Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

[suleymanyasacan]

Hi. I have toshiba motherboard pt10sg dsc rev2.1
I have troubles with this board. When I press power button, power led on but fan not working and board wont boot. Also when I pressed power button too long, board does not turn off.
I check 19v is ok and 3.3v and 5.0v always power are good. Any idea where I check on board.
Thanks.

[Techtiger]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

Check rest of the Coils for Voltage’s RAM CPU ect & Resistance on all coils , test power button for 3.3V Cannot find the Schematic to help you, test have to check EC REST & RSMRST signs on SIO if no RAMRST you might have to FLASH Bios

[suleymanyasacan]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

Check rest of the Coils for Voltage’s RAM CPU ect & Resistance on all coils , test power button for 3.3V Cannot find the Schematic to help you, test have to check EC REST & RSMRST signs on SIO if no RAMRST you might have to FLASH Bios

Thank you techtiger. I have board schematic and I add it.
I will check other voltage and inform you.

[Techtiger]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

test U8100A
pin 12 3 7

test L8100 L8101 L8200 L8300 L8400 L8701 L8702 for ohm with out power multimetre in diode mode

test L8100 L8101 L8200 L8300 L8400 L8701 L8702 for voltage

jp8303 for voltage

U3001
pin 112 87 14 voltage

[suleymanyasacan]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

test U8100A
pin 12 3 7

test L8100 L8101 L8200 L8300 L8400 L8701 L8702 for ohm with out power multimetre in diode mode

test L8100 L8101 L8200 L8300 L8400 L8701 L8702 for voltage

jp8303 for voltage

U3001
pin 112 87 14 voltage

U8100A
pin 12 -> 19.5v
pin 3 -> 3.3v
pin7 -> 3.05v

ohm test without power
L8100 -> 410 ohm
L8101 -> 11 ohm
L8200 -> 8 ohm
L8300 -> 65 ohm
L8400 -> 340 ohm
L8701 -> 30 ohm
L8702 -> 30 ohm

voltage test
L8100 -> 5.15v
L8101 -> 3.3v
L8200 -> 0v
L8300 -> 0v
L8400 -> 0v
L8701 -> 0v
L8702 -> 0v

JP8303 -> 0v

U3001
pin 112 -> 3.3v
pin 87 -> 3.35v
pin 14 -> 3v

[Techtiger]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

L8101 -> 11 ohm
L8200 -> 8 ohm

you have only the standby voltages only for the moment SO state
L8101 11 ohms not so good remove CE8101 cap and test ohms L8101 again
replace that cap with a good one

L8200 8 ohms too low !

test D8101 pin 2 for 12VSUS

U3001
put red probe to pin 87 and black to GND press the power button and see 3.3v goes to 0V ,put red probe to pin 112 and black to GND press the power button and see 3.3v goes to 0Vand come back to 3.3V, U3001 pin 3 & 74 voltage ?
U3002 pin 8 & 3 Voltage ?
test D2001 pin 1 2 3 & pin 128 of U3001 for 3.3V RTCRST

[suleymanyasacan]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

you have only the standby voltages only for the moment SO state
L8101 11 ohms not so good remove CE8101 cap and test ohms L8101 again
replace that cap with a good one

L8200 8 ohms too low !

test D8101 pin 2 for 12VSUS

U3001
put red probe to pin 87 and black to GND press the power button and see 3.3v goes to 0V ,put red probe to pin 112 and black to GND press the power button and see 3.3v goes to 0Vand come back to 3.3V, U3001 pin 3 & 74 voltage ?
U3002 pin 8 & 3 Voltage ?
test D2001 pin 1 2 3 & pin 128 of U3001 for 3.3V RTCRST

Hi techtiger,
I check again L8101 and resistance is 360 ohm I guess it is normal even so ı remove CE8101 cap and check it is normal, no short circuit.

D8102
pin 2 -> 14.85v
pin 1 -> 10v
pin 3 -> 12v

U3001
pin 87 -> power adapter connected 3.35v. press power button voltage decrease 2.95v and again raise 3.35v
pin 112 -> 3.3v never change when press power button
pin 3 -> 3.3v never change when press power button
pin 74 -> 3.3v never change when press power button
pin 128 -> 0v

U3002
pin 8 -> 3.3v
pin 3 -> power adapter connected 3.3v. power button pressed 1.53v

D2001
pin 1 -> 3.3v
pin 2 -> 3.14v
pin 3 -> 3.23v

[Techtiger]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

In post#5 you have mention L8101 11 ohms if it's 360 ohm that's good for

U3001
pin 87# when you press the powerbtwn it should go to 0V and come back to 3.3V we are having to problem
pin 112# when you press the powerbtwn it should go to 0V and come back to 3.3V we are having to problem
test pin 125 U3001 for 3.3V this line is connected to powerSW test by pressing powerbtwn weather it goes to 3.3 to 0V & 3.3V

pin 128 0V can someone confirm this should be 3.3V ?
can you flash bios?
test JRST2001 JRST2002 R2002 3.3V

[suleymanyasacan]

Re: Toshiba c55 (pt10sg dsc rev2.1) noboot please HELP!!

I can flash bios . Any one have working bios please share.

JRST2001 -> 3.3v
JRST2002 -> 3.3v
R2002 ->0.25v

I check again u3001
pin 87 -> press power button 2.95v and raise 3.3v
pin 112 -> 3.3v never change
pin 125 -> 3.3v press powe switch goes 0v and raise again 3.3v
pin 128 -> 0v