820-2915 No Video

[Ryanlen2]

Hi. This board chimes and boots. No internal external video. No liquid damage. Missing PP3V3_ SW_LCD. LCD_PWR_EN is 0.12V. No short on line. (.537). Heated GPU to 100 C. No change. Thanks, have a good one.

 

[aprendiz]

Voltage on PPVCORE_GPU??

 

[dukefawks]

We all know where this is going.....
Is it a nice Apple refurb with no serial number on the RAM slot?

 

[Ryanlen2]

aprendiz ... Thanks for the response, I will check.

dukefawks ... Lol!! ... Idk man. I dont remember. I will check in the morning.

Thanks. Have a good one guys.

 

[Ryanlen2]

Hi. I have 1.12V on PPVCORE_GPU. Thanks.

It actually does have serial number.

https://photos.app.goo.gl/RR2EjOaN364ZiXT83

 

[dukefawks]

GPU voltage should drop down to 0.9V once GPU is initialized. Was this thing already messed with? Check all the caps in the PCIE lines to the GPU.

 

[Ryanlen2]

Edge bonding is still in tact. No burnt up probe points or caps on board. Only thing not original was thermal compound. I will check your suggestion. Thanks. Have a good night.

 

[Ryanlen2]

Hi Duke.

C8145 - C8150 All look good. Voltage @ 1.759
C8151 - C8158 Look good as well, Voltage @ .974

Thanks.

 

[dukefawks]

Diode mode on both sides of caps?

 

[Ryanlen2]

C8145 - pin 1: .293 pin 2: 0
C8146 - pin 1: .293 pin 2: 0
C8147 - pin 1: .293 pin 2: 0
C8148 - pin 1: .293 pin 2: 0
C8149 - pin 1: .293 pin 2: 0
C8150 - pin 1: .293 pin 2: 0
C8151 - pin 1: .104 pin 2: 0
C8152 - pin 1: .104 pin 2: 0
C8153 - pin 1: .104 pin 2: 0
C8154 - pin 1: .104 pin 2: 0
C8155 - pin 1: .104 pin2 : 0
C8156 - pin 1: .104 pin 2: 0
C8157 - pin 1: .104 pin 2: 0
C8158 - pin 1: .104 pin 2: 0

Thanks Duke.

 

[dukefawks]

Diode mode can't be 0 of course.....what is going on there?

 

[Ryanlen2]

idk. you said both sides. Thats ground. no?

Sorry man. Im confused.

 

[dukefawks]

PCIE data line caps are C8020 and that whole bunch.....

 

[Ryanlen2]

ohhhh. Well that explains a lot. Sorry. To be honest I saw PCIE on pg 74 and thought thats what you were talking about.

 

[Ryanlen2]

C8020 - pin 1: .357 pin 2: .783
C8021 - pin 1: .355 pin 2: .785
C8022 - pin 1: .359 pin 2: .786
C8023 - pin 1: .354 pin 2: .786
C8024 - pin 1: .357 pin 2: .786
C8025 - pin 1: .352 pin 2: .786
C8026 - pin 1: .360 pin 2: .787
C8027 - pin 1: .351 pin 2: .787
C8028 - pin 1: .362 pin 2: .786
C8029 - pin 1: .357 pin 2: .786
C8030 - pin 1: .359 pin 2: .787
C8031 - pin 1: .352 pin 2: .787
C8032 - pin 1: .359 pin 2: .786
C8033 - pin 1: .357 pin 2: .787
C8034 - pin 1: .359 pin 2: .787
C8035 - pin 1: .350 pin 2: .787
C8055 - pin 1: .424 pin 2: .379
C8056 - pin 1: .424 pin 2: .385
C8057 - pin 1: .424 pin 2: .413
C8058 - pin 1: .423 pin 2: .410
C8059 - pin 1: .423 pin 2: .383
C8060 - pin 1: .423 pin 2: .410
C8061 - pin 1: .422 pin 2: .382
C8062 - pin 1: .423 pin 2: .382
C8063 - pin 1: .423 pin 2: .378
C8064 - pin 1: .423 pin 2: .384
C8065 - pin 1: .423 pin 2: .510
C8066 - pin 1: .423 pin 2: .384
C8067 - pin 1: .423 pin 2: .376
C8068 - pin 1: .423 pin 2: .381
C8069 - pin 1: .424 pin 2: 1.281
C8070 - pin 1: .424 pin 2: .384

Pin 2 of C8069 seems comparably off.

I changed C8069 and now I have pin 1: .426 pin 2: .402

Unfortunately this is one of the boards I put into the U.S. mostly working, and came out non working. Not chiming now. Working on getting it going again.

 

[Ryanlen2]

No CPU_VCORE after ultrasonic. FML.