SMD IC identifying problem or schema needed for BigBlue AL2600xwp

[Fozzie]

Hello, I'm repairing a BigBlue AL2600xwp lamp and I need to know the identification of the SMD IC on the PCB.
The lamp has 4 white XML leds for 4 levels (260Lm-650Lm-1300Lm and 2600Lm) and 2 red XPE leds (150Lm)
There is no markings on the top or bottom of the IC, see photos.
Only on the bottom I can see A215 09 burned in, buth I think this is a machine number of production.
If someone have a idee of the identification of the IC or schema for me.

THANKS

 

[stenzer]

Hi,

this might help to identify the IC, if there is a marking on the package at all

BR

 

[Fozzie]

Hi stenzer,
Thanks for your help, but like you can see in the picture....nothing

BR

 

[stenzer]

Have you tried to check the package surface from different angles. Especially the angle of the ligth is critical, see here.

 

[Fozzie]

Hi stenzer,
Thanks for your help, done all the tricks like in the video, but like you can see in the pictures....still nothing
The only number I can see is on the bottom (Photo_05).

BR

 

[betwixt]

The number on the bottom is an impression from the molding machine and has nothing to do with the IC type.
I would guess the IC was bulk purchased without any printing to save costs or the unit manufacturer has sanded it off to prevent the design being duplicated. Again guessing, it will be some kind of MCU so even if you could find its type number you would still need the program to load inside it, a new one would be blank. Your only option is to trace the schematic by hand and match the part to its apparent pin functions. There are some clues, U2, D1,D2 and L1 look to be a power regulator or more likely a voltage booster for the LEDs and unless there are parts on the reverse side of the board there is no clock source for them so the MCU must be providing it.

Brian.