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820-2936 - Works but

larossmann

larossmann

Administrator
Staff member
What you say you have and the actual measurements you have conflict with each other to the point where I don't believe any of your measurements. They are either mistyped, from the wrong point, or something. Are you removing the LCD to take your measurements or something?

I would ask you to measure voltage at pins 2/3 of the LCD connector but if you are saying you have 12v with backlight at backlight output I Can't trust your measurements and this is pointless.

First you need 3.3v at pins 2/3 of the LCD connector.

Then you need a known working LCD & LCD cable

Then you need L9080 to be good. Try a different L9080 and make sure it is soldered properly.

I have no idea what to suggest for this case if you are providing wrong measurements. We really base our support on what you tell us, and if what you tell us is not physically/electrically possible, there's not much we can do to help you.
 
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dukefawks

Administrator
Your measurements do not reflect a working backlight, but whatever backlight is working.

The issue now is a black screen with backlight and that is usually an LVDS issue. As I asked before measure all LVDS lines on diode mode and post values. Pin 8,9,11,12,14,15,17,18. This is with the board OFF and LCD UNPLUGGED!
 
larossmann

larossmann

Administrator
Staff member
With charger plugged in, measure voltage at these points:
R6990, pin 1
R6990, pin 2
D6990, pin 3

It is VERY IMPORTANT that you figure out how to provide real measurements. When you were measuring 12v at pin 22 of the LCD connector, but saying it had backlight, do understand we are not trying to insult you by saying that measurement is bullshit. It is just fact - it is like saying I get 2v on my incandescent lightbulb socket but I see a light.. it is not possible.

Once you have sorted out taking voltage measurements with the mater, tell us what you get there.
 
larossmann

larossmann

Administrator
Staff member
Do you get that 16v on pin 1 of R6995?
Is R6995 measuring 1 mohm?
Do you have 16v on pin 4 of U6990?

What is resistance to ground on pin 1 and pin 2 of L6995?
 
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dukefawks

Administrator
Measurements don't make sense. You say you have 3.42V on battery but not on AC. You have voltage after D6990 so this means you MUST have 3.42V on AC too.
 
menatwork

menatwork

New member
R6995 - Pin 1 = 16.54v
U6990 - Pin 4 = 16.54v

Resistence to ground:
L6995 - Pin 1 = 15.87kΩ
L6995 - Pin 2 = 15.87kΩ
 
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dukefawks

Administrator
Quote:
Right now i don't have 3.42v and green light from the charge.
If i plug the battery, i get 3.42v

The amount of contradictory information you provide makes diagnosis impossible.
 
menatwork

menatwork

New member
Yes, you are right.
Forget about battery (wrong post) and try help me figure out the problem with my board, please.

I get this for louis:

R6995 - Pin 1 = 16.54v
U6990 - Pin 4 = 16.54v

Resistence to ground:
L6995 - Pin 1 = 15.87kΩ
L6995 - Pin 2 = 15.87kΩ
 
menatwork

menatwork

New member
5 days ago
R6995 - Pin 1 = 16.54v
U6990 - Pin 4 = 16.54v

Resistence to ground:
L6995 - Pin 1 = 15.87kΩ
L6995 - Pin 2 = 15.87kΩ
 
larossmann

larossmann

Administrator
Staff member
Your measurements indicate you have PP3V42_G3H. What has happened inbetween you having no image and it being dead?

Is PPBUS_G3H present and if so is it 12.55v or 12.22v? PP5V_S5? PPVRTC_G3H? PP5V_S3? PP3V3_S5? Is SMC_RESET_L present? Is SMC_BC_ACOK present?

I honestly doubt this will be solvable from all the confusing measurements provided.
 
menatwork

menatwork

New member
larossmann Yes, before i get PP3V42_G3H and i just have problem with no image.
So i decide to put the board on supersonic machine and after that i don't get more PP3V42_G3H.

Right know i dont have PP3V42_G3H (no greenlight)
 
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