Mercedes Vito - w447 - NO Backlights in LCD

[CARPARTS]

a very common problem in Vito w447 / 2016

No backlights working behind the middle LCD
LCD work 100% and all other function work perfect

Someone has repair info ?

Thx

[rob h]

I have one, just like this.
Did you, or anyone figure out how to fix this?
Dash still works, just very dimmed.
Changing lcd, does not help.
Plug in other cluster, that is fine.

For now, we will exchange cluster.


I also found this on dk.
https://www.digital-kaos.co.uk/forums/showthread.php/821114-W447-Viano-Dash-LCD?highlight=w447

[CARPARTS]

Did you, or anyone figure out how to fix this?

I also found this on dk.
https://www.digital-kaos.co.uk/forums/showthread.php/821114-W447-Viano-Dash-LCD?highlight=w447

did not find a solution yet

has nothing to do with filter or similar can-bus elements.

the problem is on the main board, thats for sure, but where......

[rob h]

Then i will swapp the hole cluster.
Thank you!

[raf0468]

hi have same problem on 447 dash i know there is a fix out there anyone willing to share which component is to be changed,
no filter on this one its common problem..

[rob h]

Is this a Johnson control flaw.
Are the vdo cluster better?

[salkapone]

measure.............

[CARPARTS]

give me picture of front side board (around mcu) il show u which components are problem !!

here is the requested picture ....

[escargot08]

Hello,

I have the same problem on my W447. Does anybody can tell me what to change please?

Regards

[credoline]

I have the same problem on W447 instrument cluster, display work but no backlight. I am contact minitools.com and they told me that problem is on main board. Anyone know where is problem ? I need to repair myself. I can not send it to outside country.
Thank you

[drpeter]

I have the same problem on W447 instrument cluster, display work but no backlight. I am contact minitools.com and they told me that problem is on main board. Anyone know where is problem ? I need to repair myself. I can not send it to outside country.
Thank you .................................................. ..............................................

[credoline]

Both of transistors are okay, tested with component tester and also replaced. All resistors around them are also ok.
Anythyng else?


.................................................. ..............................................

[Alawigmx]

I had a similar error, I had ripped a small capacitor and its trace in top right corner of cluster (from back), repaired trace and checked continuity, all worked fine afterwards.

[ggmar]

I have the same problem. Anyone know the solution?

[Alex79]

Both of transistors are okay, tested with component tester and also replaced. All resistors around them are also ok.
Anythyng else?

Hello ! I have same dash with same problem, bought new LCD but still no back light, but graphic and all working OK. Mine cluster dont have CAN filters or any of that. I've also heard about BCP53 replacement and component in surrounding , but nothing. Now Im re soldering all bigger resistors. Does anyone have solution, I have dash on my bench for testing.

Best regards
Alex L

[Alex79]

I've tought that is something wrong with display but cant find anything. And for new display people are shurre that is OK.
That small ribbon is for display lightning , and IC401 is LED driver SC441A.
But no need to touch and open display !

[pipina]

Any news about this problem? I have the same one

Regards

[Woelfli]

Hallo, hast du die defekte Lötstelle gefunden.
Gruß Wolfgang

[vince12345]

Hi I had same problem and I replaced bcp53 and this transistor and problem solved, ����898714898715

[Yzeb]

Hi Vince,

I also replaced BCP53 (x2) and display, but backlight doesn't work....
Do you have the reference of the 6 pins transistor that you have replaced ?

Thanks

[Yzeb]

Hello,
I replaced the 6 pins by a BC847BS 45V 100mA NPN/NPN transistor. back light works ! :)

[gcelettronica]

very thank friend solved

[Aantom]

Where to by the transistors?

[dorinc]

This is how i solved this. 2x bc337

[Spacehb88]

Anybody got pictures of what transistor requires changed, can see both bcp53

[bogilase]

Thanks dorinc ! I tested the original tiny 6 pin SOT363 package, double NPN transistor that was put there by the manufacturer using an ESR/transistor tester. Surprisingly enough, it read ok with the low currents fed through it by the tester. I'm not sure why the component doesn't work in the actual circuit, with actual currents and frequencies, because I did not bother to do further testing. So I was skeptical at first with going ahead with implementing your fix. Eventually I did it anyway and surprise, surprise, it worked! I used 2 x C945 NPN transistors salvaged from an old PC PSU to implement the fix because that is what I had available. I just made sure that the ECB layout of these NPN transistors are soldered correctly to the corresponding pads of the removed SOT363 transistor. Many thanks !

Of course, the easiest fix would have been replacing the 6 pin transistor with a BC847BS or something similar.