Samsung UN55MU8000 - Backlight But No Picture Problem

[lotas]

Re: Samsung UN55MU8000 - Backlight But No Picture Problem

You don't need to supply any power, you just need to put a jumper between FB_TRDY_1 and FB_TRDY_3.

[KYBOSH]

Re: Samsung UN55MU8000 - Backlight But No Picture Problem

You don't need to supply any power, you just need to put a jumper between FB_TRDY_1 and FB_TRDY_3.

Okay I am back with voltage readings after jumping FB_TRDY_1 and FB_TRDY_3.

AVDD_17V = 0V
HAVDD_8.5V = 0V
VGH = ~0V (actually it was 0.065v
STVP1 = 0V
Panel_3.3V = 3.3V

There were a few other test points I hadn't noticed or paid attention to before so I took their measurements anyway.

SFC1 = 1.85V
VCCA_1.9V = 1.9V


If I recall correctly there is no change from before jumpered the FB_TRDY_1 and FB_TRDY_3.

Does this mean that the T-Con portion of the mainboard is non-operational?
Is that a firmware issue? I remember checking all the PMICs and they seemed okay.

[Davi.p]

Re: Samsung UN55MU8000 - Backlight But No Picture Problem

How can you check a pmic? maybe pmic has internal registers and those are cleared... need mainboard replacement, but on the market there is a gadged of a tiny board reproducing all standard trimmable tensions of a lcd display.. this only for testing purposes... china market..