Put DC supply amp. 144 - 160 ( means core not generate)
Open this laptop
Check my basic points
Check all coil impidence 🆗
Check all coil voltages
Vin section 👍✅
3v, 5v coil voltage 🆗
Ram voltage 👌
3v , 5v conversion ✅
1.8 v 👍
Check 1.05 v pch coil (❌) not generate
Open schamatic and trace
1.05 v ic requirment check
Power -5v ✅
Enable- missing
This board design by wistron
I know,
1.05v enble signal coming
Ram supply power good + 1.8v section power good
After mixed both power good
Known as ,
RUN POWER OK
RUN POWER OK supply goes 1.05v enable signal
I check then found ram ic power good not generate
👉 I see this path 3.3v pull up resistor(PR5004)
One side voltage okk but other side no voltage
Checking purpose shot this resister
My board is on
After this,
I chage resister 0 ohm
My board is proper on & give display
