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Old 09-24-2014, 01:14 AM   #1
rippergr
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Default Toshiba c660D-16L power but doesnt boot

Hello
I have a toshiba c660D with LA-6849P motherboard.
When I plugged it on power the green light that has power lights but when I press the power button nothing happens.
I checked the power mosfets they have 19V.
I checked the chipset PU330(page 30) which has 3 & 5 volt
pin 16 VIN 19V
pin 8 VREG3 3,3V
pin 17 VREG5 5,08V
so I have voltage there.
Can someone tell me how to continue.

PS I couldnt test the power button. What should I short to test if it power on without the button?
Attached Images
File Type: jpg IMG_20140924_091757105[1].jpg (1.22 MB, 21 views)
File Type: jpg IMG_20140924_091810964[1].jpg (1.40 MB, 15 views)
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File Type: pdf compal_la-6849p_r1.0_schematics.pdf (531.5 KB, 58 views)
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Old 09-24-2014, 01:41 AM   #2
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Default Re: Toshiba c660D-16L power but doesnt boot

do u have 3,3v on switch?
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Old 09-24-2014, 01:49 AM   #3
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Default Re: Toshiba c660D-16L power but doesnt boot

Yes
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Old 09-24-2014, 02:11 AM   #4
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Default Re: Toshiba c660D-16L power but doesnt boot

Check PQ331 and PQ332 for short. They were getting really hot on mine. On another one I had the KBC controller was shorted.
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Old 09-24-2014, 06:03 AM   #5
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Default Re: Toshiba c660D-16L power but doesnt boot

Here are the readings
PQ 331
pin 5,6,7,8 19V
pin 1,2,3,4 3,3V

PQ332
pin 5,6,7,8 3,3V
pin 1,2,3,4 0V
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Old 09-24-2014, 06:15 AM   #6
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Default Re: Toshiba c660D-16L power but doesnt boot

Check PBTN_OUT# on pin 117 of KB926QFE0 on page 23. you should have 3v there if not first flash the bios with programmer and see what happens. If still nothing change KB926QFE0 with the new one.

P.S. First things first of course check the button itself and be sure it is ok. Sometimes just the button itself can be faulty even it looks like ok

Last edited by ahmetozay; 09-24-2014 at 06:16 AM..
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Old 09-24-2014, 06:36 AM   #7
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Default Re: Toshiba c660D-16L power but doesnt boot

Yes I have 3V there.
Can you tell me what to short to start laptop without the power button 1&3 , 1&4?
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Old 09-24-2014, 06:42 AM   #8
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Default Re: Toshiba c660D-16L power but doesnt boot

Quote:
Originally Posted by rippergr View Post
Yes I have 3V there.
Can you tell me what to short to start laptop without the power button 1&3 , 1&4?
put the probes on pins of the button then press the button and the voltage should goes to 0v if not change the button
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Old 09-24-2014, 10:00 AM   #9
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Default Re: Toshiba c660D-16L power but doesnt boot

It's a little difficult to measure it.
I attached 2 pictures to see how is the button.
There are no pins. How should I measure it?
Should I put -probe to ground and +ground to the first pin to see if the voltage goes to 0V?
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File Type: jpg IMG_20140924_183134741[1].jpg (939.6 KB, 11 views)
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Old 09-24-2014, 10:38 AM   #10
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Default Re: Toshiba c660D-16L power but doesnt boot

Quote:
Originally Posted by rippergr View Post
It's a little difficult to measure it.
I attached 2 pictures to see how is the button.
There are no pins. How should I measure it?
Should I put -probe to ground and +ground to the first pin to see if the voltage goes to 0V?
exactly like that. just black probe to the ground and red probe to the + side
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Old 09-24-2014, 11:08 AM   #11
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Default Re: Toshiba c660D-16L power but doesnt boot

Voltage doesnt change when I press the button it remains 3.3V.
I tried short pin 1 with 4 ( ON/OFFBTN# with GND) but still nothing.
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Old 09-24-2014, 12:37 PM   #12
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Default Re: Toshiba c660D-16L power but doesnt boot

flash bios. also check EC.
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Old 09-24-2014, 01:48 PM   #13
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Default Re: Toshiba c660D-16L power but doesnt boot

Can you tell me what do you mean EC? Where and how should I check it? Can I flash the bios without programmer?
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Old 09-24-2014, 02:26 PM   #14
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Default Re: Toshiba c660D-16L power but doesnt boot

Embedded Controller = EC (ite, winbond , etc..)
there are some ways to flash spi roms. google may help you on this.
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Old 09-25-2014, 12:19 AM   #15
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Default Re: Toshiba c660D-16L power but doesnt boot

Can you tell me which chip is EC. I think it is U22 but if this is EC how can I check it , there are no visible pins.

Last edited by rippergr; 09-25-2014 at 12:23 AM..
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Old 09-25-2014, 02:49 AM   #16
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Default Re: Toshiba c660D-16L power but doesnt boot

EC has pins. A lot of them. It's the ENE chip next to the RAM slots.
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Old 09-25-2014, 05:11 AM   #17
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Default Re: Toshiba c660D-16L power but doesnt boot

Thanks it's the U52 chip which I measure the 117 pin and I have 3V.
What pins should I check there?
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Old 04-13-2020, 04:59 AM   #18
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Default Re: Toshiba c660D-16L power but doesnt boot

Your laptop switched on without posting or totally dead?
If it is switching on , then you have problem with E-350 UMA VGA. You have to reball APU
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Old 04-13-2020, 05:31 AM   #19
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Default Re: Toshiba c660D-16L power but doesnt boot

Page 38 you have a gift : POWER SEQUENCE .
you find +3/5 VL , next step is EC ON ( pin 102 of U52 ) check it .

Also check +RTCVCC = D92
R1074 both sides
Q6 Drain and source

Last edited by lapfix; 04-13-2020 at 06:04 AM..
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Old 04-13-2020, 06:05 AM   #20
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Default Re: Toshiba c660D-16L power but doesnt boot

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