820-4924-a green/orange and dead...

[yair37]

no liquid damage, suddnly no power on....there is green then orange, on SMC bypass fan on full power but nothing else.

ppbus_g3h - 12.50V
PP3V42_G3H - 3.3V
PPVRTC_G3H - 3.3V
PP5V_S5 - 5.1v
PP5V_S3 - 5.1V
PP5V_S0 - 5.1V
SMC_LID - 3.4V
PP3V3_S5 - 3.3V

 

[2informaticos]

So you get S3 and S0 voltages in normal mode?
That means board powers on; non function is different thing!
Or you only get 5V_S3/0???

Do not expext fan spins; only when CPU gets really hot.

 

[yair37]

Yes all voltage presents in normal mode just board with charger.
PP5V_S0 - 5v just after few seconds.
PP5V_S3 - i sew one's that it was jumping from 0v to 5v up and down...but now is stable. I was try to turn it on with ON/OFF from the board but nothing....i was waiting few minutes to see if the fan start but nothing.....wierd.

 

[yair37]

i was connected now the board back to the body with all connectors...i was bypass SMC fan start (low speed) 3s on and off

 

[2informaticos]

Do you get stable VCORE?
Did you check for USB activity?

 

[yair37]

PPVCC_S0_CPU -0v short
no USB activity

 

[2informaticos]

Short for sure???
There is low value as normal.

Board stays on in normal mode?
If yes, post voltage on big coils, apart of CPU ones.

 

[yair37]

yes full short...015

"Board stays on in normal mode?"
please explain

 

[2informaticos]

0.015 in diode mode means short in VCORE???

I didn't understand if board stays on, or goes off completely.
On is not the same as working board.
If you get S3 voltages, board is already on...

 

[yair37]

?????

Its stay ON...all s3 voltage are presents..

 

[yair37]

Where should I look next?

 

[2informaticos]

Now check all S0 voltages.
In fact, look at pages 61/63.

 

[2click]

Hi, I'm sorry to post here, but I can?t find how to make a new post, I'm a new user of the forum. So I have this same mother board 820-4924-A. It has no backlight, I have no voltage on enable pin on U7700.
EDP_BKLT_PSR_EN = 0 volts, no short to ground according to me.
EDP_BKLT_EN = 0 v
LCD_PSR_EN = 0 v
EDP_PANEL_PWR = 0 v
what can I try?
Thanks in advance!

 

[2informaticos]

Welcome to the forum!

Please read the note on top of the forum, about user and PayPal email account.
Write a meesage to forum staff, or directly to Louis, if still problems.
Mixing board issues in the same thread doesn't help...

Looks like missing image too.
So no reason to search for backlight yet.

 

[2click]

Sorry about that, I?ve alredy sent them messages and my user and paypal are the same... they?re working on it. Can you please create a post where you can help me with thay mb? It does have image tough. If I use a flashlight I can see the apple on the display...

 

[2informaticos]

Can you see the red circled "+ New Topic" button on your browser?

 

[2click]

This is what I get...

 

[2informaticos]

Scroll down and check this too...

 

[2informaticos]

If still encounter problems, use new thread which I just open for you...

 

[yair37]

PP3V3_S0 - 3.2v
PP1V05_S0 - 1.1v
PP5V_S0 - 5.1v
P1V5S0_PGOOD - 0v no short
P1V5S0_EN - 3.2v
P3V3S0_EN - 3.3v
PP3V3_S0_FET 3.2v
P1V05S0_EN - 3.3v
PPVOUT_S0_LCDBKLT playing from 12.2v to 0v maybe becouse screen is not connected?
SMBUS_SMC_0_S0_SCL - 0v
PP3V3_S0_EDP_SW - 0v (r5351)
PPVIN_S0SW_LCDBKLT - 0v
PP5V_S0_BKLT - 5.1v
PP5V_S0_BKLT_D - 5.1v
PPVIN_S0SW_LCDBKLT_F - 12.5v
PP1V5_S0 - 2.8v too high?
P1V5_S0_FB - 1.5v
P1V5_S0_FB - 2.6v too high?
P1V5S0SW_AUDIO_EN - 0v no short
PP1V5_S0SW_AUDIO_HDA - 2.6v too high?


i know there is few that no need but i put it anyway, did i forgut somthing?