Asus EEE PC 1015BX, brak reakcji na włącznik

Witam.
Płyta jak w temacie, BIOS zrobiony, podmieniony KBC, napięcia SUS 3.3V/5V obecne i poprawne, napięcie +12VSUS ma 13,94V, przetwornica (RT8206A) nie wystawia PGOOD.
NA KB3310QF brak SUSB_ON oraz SUSC_ON a także EC_PWROK. Sygnał EC_RST# cały czas jest w stanie wysokim. Brak niebezpiecznych rezystancji w tych liniach.
Niestety nie mogę znaleźć napięcia 3VS.

Posiłkuje się schematem do 1000HE.

Koledzy pomóżcie:)

Measure the voltages on pins 8, 17, 16, 13, 1, 6, 3, 7, 24 PU6012

If pin99 from KBC (VSUS_ON) stay on low level when you press power then check LID switch circuit.

On my PCB converter 3.3V/5V this RT8206A (in RT8206A pin 8 is N.C.)
In the scheme to the 1000HE is RT8205C (in this converter pin 8 is VREG3), so the pins do not match.
I wrote that scheme to 1000HE serves me only to help.

-- poniedziałek, 12 maja 2014, 14:29 --

Pin 99 is high, but when I press PBTN, the voltage on pin 99 for a split second drops to 2.2V and then back to 3.3V

So if enable signals are high there with VSUS 3.3V and 5V present and lack of VSUS_PWRGD signal then must be realtek ic damaged or KBC pin 117 with bad soldering or this diodes:

Did you checked the LID circuit (pin16 KBC)?

RT8206A is indicated PU6?
Measure the voltages on pins 1, 4, 6, 7, 10, 13, 14, 20, 27, 28, 30 PU6

The PCB does not have the numbering of elements (Asus), so I do not know what sign is this converter.


Voltage on RT8206A (this converter was swapped):
1 = 2V
4 = 18,79V
6 = 19,13V
7 = 5,06V
10 = 5,08V
13 = 24mV
14 = 3,32V
20 = 2,27V
27 = 3,32V
28 = 24mV
30 = 3,37V

I think the problem is with pull-up resistor from VSUS_PWRGD, in part schematics above is PR267...

-- Tuesday, 13 May 2014, 09:46 --

If the line VSUS_PWRGD is not short to gnd try to "force" pull-up to +3VA.

I handed yesterday with an external power supply to the PGOOD (3V), unfortunately it did not help.

Measure the resistance to ground of PL31

This is coil of 5VSUS - 146Ω.

-- wtorek, 13 maja 2014, 21:29 --

RT8206A - resistance on pin 13 and 28 (PGOOD) 9kΩ.
Pull-up resistor for line PGOOD - 100kΩ.
Voltage drop on the resistor pull-up - 3,29V.

This is coil of 5VSUS - 146Ω.

Low value. There is a short circuit.
Search short.
The resistance must be> 1K ohm

Although it is low resistance the voltage in the line is 5,09 V.
Trying to short-circuit, in line +5VSUS converter heats up - pulled out - resistance was the same.
Trying to short-circuit and nothing warms. PCB cold.

When I try to run, I noticed that for a split second, main voltage (+5VSUS and +3VSUS) falling at around 1,5 V - 2V.

Measure the voltage and resistance to ground on the
PQ626 pin 1-2-3
pin 1-2-3 PQ30

PQ626 (pin 1, 2, 3) - +5VS - 15kΩ
PQ30 (pin 1, 2, 3) - +3VS - 1,3kΩ

This is coil of 5VSUS - 146Ω.

Recheck this resistance to ground

Machine napisał(a):Cytuj:
This is coil of 5VSUS - 146Ω.

Recheck this resistance to ground

145,2Ω

It's a weird unusual fault...

indicheq napisał(a):When I try to run, I noticed that for a split second, main voltage (+5VSUS and +3VSUS) falling at around 1,5 V - 2V.

What about main voltage? Did this drop too?

unsolder PL31
Measure resistance to ground on the two pads
Indicate resistance to PU6 or to PCE3