Sony KD-65XD9305 - DPS fault

[pic_whiz]

Hi,

I'm due to remove a faulty DPS board for this TV today. I know they are a common fault in various Sony sets. I'm just wondering what actually goes faulty on these boards?

I've read it's a certain IC, although I don't know which one it could be and that the fix is a different version of this chip.

Any pointers?

Many Thanks,

Matt

[diif]

Re: Sony KD-65XD9305 - DPS fault

Do you know for sure it's the DPS board ? https://www.sony.co.uk/electronics/s...icles/00180172

[pic_whiz]

Re: Sony KD-65XD9305 - DPS fault

Not yet, but I know it's very common for a dead set.

I've seen the free repair, but i've been asked to repair rather than get Sony involved - not sure the free repair works with second-hand units either.

[zomi]

Re: Sony KD-65XD9305 - DPS fault

This might help ..

but i think the chip is TPS54334DDA goes on these and a fuse..
IC408 and an smd fuse, F404 fitted to the DPS board.
These were the parts being sold for a repair kit.

I tried it on a set but it did not work for me.
and did not have time to investigate further
maybe it will be better for you

[zomi]

Re: Sony KD-65XD9305 - DPS fault

this may help too

https://www.berlin-repariert.de/sony...eine-funktion/

use translate read

[pic_whiz]

Re: Sony KD-65XD9305 - DPS fault

this may help too

https://www.berlin-repariert.de/sony...eine-funktion/

use translate read

Many Thanks Zomi, that's excellent information.

Much obliged

[zomi]

Re: Sony KD-65XD9305 - DPS fault

No problem
please update the thread to let us know how u get on

thanks

[pic_whiz]

Re: Sony KD-65XD9305 - DPS fault

Quick update,

Tested the DPS in-situ, 24volts present on both sides of Fuse F404. No output from the TPS54334. SW Output resistance to ground is 8 Ohms.

Removed IC from the board, 8 Ohm resistance present between SW output and GND. Ordered replacement IC.

Found another DPS board on eBay listed as new and appears to have a resistor mod. See attached photo. My guess is it's either a 12K or 82K Ohm resistor to strap the PGOOD pin on the TPS54334 to GND - A strange mod as the Datasheet suggests this pin should be pulled up to VDD (max 6v) using a 100K Ohm resistor. Would be interested to know how this mod works? On original board the PGOOD pin seems to be floating?

Cheers,

Matt

[pic_whiz]

Re: Sony KD-65XD9305 - DPS fault

TV is now fixed!

Replaced TPS54334, tied PGOOD pin to Ground via 100k resistor instead of leaving it floating.

Cheers,

Matt

[platinum123]

Hello, does anyone know the resistances of R473 and R474 connecting pin 7 to ground?

Thanks