[SOLVED] Died VU7A+ ?

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zyssai
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[SOLVED] Died VU7A+ ?

Post by zyssai »

Hi!

I'm installing an N2+ with Android into another Renault Laguna III, like this topic I've created
viewtopic.php?f=182&t=42184

Image
Image

The problem is that after finishing installation, the screen doesn't work anymore.

The green and red led of the VU keeps on, with or without HDMI attached.
The screen stays dark, i even don't have 'NO SIGNAL' message.

There is no metal part behind the screen into the car.
I have done the mod to control brightness, it worked perfectly, i removed it since the screen seems dead.
I need help because it's not my car, so I installed my screen into this car and my car doesn't have screen anymore :lol:
Last edited by zyssai on Sat Aug 28, 2021 1:44 am, edited 1 time in total.

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Re: Died VU7A+ ?

Post by odroid »

Can you connect the damaged Vu7a+ to a PC or laptop computer to narrow down root causes?
Was the LCD backlight LED on?

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Re: Died VU7A+ ?

Post by zyssai »

Thanks. While connected to computer, green led is on, but no display at all. I think backlight is off.

After some tests, I can see the screen is completely dark (i already have some backlight problem with a tv, you can see a bit of the display, but here it's like screen is off)

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Re: Died VU7A+ ?

Post by odroid »

I think the LCD backlight driver IC might be damaged by unknown electrical shock. :(

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Re: Died VU7A+ ?

Post by zyssai »

You talk about this part?

Image

Is there some fuses anywhere that I can check?

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Re: Died VU7A+ ?

Post by zyssai »

I will check tomorrow Vin and Vsw values

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odroid (Fri Aug 20, 2021 9:25 am)

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Re: Died VU7A+ ?

Post by zyssai »

I have 4.19V at all pins, only GND and FB are at ground.
But every 2 seconds, EN pin changes from 4.19V to ground.
Does it corresponds to NO SIGNAL display backlight?

I've just seen that 4103 is really burning, it's hot as hell.
I've ordered some news ic's.
I hope it's just this component that is dead

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Re: Died VU7A+ ?

Post by joerg »

@zyssai: Try to remove the wire and clean the soldered pin, maybe there is a invisible connection. In my original post I used a resistor in serial, this is always a good idea.

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Re: Died VU7A+ ?

Post by odroid »

zyssai wrote:
Fri Aug 20, 2021 4:33 pm
But every 2 seconds, EN pin changes from 4.19V to ground.
Does it corresponds to NO SIGNAL display backlight?
Is the EN pin connected to the PWM output of N2+ GPIO?
N2+ GPIO output level should be near 3.3Volt at maximum.

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Re: Died VU7A+ ?

Post by zyssai »

joerg wrote:
Fri Aug 20, 2021 5:14 pm
@zyssai: Try to remove the wire and clean the soldered pin, maybe there is a invisible connection. In my original post I used a resistor in serial, this is always a good idea.
Thanks, the wire is already desoldered, it's an old picture. There is a resistor before connection to gpio.
The connection seems goods as I have 0ohm from pin4 to the brown component.

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Re: Died VU7A+ ?

Post by zyssai »

odroid wrote:
Fri Aug 20, 2021 5:36 pm
zyssai wrote:
Fri Aug 20, 2021 4:33 pm
But every 2 seconds, EN pin changes from 4.19V to ground.
Does it corresponds to NO SIGNAL display backlight?
Is the EN pin connected to the PWM output of N2+ GPIO?
N2+ GPIO output level should be near 3.3Volt at maximum.
Yeah it's ok, before it dies backlight control worked properly.
My second screen is connected as the same way.
Didn't know what happened. Perhaps I taked the screen with my hands and makes a shortcut.

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Re: Died VU7A+ ?

Post by zyssai »

I have received 4103 IC's and....
It's f*ckin' small!!! :lol:

Image

I've just seen after desoldering that I have a damaged pad.
It's not entirely breaked so I can use it.

Image

After a few minutes of battle, it's ok! I tested connection between pads and it seems to be good.

Image

It's alive!!! I'm so happy!
Thanks for the help!!

Image

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Re: [SOLVED] Died VU7A+ ?

Post by mad_ady »

Oh, no! It's now running Windows!



What tools did you use to do the fix?

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Re: [SOLVED] Died VU7A+ ?

