" lcd board is dead or alive?

Posted: Wed Dec 23, 2015 1:22 am
by gaeran
Hello?.

I have problem with my official 7" LCD. please help!!

Symptom :
1. the screen shows nothing = black
2. back-light not work.

The flat ribbon cable is fine, connected right way.

I have had powering up two ways.
5V -> pi -> lcd : not working
5V -> lcd -> pi : not working.

The pi OS image is newest version and upgraded.
I have tried may ways to revive my lcd screen. but it gives me pain.
So, I would like to check the lcd board's condition.
I have a basic electronic tester and dso138 oscilloscope. but not a expert of electronics.

Do you have any test sequence for the lcd board's condition?
Any suggest is welcome.

Thank you.

Best Regards,

Kevin.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Wed Dec 23, 2015 11:43 am
by texy
Kevin please don't keep raising new threads on the same subject.
Texy

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Thu Dec 24, 2015 10:07 pm
by ulix
Since there are no schematics it's hard to troubleshoot.
I personaly think it has something to do with the supply voltage. Could you measure it on the lcd board?
Please add some pics of you setup with the display! Then we can investigate further...
And I don't think you will break it with 5.2V.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Fri Dec 25, 2015 7:24 am
by gaeran
Hi ulix,

Yesterday, I had asked to local Rpi distributor for check out the AD board status.
I believe they will shipping for RMA if it was defective.
or I could buy a new lcd. :(

Happy Christmas!!

Thank you.

Regards,
Kevin.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Fri Dec 25, 2015 10:22 am
by ulix
please keep us posted! ;)

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Tue Jan 05, 2016 6:23 am
by lanewinfield
This was happening to me too, until I realized I was being an idiot and the SD card had slipped out a bit—are you sure it's properly seated?

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Thu Jan 07, 2016 6:39 am
by gaeran
Hi,

I've got answer from local distributor.
In my case, (I was remove USB port and 5 pin from AD board as below image link) because of my AD board was modified. they can not process RMA.
Image
So, I asked them if I can buy a new AD board, and answer was NO.

This is so bad case.

Regards,

Kevin.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Thu Jan 07, 2016 9:33 am
by hansotten
gaeran wrote:Hi,

I've got answer from local distributor.
In my case, (I was remove USB port and 5 pin from AD board as below image link) because of my AD board was modified. they can not process RMA.

So, I asked them if I can buy a new AD board, and answer was NO.

This is so bad case.

Regards,

Kevin.
Indeed bad luck. But the distributor is right, modifying a board as you did is always a valid reason for refusing warranty.

Are you sure (you did not tell us you did this mod!) the mod is not the cause of your problems? Removing an USB port is quite some surgery.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Thu Jan 07, 2016 12:29 pm
by gaeran
hansotten wrote:
gaeran wrote:Hi,

I've got answer from local distributor.
In my case, (I was remove USB port and 5 pin from AD board as below image link) because of my AD board was modified. they can not process RMA.

So, I asked them if I can buy a new AD board, and answer was NO.

This is so bad case.

Regards,

Kevin.
Indeed bad luck. But the distributor is right, modifying a board as you did is always a valid reason for refusing warranty.

Are you sure (you did not tell us you did this mod!) the mod is not the cause of your problems? Removing an USB port is quite some surgery.

Hi,

Yes, I had confirmed no problem after I soldering for the stuffs off.

Thank you anyway.

Regards,

Kevin.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Sun Jan 10, 2016 11:05 pm
by ulix
Maybe we can find the error.
Could you post some pictures from the board? So we can see how the desoldering was done?
Then we could look into the board...

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Mon Jan 11, 2016 5:58 am
by gaeran
ulix wrote:Maybe we can find the error.
Could you post some pictures from the board? So we can see how the desoldering was done?
Then we could look into the board...
Hi,

You can see a picture with below link.
http://thingiverse-production-new.s3.am ... atured.jpg

thank you.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Mon Jan 11, 2016 7:55 am
by texy
gaeran wrote:
ulix wrote:Maybe we can find the error.
Could you post some pictures from the board? So we can see how the desoldering was done?
Then we could look into the board...
Hi,

You can see a picture with below link.
http://thingiverse-production-new.s3.am ... atured.jpg

thank you.
..I think he means a much closer view of the desoldered connector ;)

Texy

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Fri Feb 05, 2016 9:46 am
by gaeran
Hi,
Sorry for late update.
I've just get back my LCD and AD board from local distributor. Now I found AD board was defected.

I would like to revive the AD board if I could Please help!

https://goo.gl/photos/hsSQXQunL8HNCarM9
https://goo.gl/photos/pnLz7QNQowFeL8738

Thank you.

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Fri Feb 05, 2016 9:55 am
by texy
Unfortunately you voided the warranty by attempting rework yourself, but I wish you luck......

Texy

Re: official 7" touchscreen LCD black lcd & no power up!!

Posted: Fri Feb 05, 2016 11:22 pm
by gaeran
Hi,

Sorry but, I can't find warranty guide for my lcd. Do you know where is the warranty guide for lcd?
I just have safety guide in my box.
texy wrote:Unfortunately you voided the warranty by attempting rework yourself, but I wish you luck......

Texy