MiTAC 8355 service manual No power

8355 N/B MAINTENANCE

8.1 No Power:

When the power button is pressed, nothing happens ,power indicator does not light up.

No power

Is the

Notebook connected

to power (Either AC adaptor

or battery)?

Yes

Try another known good battery or AC adapter.

No	Connect
	AC adaptor
	or battery

Board-level

Troubleshooting

		Check following parts and signals:
		PARTS:				SIGNAL:
Where	AC	PJ501	PC501	PU504	F503	ADINP
From Power Source		PF1	PQ1-5	H8	U508	D/VMAIN
Problem(First use		PL1	PQ10	PR29	D22	VDD5S
AC to power it)		PL2	PQ11	PR30	D24	ADEN#
		PL3	PR1-7	PC64	Q32	LEARNING
		PC10	PD1	PC65	Q513	+VMAIN_2951
		PC20	PD3	PR538	Q517	VDD5_SW
		PD4	PD5	PR539	R220	VDD5_SW#
		PU501	PR9	PC29	C314	I_DISCHG
		PR501	PR10	PC567	C322	I_CHG

Power	Yes	Replace the faulty
OK?		AC adaptor , or
		Battery.
No

Replace

Motherboard

Check following parts and signals:

	PARTS:		SIGNAL:
Battery	PJ502	PU504	D/VMAIN
	PF502	PU10	BAT_V
	PC551	PR41-44	BAT_T
	PL7-9	PQ15	BAT_C
	PC63	PC79	BAT_D
	PR534	PC76	BATT_DEAD
	PR533	PR546
	PC543	PR547
	H8	PC553
	PR565	PR65
	PR566

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