820-3332 connects, but has no image or backlight, without thunderbolt and HDMI.

[iClub]

PPbus_g3h 12.59v, PP5VR3V3_SW_LCD_UF 0v with connected LCD; PP1V5R1V35_GPU_REG_R oV with oscillation.

It already replaces the components u8900, u9100 and u9000 based on reading posts, but it remains the same, I need help to solve this mac.

 

[2informaticos]

Do you get CPU voltages?
Did you test for USB activity?

 

[iClub]

the USBs work, read the external MacOS, gives the sound of turning on, but without any image on the external and with an LCD that I'm sure works.
there are no signs of oxidation.

Voltage CPU :
PPVCORE_S0_CPU 0.85V; PP1V05_S0 1.05V ; PPVCORE_S0_AXG 0.81V;

already caught similar defect in macbook pro 15 2011 in the gpu, is that what it is?

 

[2informaticos]

Looks like GPU issue, if no external video too.
On Internet exist few hardware mods to disable GPU; never tested yet for this kind of board...

 

[iClub]

Do you know any way to disable the gpu on this mac?if you can send a link to a video showing how you do it I appreciate it, I looked but I couldn't find it.