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820-3462 no backlight
- Thread starter bartech
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Do you get image for sure?
Else, no reason to search for backlight.
Check at least if voltage appears at pins 28-30 iof J9000.
Did you try known good (compatible) LCD assembly?
BTW, no need to post boardview screenshot, once you post component voltages.
Else, no reason to search for backlight.
Check at least if voltage appears at pins 28-30 iof J9000.
Did you try known good (compatible) LCD assembly?
BTW, no need to post boardview screenshot, once you post component voltages.
Post BKLT_EN and LVDS_BKL_PWM_R voltage.
Now check LCD_BKLT_EN and BKLT_PLT_RST_L.
"0V on J9000 28-30"
I didn't read that; impossible to get image in such condition.
Please re-check...
I didn't read that; impossible to get image in such condition.
Please re-check...
"5v but only in few seconds at the start"
LCD_HPD must go high at same time.
If not, PCH cannot detect the screen.
"there is apple logo"
You can't get image without the mentioned voltage!
LCD_HPD must go high at same time.
If not, PCH cannot detect the screen.
"there is apple logo"
You can't get image without the mentioned voltage!
With Apple logo, do you mean the light on top cover?
In such case, backlight is present.
Post C9719 voltage, with LCD connected.
In such case, backlight is present.
Post C9719 voltage, with LCD connected.
"there is apple logo"
Explain this, please?
Was image on LCD, or the logo on top cover?
Explain this, please?
Was image on LCD, or the logo on top cover?
Check the traces between U/Q/D9701 and L9710.
Also check R9708/09, R9717-22 and their traces.
Be sure D9701 is not shorted.
Also check R9708/09, R9717-22 and their traces.
Be sure D9701 is not shorted.
Looked, or checked with multimeter???