TFP401 Problem - No Data Out

Richard Fuetterer

Other Parts Discussed in Thread: TFP401

Hello,

i've a Problem with the TFP 401 IC.

It is connected to a HDMI source and a HDMI Input comes in. But i get no data out. Also there is no signal at the HYSNC and VSYNC, both al logic high.

I have attached the schematic.

in the board the wires are less the 1 inch long on the TDMS side.

Could somebody help me ?

Thanks

Richard

over 11 years ago

0 Elias Villegas M. over 11 years ago

TI__Guru* 76130 points

Hello,

I have some comments regarding the schematic:

1) Connect PD# to Vcc.

2) Disconnect SCTD from Vcc

3) Connect SCDT to PDO#

4) The digital, analog and PLL voltage rails must be isolated from each other, they also need to be filtered.

Have you tried different clock frequencies?

Does the HDMI signal contain embedded audio? The TFP401 does not support HDMI with embedded audio.

Regards.

0 Richard Fuetterer over 11 years ago in reply to Elias Villegas M.

Prodigy 30 points

Thank you for these informations,

I think point 1 to 3 i can do at the existing pcb.

A question to point 4: Do you think its ok when i put a few 100nF to each rail and connect this trough a filter inductor to VDD33?

I have used several resolutions up from 800x600.

There is no audio stream.

Thanks

Richard

0 Richard Fuetterer over 11 years ago in reply to Richard Fuetterer

Prodigy 30 points

It works, thank you very much.

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TFP401 Problem - No Data Out