TPS65145: TPS65145 question about the cause of VBAIS voltage becoming 8V?

Dear support member,

I add information.

・PG pin output Low.
・Specification condition is same as "TIDA-00570_2514439b_HI-SPEED_WQXGA_DMD_BOARD_ESD.pdf ".

Best regard.
Bob Lee.

Hi Bobby,

I have notified our expert regarding this topic Please expect a response by 3/21/19.

Thanks,
Aaron

Dear Aaron,

Thank you very much for reply.

I add information.

This schematic （ TIDA-00570_2514439b_HI-SPEED_WQXGA_DMD_BOARD_ESD.pdf ）was in a voltage tripler mode.

This schematic changed to doubler mode, but FB3 stay 0.6V.

（Question)
Could you tell me the cause?
Why is FB3 going to 0.6V?

Best regard.
Bob Lee.

Dear Aaron,

Thank you very much for reply.

I add information.

（Add information)
Removed R26 and R27 from this schematic (TIDA-00570_2514439b_HI-SPEED_WQXGA_DMD_BOARD_ESD. Pdf).

（Result）
As a result was VBIAS output 16V, FB3 output 1.21V.

（Schematic）
Removed R26 and R27.
Q7 used MMBT2907A.
Q8 used MMBT2222A.
Q9 used MMBT2222A.

I used same this schematic (TIDA-00570_2514439b_HI-SPEED_WQXGA_DMD_BOARD_ESD. Pdf).

（Question)
Could you tell me some advice on how to fix this circuit?

Best regard.
Bob Lee.

Hello Bob,

I reviewed this thread and schematics and it seems that VBIAS and FB3 were low due to overload condition at VBIAS output. After removing the overload VBIAS seems to be working fine. So there is no issue with TPS65145 circuit and unfortunately, I am not familiar with this DLP reference design. We will try to involve appropriate team who may be familiar with this reference design.
Kind Regards,
Liaqat

Dear Liaqat,

Thank you very much for your answer.

My customer use same DMD board schematic (TIDA-00570_2514439b_HI-SPEED_WQXGA_DMD_BOARD_ESD. Pdf).

As Urgent, Involve appropriate team who familiar with this reference design.
And please answer the following questions.

（Question)
Could you tell me some advice on how to fix this circuit?

Please answer promptly.
Because,I want to answer my customer by 3/27/19 of Japan time.

Best regard.
Bob Lee.

Hi Bob Lee,

Please provide me your schematics.'

-ykc

Dear ykc

Thank you very much for reply.
I will report the progress.

The mounting maker made a mistake in the part.
(Q7, Q8, Q9 mistake at the part)

The parts of the circuit diagram have been replaced by my customer.
I will feedback you after the implementation.

Best regard.
Bob Lee.