I had to change the AP board because I broke the button connector. Asked the official reseller and they sent me a new one. I installed it following the bambu lab wiki and there is no image in the lcd. I checked the ribbon cable connection and it’s ok.
Then i reinstalled the old Ap board and it shows lcd images.
The Ap boards look like the same, only 1 difference. The original one is v7 and the new one is v6.
Is the new one (v6) compatible with my printer or maybe is broken??
In the picture the left one is the new and the right one the original.
Your diagnostic process is sound, and thank you for posting clear side-by-side photos. However, please note that this is a community forum, so it’s unlikely you’ll get a response from a Bambu employee here. This is the kind of issue that only their engineers can definitively address unless you get lucky and someone with a similar experience chimes in. So if you haven’t already done so, you’ll definitely want to open a ticket with Bambu to see if they might have a remedy. It could be as simple as desoldering or cutting a resistor from the board.
Based on my experience with LCD displays and your diagnostic efforts, I would wager that the rev 07 board likely requires a newer LCD. It’s very possible that the revision was needed to support a different vendor. This idea is supported by the fact that you validated the display as functional in the old configuration, which suggests that the firmware on the new board has timings and display expectations that do not support your variant of LCD.
One thing you might try is asking the reseller that you got the AP board from if they have a matching display to go with the rev 07 board.
The seller should have provided a match by asking about the revision.
In many cases this is important for the firmware as well as it might not work with other revision boards.
Best to contact the seller for a replacement to V7.
I had a similar experience but it was over a year ago so I can’t remember if it was the same exact version numbers you have. I had an AP board die and the first one Bambu sent me was from the discontinued “X1” model and not an “X1C”. I’m at work but when I get home I can search my hard drive and see if I still have pictures of the boards because I was sending them pics each step of the way.
So I found the actual boards. The one that went bad was V5_RO6 and the replacement Bambu sent me was V5_RO2. So its not exactly the same situation. Also I realized that at some point my screen must have worked with the R02 because I remember complaining to support that the menu said “X1” instead of “X1C” and that none of the data like the included models was there. After that they sent me the correct board. I wonder if the reseller sent you a used board that has problems?
I asked the reseller an advice. Just wanted to know if someone else had the same issue and how they solved it.