Connect40 Loewe TV manual / advice please

[zen]

Hi all

This set seems to power up , with LED at front changing to GREEN , but no picture , or backlight , plus cannot set TV back to standby .

Suspecting main board issue .

Powered the backlights independently & they light up ok .

Disconnected HDD & powered , with same results .

Checked supplies at all the buck regulator outputs on main board & again seem ok .

Anyone have experience working on this model .

[zen]

Re: Connect40 Loewe TV manual / advice please

On lifting the main board , suspect i have discovered the issue .

There's quite a chunky silicon thermal pad the sits between the chassi & underside of BGA CPU chip .

Pad had leaked out quite badly & i suspect damaged CPU .

Washed the main board with flux cleaner , then IPA , but didn't help.

Now i require a board .

Can anyone help ?

[zen]

Re: Connect40 Loewe TV manual / advice please

Turn of event it seems .

Allowed the board cool down fully , as it had been sitting on pre-heater , then powered again .

To my delight set powered ,with half picture good & the other noise .

Pressured the LVDS processing chip & picture corrected itself .

Time for a re-ball me thinks .

[dskall]

Re: Connect40 Loewe TV manual / advice please

So need to reflow chips.

[zen]

Re: Connect40 Loewe TV manual / advice please

The LVDS BGA chip , yes .

I tend to re-ball rather than re-flow , as it's more reliable .

[dskall]

Re: Connect40 Loewe TV manual / advice please

I would at least reflow main chip also

[zen]

Re: Connect40 Loewe TV manual / advice please

Thanks , did consider that also , but will see how the LVDS chip re-ball goes .

[zen]

Re: Connect40 Loewe TV manual / advice please

Stencil arrived , re-balled LVDS chip & TV now running on test .

No audio via HDMI 1 for some reason , but not really concerned , as customer has another 3 ports to play with .

[nomoresonys]

Re: Connect40 Loewe TV manual / advice please

Interesting, have not seen a tv with an actual sata hard drive.

[zen]

Re: Connect40 Loewe TV manual / advice please

Hi yes , Loewe have to be different .

Set also seemed to be shutting down by itself, but to be fair i had been running it without heat sinks on LVDS & CPU chips , albeit with a fan pointed at them .

Refreshed thermal paste & fitted the sprung loaded heat sinks back & now seems to be behaving .

May potentially need to also re-ball CPU at some point therefore will order a stencil for that as well .