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Macbook A2442 (820-02098) No Display
- Thread starter Instafixx
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Do you get correct voltage on JP600's power lines?
LPDP_INT_HPD comes high?
Check diode mode to ground on LPDP_DATA/AUX lines.
LPDP_INT_HPD comes high?
Check diode mode to ground on LPDP_DATA/AUX lines.
Instafixx
Member
Bare Board on Bench.
LPDP_INT_HPD is pulsing from 0V to 0.7V
Diode Mode to Ground.
LPDP_INT_HPD is .329
LPDP_DATA/AUX lines are all Ground as per the schematics i have. Please reconfirm.
A few which are not Ground like LPDP_INT_AUX_C_N and adjacent are .385
LPDP_INT_HPD is pulsing from 0V to 0.7V
Diode Mode to Ground.
LPDP_INT_HPD is .329
LPDP_DATA/AUX lines are all Ground as per the schematics i have. Please reconfirm.
A few which are not Ground like LPDP_INT_AUX_C_N and adjacent are .385
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"LPDP_DATA/AUX lines are all Ground"
I don't understand what you've meant.
Did you even check them in diode mode?
No need to connect LCD for diode mode readings.
But no reason at all to check voltages without LCD connected!
I don't understand what you've meant.
Did you even check them in diode mode?
No need to connect LCD for diode mode readings.
But no reason at all to check voltages without LCD connected!
No readings in diode mode should be OL (Open Line).
And that is normal, as each line has serie capacitor for separation; but not grounded, as you've said.
What about mentioned power lines voltage?
And that is normal, as each line has serie capacitor for separation; but not grounded, as you've said.
What about mentioned power lines voltage?
Instafixx
Member
Hi , i noticed one thing today.
With Battery connected the AMP Meter is at 20V and the machine turns on and i get external display.
With Battery Disconnected the AMP Meter is Cycling. It goes upto 20V stays there for 4-6 seconds and then reboots on all 3 USB C Ports. (96W Adapter)
Is it a power issue ?
With Battery connected the AMP Meter is at 20V and the machine turns on and i get external display.
With Battery Disconnected the AMP Meter is Cycling. It goes upto 20V stays there for 4-6 seconds and then reboots on all 3 USB C Ports. (96W Adapter)
Is it a power issue ?
Then you have power input problems (USB-C, or Magsafe 3), apart of internal video issue.
Did you test with Magsafe 3 too?
Check UPC_I2C_INT_L behavior?
Check UPC_I2C_INT_L behavior?
Low voltage denotes a problem with one CD3217 chip connected there.
May be not the chip itself, but its corresponding port.
May be not the chip itself, but its corresponding port.
For the internal video problem, you must check JP600's power rails with battery connected; not when power cycling.
Internal LCD must also be connected.
So must check pins 4, 32, 34 and 37/38.
Find proper test points, as you can't reach the pins with LCD connected.
Internal LCD must also be connected.
So must check pins 4, 32, 34 and 37/38.
Find proper test points, as you can't reach the pins with LCD connected.
Can you put the machine in DFU?
USB-C ports still cycling then?
USB-C ports still cycling then?
Still power cycling in normal mode, after done revive?
Test that with internal LCD disconnected also.
Test that with internal LCD disconnected also.