Macbook A1932 Intermittent Backlight Issue 820-01521

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Ok - so this is your known good battery if it the battery charges to the full potential -> can report the # of charges / stats of the battery pack -> can operate without the external adapter (after it is charged) and power the laptop for a normal duration of use.

If the battery depletes quickly, etc. then the pack is weak and should be replaced.

It does not deplete that quick. It's normal. How to solve the No Image Issue?

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Hello Mon2 and Piernovv, the problem still persists randomly.
I have an observation here ! Closing the LID and re opening it will always ensure that an Image Appears. It may be for a 10 seconds or a couple of days but it appears. If there was an issue with the LID sensor then Music/Youtube will stop working but that doesn't happen. Laptop works with No Image.

When we close the LID the music stops. So the LID Sensor is working fine i believe.

[mon2]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Monitor the multiple power rails on the lcd connector when the display is working and when it is not.

The LCD works on other boards or you have tested others on this one?

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Monitor the multiple power rails on the lcd connector when the display is working and when it is not.

The LCD works on other boards or you have tested others on this one?

Do not have any other board to check.
Disconnected the Audio Board and it works well since the sensor is in the audio board. Now the display doesnot go blank and runs perfectly for hours. Do you think that the tiny board can be the issue?

[mon2]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

See numerous tantalum capacitors on the audio board. Check their resistance to ground.

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

See numerous tantalum capacitors on the audio board. Check their resistance to ground.

Getting .670 mostly.

The hall sensor seems to be in the Speaker connected to the Audio Board. Disconnected that and kept it under observation.

[mon2]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

What is the meter scale used for this resistance check ?

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

what is the meter scale used for this resistance check ?

pfa

[mon2]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Getting .670

Can you clarify the scale for this reading ?

0.67 ohms ?
670 ohms ?
670k ohms ?

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Can you clarify the scale for this reading ?

0.67 ohms ?
670 ohms ?
670k ohms ?

Using an Analog Meter Now.
Meter Set to 2K.

Resistance at Pin #1 of C0491 and C0492 is .562.
( Battery Disconnected. The Flex from main board to Audio Board Disconnected. Red probe on the ground)

Resistance at Pin #1 of C0491 and C0492 is .377
( Battery Disconnected. The Flex from main board to Audio Board connected. Red probe on the ground)

Resistance at Pin #1 of C0491 and C0492 is .377
( Battery Disconnected. The Flex from main board to Audio Board connected. Red probe on the ground)

Voltage at at Pin #1 of C0491 and C0492 is 12.65V (PPBUSG3H)

[mon2]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Ok. So 0.562 is 562 ohms, etc. Ppbus_g3h is a good voltage.

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Ok. So 0.562 is 562 ohms, etc. Ppbus_g3h is a good voltage.

Finally i have pulled out the speaker near the audio board and using it. The hall sensor is totally disabled.

Had sent it to Apple for a Diagnostics - their report suggest that the main board is at fault needs to be changed

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Ok. So 0.562 is 562 ohms, etc. Ppbus_g3h is a good voltage.

Turns out its the Logic board which is at fault. i have purchased the laptop from the client. need your help to fix this now !!

[Instafixx]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

Ok. So 0.562 is 562 ohms, etc. Ppbus_g3h is a good voltage.

Hello,
The device is still with me. Any suggestions as to what i should try and do?

[mon2]

Re: Macbook A1932 Intermittent Backlight Issue 820-01521

See attached. Press the referenced button on your meter till you are in the RESISTANCE scale. The omega / horse (ghoda) shoe symbol will be shown in the bottom right of the display.

Then post a picture again to confirm it.