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A2338 820-02773 5V PPBUS at 11V

Instafixx

Instafixx

Active member
PPBUS at 11V pulsing between 11V and 12V.

PP3V8_AON is 3.8V

Unable to enter DFU with key combinations.
Jumper method wont work as S2 lines have 0.3 to 0.5V.

PP5v_S2 is 2.3V and pulsing
3v3_s2_LDP is 1.3V

Bad CD3217?
 
Instafixx

Instafixx

Active member
Did a thermal scan. UE501 was heating up. SMC_FAN line shorted. Replaced UE501 - short gone.
UP701 was burst. Replaced. Had to reconstruct a trace as well. But its still the same.

Did thermal scanning again now UP710 heating up.
 
Instafixx

Instafixx

Active member
All findings are with board on desk.

Currently 3v3_s2_WLBT_ISNS is shorted. Injected voltage. IC suspected
 
Instafixx

Instafixx

Active member
Removed the WIFI IC. Short gone. Machine boots now. I get chime and external video but no internal image or backlight .
NO IMAGE and NO BACKLIGHT.

UP701 was burnt and was replaced . I had to reconstruct trace for EDP_PANEL_PWR_EN.
I get 3.3V there very briefly before it goes down to 0V.

Tried known good display as well.
 
2informaticos

2informaticos

Administrator
Staff member
"I get 3.3V there very briefly before it goes down to 0V"
Can you catch 3V3/5V_SW_LCD at same time?
 
2informaticos

2informaticos

Administrator
Staff member
3V3_Sw_LCD should pulse at same time with EDP_PANEL_PWR_EN.

Maybe I understood you wrong.
"I get 3.3V there very briefly before it goes down to 0V"
Was this reference about EDP_PANEL_PWR_EN?
 
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