Re: Toshiba L50-B-1R1 PSKT4E
Does anyone have dump for EC ROM (probably ST24C08)?
Gavran
Member
Last Activity: 12-01-2019, 06:36 AM
Joined: 01-27-2019
Location: Zagreb
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Re: Toshiba L50-B dead MBO
On this MBO i have one more ROM (U17) marked with 4G08 41223. It could be ST24C08, it's pins 5 and 6 are connected to KBC 67 68.
Is it the EC ROM? Anyone have dump for it?Last edited by Gavran; 01-30-2019, 03:52 AM.Leave a comment:
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Re: Toshiba L50-B dead MBO
I used this schematic for reference only : [url]https://www.badcaps.net/forum/showpost.php?p=763171&postcount=2[/url]
PCH is integrated on SoC.
RSMRST# is still 0V, after I bridged 3v3 to BIOS pin8.Re: Toshiba L50-B dead MBO<br /> <b... to BIOS pin8.Re: Toshiba L50-B dead MBO
I used this schematic for referenceLeave a comment:
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Re: Toshiba L50-B dead MBO
Bios pwr? isn't BIOS pwr rail, i got that wrong.
BIOS pwr rail comes from another mosfet and 3v3 SW rail (not LDO). Mosfet is OK, but no signal on gate. That signal should come from PCH_PWR_EN# according to some other schematics. I tried bridging the mosfet to get 3v3 on BIOS, now PCH heats less, but nothing else changed.
What are the odds that PCH or KBC failed?Leave a comment:
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Re: Toshiba L50-B-1R1 PSKT4E
Unconfirmed dump is OK.
I found a dump that worked for other people, and it is exactly the same as this one that i extracted.Leave a comment:
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Toshiba L50-B-1R1 PSKT4E
Hi,
I have problems with this laptop MBO (DA0BLIMB6F0 REV:F) and i need dump for it.
I tried flashing with extracted and truncated .fd file from Toshiba site, but MBO still isn't working. Maybe its HW problem so I would like to confirm this. Thread : [url]https://www.badcaps.net/forum/showthread.php?p=877688[/url]
Can someone tell if this extracted ROM is OK, or something must be added or replaced to it.
File named "backup_L50-B_1R1.bin" is dump from non working MBO, and file "unconfirmed_L50-B_1R1.bin" is truncated .fd file....Last edited by Gavran; 01-29-2019, 01:55 AM. -
Re: Toshiba L50-B dead MBO
I probed whole board for BIOS pwr rail, and I end up on single capacitor under the CPU.
Other components connected to it are some pullups and both gates on one 2N7002KDW-GP. 2N7002KDW-GP has 3v3 on both drains, and they are connected to KBC(67) and KBC(68).
Could it be that PCH is powering BIOS? Or this PCH only has pwr inputs? CPU is i7-4510U.Leave a comment:
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Re: Toshiba L50-B dead MBO
Taken off the heatsink, smaller die is heating up, larger die is cold.
Voltages on switcher ouputs (before pwr button press) are :
[url=https://ibb.co/QrDGvD5][/url]
Higher res : [url]https://ibb.co/QrDGvD5[/url]
After pwr button press, coil near the fan outputs 1.7v, others stay the same.
Q11 is marked with ADLV 14, don't know if its AO3404.
Board has no onboard battery for RTC, so it might be powered via main battery.Re: Toshiba L50-B dead MBO
Taken off the...Last edited by Gavran; 01-28-2019, 11:32 AM.Leave a comment:
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Re: Toshiba L50-B dead MBO
Mosfet is controlling power to BIOS, but that power rail isn't connected to RT6575A 3v3 LDO rail, no continuity to it.Leave a comment:
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Re: Toshiba L50-B dead MBO
[url=https://ibb.co/PcRz05Z][/url] [url=https://ibb.co/WHQvTdY][/url] [url=https://ibb.co/k8PfnCy][/url] [url=https://ibb.co/Hd9sMGn][/url] [url=https://ibb.co/x5kKg4D][/url]
Higher res:
https://ibb.co/PcRz05Z
https://ibb.co/WHQvTdY
https://ibb.co/k8PfnCy
https://ibb.co/Hd9sMGn
https://ibb.co/x5kKg4DRe: Toshiba L50-B dead MBO
[url=https://ibb.co/PcRz05Z][/url] [url=https://ibb.co/WHQvTdY][/url] [url=https://ibb.co/k8PfnCy][/url] [url=https://ibb.co/Hd9sMGn][/url] [url=https://ibb.co/x5kKg4D][/url]...Last edited by Gavran; 01-28-2019, 08:47 AM.Leave a comment:
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Re: Toshiba L50-B dead MBO
BIOS chip is GD25Q64B, it is 3v3.
Are you sure it is powered via RT6575A 3v3 LDO? Cause it has no continuity from mosfet to RT6575A. I will post some photos soon.Leave a comment:
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Re: Toshiba L50-B dead MBO
I don't have a schematic. I traced transistor that turns on 3v3 for BIOS, but it has same 0.7v on drain, and 1.2v on gate. I wasn't able to trace where that 0.7v comes from cause it is lost on some mid layers.
Do you know where is BIOS pwr generated on this MBO?
I flashed BIOS ROM with Raspberry PI and flashrom tool. ROM was extracted from .fd file downloaded from toshiba site. I just truncated headers in .fd file to get 8MB .bin file. Don't know if it is a valid way of doing, or i should prepare the dump before flashing.Last edited by Gavran; 01-28-2019, 05:02 AM.Leave a comment:
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Toshiba L50-B dead MBO
Laptop: Toshiba L50-B-1R1, MBO DA0BLIMB6F0 REV:F
Problem: If I plug in AC and/or battery laptops starts by itself, fan starts spinning for about 5 seconds than stops, Num, Caps, Pwr and wifi leds are illuminated. CPU is overheating by just sitting there. Screen is blank and no backlight, no beeps, laptop can't be turned off. Wifi led can be turned off by Fn+F12 but Caps and Num can't. Problem appeared "by itself", one day it was working, next morning this.
Diagnosis: Tried normal procedures (draining residual power, resetting by G2 jumper, BIOS reflash via... -
Re: toshiba satellite c55-b
Hi, I have similar problem with Toshiba L50-B-1R1.
When i plug in AC or battery fans starts spinning for few seconds then stops, but all lights stay on (pwr, num, caps, wlan). WLAN light can be turned off via Fn+F12 but caps and num can't.
Voltages from RT6575A before PWR button press are 3V3 on both 3V3 outputs, and 5V on both 5V outputs.
After PWR press DNBSWON# switches from 0V to 2.6V, but nothing changes.
BIOS IC (U18) has 0.7V on pin8, before and after PWR button press.
Tried reflashing BIOS with extracted ROM...Leave a comment:
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