A1706 820-00239-A 300MA TO 400MA No Display No backlight.

TBFix

Member
I have one of these with flexgates powers up fine. I repaired cable and reassembled . Now it only gets to 200ma - 300ma , cpu gets warm no chime . touchpad vibrates but keyboard light does not come on. I have removed the backlight cable but still the same. I also tried test screen but still same.
Any help appreciated.
 

2informaticos

Administrator
Staff member
Inspect board for knocked off components, or broken trace.
Test it alone on the desk; check CPU voltage.
 

TBFix

Member
I got the current to come back to 800ma then it drops 700ma/400ma black screen, chime can be heard. I tried with other screens still the same.
l7220/210 = 612mv
l7410 = 0v
l7430/420 = 0v
l7270 = 890mv
 

2informaticos

Administrator
Staff member
Check if 3V3/5V_S0SW_LCD come high in the first seconds at least (when chime).
If yes, DP_INT_HPD must go high at same time.
If not, check diode mode to ground on EDP_INT_ lines; w/ and w/o internal LCD connected.
 

TBFix

Member
With screen connected 3V3/5V_S0SW_LCD go high briefly but DP_INT_HPD does not .
 
Last edited:

2informaticos

Administrator
Staff member
"If not, check diode mode to ground on EDP_INT_ lines; w/ and w/o internal LCD connected."
???

Seems that LCD, or video cable issue; internal LCD isn't detected.
Did you change the small video cable?
 

TBFix

Member
Apologies mean to say that EDP_INT_AUX_N is open when measured diode mode but EDP_INT_AUX_P has .170 on diode mode. I changed the lcd cable and screen. Looks like CPU ?.
 
Top