ACER D257 -ZE6 NO DISPLAY COMMON PROBLEM
Posted: Thu Nov 17, 2016 10:20 am
TYPE : ACER ASPIRE ONE D257
CHASIS : ZE6
SYMTOM : NO DISPLAY ON 0.35A
[hidden]chencking process :
1.Check around PU1 (RT8207A) .Because this area touch foam on case..in long therm if the foam get moist can make corrosion around PU1.
2.After visual checking found PR30 / 680K corrosion.replace this resistor , test motherboard... and laptop work fine
3.So.. why if PR30 damage-corrosion can make motherboard no display with 0.35A? if PR30 Damage - corrosion... output of PU1 1.5VSUS is still generate...but 1.5VSUS PGOOD not generate.so Hardstart on power squence stoped,Reset signal on the next step not occur and ampere meter stuck on 0.35A. no display accour.so main problem is missing 1.5 VSUS_PGOOD signal to complete power squence.
4.Clean all moist foam arround pu1 before assembly thelaptop ,Thanks[/hidden]
CHASIS : ZE6
SYMTOM : NO DISPLAY ON 0.35A
[hidden]chencking process :
1.Check around PU1 (RT8207A) .Because this area touch foam on case..in long therm if the foam get moist can make corrosion around PU1.
2.After visual checking found PR30 / 680K corrosion.replace this resistor , test motherboard... and laptop work fine
3.So.. why if PR30 damage-corrosion can make motherboard no display with 0.35A? if PR30 Damage - corrosion... output of PU1 1.5VSUS is still generate...but 1.5VSUS PGOOD not generate.so Hardstart on power squence stoped,Reset signal on the next step not occur and ampere meter stuck on 0.35A. no display accour.so main problem is missing 1.5 VSUS_PGOOD signal to complete power squence.
4.Clean all moist foam arround pu1 before assembly thelaptop ,Thanks
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