Original Magsafe 2 charger 60/85W for sure???
Post U7501 basic voltages; 23, 12, 13, 22, 29, 21.
Post U7501 basic voltages; 23, 12, 13, 22, 29, 21.
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820-4924 problens
- Thread starter tlough75
- Start date
You've repaired it and learned a lesson too.
It is not waste of time, nor even for me.
It is not waste of time, nor even for me.
Post U770 voltages, 5, 18, 17, 15, 16, 11.
Also check diode mode to ground at both A/K pins of D7710; w/ and w/o LCD connected.
Also check diode mode to ground at both A/K pins of D7710; w/ and w/o LCD connected.
In the time you have 5V at pins 28-30/J8300, check if LCD_HPD_CONN and DP_INT_HPD go both high.
"Put some replacements from a donor and now we have fan spin and a ? folder."
Did you get image and backlight that time?
And now nothing at all?
"Put some replacements from a donor and now we have fan spin and a ? folder."
Did you get image and backlight that time?
And now nothing at all?
If these lines stay low, PCH cannot recognize LCD.
Try known good compatible LCD assembly.
Try known good compatible LCD assembly.
At least LCD_HPD_CONN should go high (2.5V), when you have 5V at J8300.
If not, bad video cable, or LCD panel.
Could also be a problem with LCD connector, if you already detected corrosion there.
Check all solders and traces...
If not, bad video cable, or LCD panel.
Could also be a problem with LCD connector, if you already detected corrosion there.
Check all solders and traces...
5V should come on for few seconds even if not LCD connected.
But it only remains on if PCH detects LCD.
That is only possible if DP_INT_HPD comes on; it requires 5V above mentioned.
But it only remains on if PCH detects LCD.
That is only possible if DP_INT_HPD comes on; it requires 5V above mentioned.
tlough75
Member
I fixed it!!!! don't know how I missed it, but the two vias for pin 1 (PPVOUT_S0_LCDBKLT) were broken. FIlled the one that was barely broken with solder and ran a wire for the other. oh boy what a troll this was. Now all I have to do is wait for new mic connector to come, run a new pad for that and this will be a fully working board.
"51.81V on pin 2 of D7710"
That was the sign; broken LED strips circuit...
That was the sign; broken LED strips circuit...