Post by joerg »

Possible tools...
Benzinlötlampen_und_Lötkolben.jpg
Benzinlötlampen_und_Lötkolben.jpg (257.34 KiB) Viewed 428 times
Von M_H.DE - Eigenes Werk, CC BY 3.0, https://commons.wikimedia.org/w/index.p ... d=16427020
:D
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zyssai (Sun Aug 29, 2021 1:21 am)

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Re: [SOLVED] Died VU7A+ ?

Post by zyssai »

mad_ady wrote:
Sat Aug 28, 2021 2:31 am
Oh, no! It's now running Windows!

Image

What tools did you use to do the fix?
Just plugged to my 'family computer' for testing :lol:

A simple soldering iron, with some flux to simplify soldering.
Precisely this one:

€ 5,18 44%OFF | New Adjustable Temperature Electric Soldering Iron 220V 110V 60W 80W Welding Solder Rework Station Heat Pencil Tips Repair Tool
https://a.aliexpress.com/_vVjqfG

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Re: [SOLVED] Died VU7A+ ?

Post by odroid »

Glad to hear that.
Your soldering skill is quite descent. :o
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zyssai (Mon Aug 30, 2021 12:58 pm)

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Re: [SOLVED] Died VU7A+ ?

Post by mctom »

Just for the record, the damage might have occurred by connecting wires in the wrong order. This is relevant when you connect something to already powered on circuit, because I assume you didn't disconnect the car battery first. ;)
So, as a rule of thumb, always connect grounds of everything first, then proceed with positive terminal, and finally signals.

If you look closely at the USB plug, its power pins are longer than data pins, exactly for this reason - to ensure the potential reference is present first.

About your soldering, I admire your courage. SOT23-6 is rather pleasant to work with once you get a grasp on it and I congratulate reaching that point.
My local electronics shop don't stock 0402 components because, they say, "no point selling something that is impossible to solder by hand" :D
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Re: [SOLVED] Died VU7A+ ?

Post by zyssai »

mctom wrote:
Mon Aug 30, 2021 4:20 pm
Just for the record, the damage might have occurred by connecting wires in the wrong order. This is relevant when you connect something to already powered on circuit, because I assume you didn't disconnect the car battery first. ;)
So, as a rule of thumb, always connect grounds of everything first, then proceed with positive terminal, and finally signals.

If you look closely at the USB plug, its power pins are longer than data pins, exactly for this reason - to ensure the potential reference is present first.

About your soldering, I admire your courage. SOT23-6 is rather pleasant to work with once you get a grasp on it and I congratulate reaching that point.
My local electronics shop don't stock 0402 components because, they say, "no point selling something that is impossible to solder by hand" :D
For the damage, i think it appears when I tried to move screen while is was on, but didn't pay attention that it has turned off. When I saw that, I tried to power on again, but it was too late.
I think I touched PCB with hands, very surprised that it causes damage.

Yeah I know the trick of the usb pins, it has some logical, than IC's are powered on, before data comes.

That was the first time I soldered this type of IC's, i have no microscope, camera or magnifying glasses, i soldered few times ago USB type C connector inside a smartphone, really fun time :lol: i sweated a lot !
I ordered IC's from AliExpress, the only place I find this type of components. Sometimes on ebay too.

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Re: [SOLVED] Died VU7A+ ?

Post by mctom »

Touching PCB isn't a likely cause of damage. you could have caused an ESD and damaged something, or touch some high-value resistor and decreased its value significantly, but I've seen that happening just once (on a dual stage discrete push-pull amplifier).

Maybe your wiring wasn't solid, and as you moved your screen around the ground connection was lost for a split second. Who knows! But if I were you, I'd get to the bottom of this problem, because you have just made an automotive grade project, which means it must be shock proof. That's incredible how easy it is to destroy electronics in a car.
zyssai wrote:
Tue Aug 31, 2021 3:28 am
Yeah I know the trick of the usb pins, it has some logical, than IC's are powered on, before data comes.
This is not the whole story though. If you connected data lines and just one of the power supply pins, you're quite likely to damage protection diodes on either side of the link. That's why it is very important to keep that in mind - power first, always! And I still think this is the most likely cause of the damage your display suffered.

I don't have microscope either, my everyday glasses are good enough. :) And I refuse to replace any USB connectors ever again :D I always ask a technician at work to do that for me, and offer a bottle of wine.
These ICs might be available only on Aliexpress because there is a ton of China brands that are not distributed in Mouser or Farnell. When I fix stuff I'm trying to find a counterpart from any western manufacturer. It's tedious, but doable, because somehow these chinese components often have the same functionality and pinouts. Hmm strange.
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