DABLIDMB8E0 REV E won't turn on

[angel611]

have the same trouble with 2 motherboard, led white without battery and red light with battery but the notebook won't turn on and i check the motherboard i noticed the same caps on 2 motherboard burn, without this cap no led and after replace, same issue white led or red led whit battery, any help?

[on/off]

Re: DABLIDMB8E0 REV E won't turn on

It wasn't a Caps but Resistor marked by label R391 with value 0 ohm. The shape indeed make us confuse (maybe small ferrite coil). I believe it connected to 3V_S5 rails, but the question is could be those rails goes to the load for SoC (CPU+CHIPSET). we don't know yet. Possibly the SoC have shorted.

The first time I face with this mobo, R391 not totally burn but found it abnormal heat. at least got few data maybe can help for future.

+5VPCU
=======
PQ11 D
PQ8 D
=======
+3VPCU
PQ10 D
PQ9 D
=================================
PQ9 S 3V
PQ10 S 3V_S5
=================================
PQ8 S 5V
PQ11 S 5V_5


PQ11 G pin3 ao6402
PQ10 G pin3 ao6402
PQ2 D
PQ2 G ===== D PQ1
PQ1 GATE S5_ON
==================================
PQ8 G ===== D PQ3
PQ9 G ===== D PQ3



==================================
pin8 RT6575
pin19 KBC
1256 PQ10 ao6402

==================================


pin18 RT6575
1256 PQ11 ao6402

==================================
Jumper pad (RTC_RST# AND SRTC_RST#)
G1 ===== R142
G3 ===== R150 ?


==================================

Q11 G (AO3413) ===== Q10 D
R122=100K
==================================
PQ10 S ===== R391
R391 (0) ===== R394 (10K)===== DNBSWON

check this link:
http://*******/viewtopic.php?f=54&t=44108
https://www.elvikom.pl/toshiba-l50-b...ja-t45158.html

[angel611]

Re: DABLIDMB8E0 REV E won't turn on

sorry for my ignorance, but what is KBC in this motherboard?

[mcplslg123]

Re: DABLIDMB8E0 REV E won't turn on

sorry for my ignorance, but what is KBC in this motherboard?

kbc in this mobo id 128pin chip marked NUVOTON.

[mirjana]

Re: DABLIDMB8E0 REV E won't turn on

I have the same problem. Any solutions?

[balobi]

Re: DABLIDMB8E0 REV E won't turn on

i have same issue here with white light but when you press power button it won't turn on.

[ktmmotocross]

Re: DABLIDMB8E0 REV E won't turn on

It wasn't a Caps but Resistor marked by label R391 with value 0 ohm. The shape indeed make us confuse (maybe small ferrite coil). I believe it connected to 3V_S5 rails, but the question is could be those rails goes to the load for SoC (CPU+CHIPSET). we don't know yet. Possibly the SoC have shorted.

The first time I face with this mobo, R391 not totally burn but found it abnormal heat. at least got few data maybe can help for future.



check this link:
http://********/viewtopic.php?f=54&t=44108
https://www.elvikom.pl/toshiba-l50-b...ja-t45158.html

Yes it was resistor and he replaced it with capacitor

[ktmmotocross]

Re: DABLIDMB8E0 REV E won't turn on

i have same issue here with white light but when you press power button it won't turn on.

check all coils for short, voltage and voltage when start

[Am0rPHiA]

Re: DABLIDMB8E0 REV E won't turn on

same problem here, any ideas?

[Sametbey]

Re: DABLIDMB8E0 REV E won't turn on

have the same trouble with 2 motherboard, led white without battery and red light with battery but the notebook won't turn on and i check the motherboard i noticed the same caps on 2 motherboard burn, without this cap no led and after replace, same issue white led or red led whit battery, any help?

plugging this coil into the touch socket of the HP socket causes the processor to burn out.

[Nen_11]

Re: DABLIDMB8E0 REV E won't turn on

did you solve it?

[Vspeed]

Re: DABLIDMB8E0 REV E won't turn on

I had the same board with the same issue. I can also say how it's caused, I caused it to a perfectly perfect working computer.

The problem is caused by plugging the speaker connector in a nearby socket (cn18) that has the same pin count as the speaker one but it's actually for plugging the screen backlight connector for maybe a different model screen. Toshiba left this connector on the board but without anything connected.
When connecting the speakers to it, you will burn the CPU integrated intel graphics card and also that resistor and maybe something more. I'm now trying to figure that out.

Here is what I did till now.

Replaced that resistor with a new one.
Replaced the original CPU i7-4500u with a i7-4510u (not sure if I need to edit the bios somehow for it to boot with the new CPU)
The PC now powers up and stays on, it has fan spin for 5s, but there is no picture. Not in the laptop screen and also nothing via HDMI.

Any hints»

[Stevedb]

Re: DABLIDMB8E0 REV E won't turn on

Does the capslock react on external keyboard?

[Vspeed]

Re: DABLIDMB8E0 REV E won't turn on

Can't test it now

Just lost one component last night to the 5th dimention. Took it out to check if it was bad or not, and just lost it. I know it's responsible to convert 12v to 3v or 3.3v... It's not turning on now.
It's PQ10

Anyone knows it's reference?
if not, I just ordered another broken board to have some components to replace

edit: just found it's a ao6402. it's actually some posts above and the schematics that are not exactly for this model, point to the same component

[reformatt]

Re: DABLIDMB8E0 REV E won't turn on

How is no display “perfectly perfect”?

[Vspeed]

Re: DABLIDMB8E0 REV E won't turn on

Maybe I was not clear.
The laptop was working fine. I took it apart to replace the hinges and though of taking the board out to give it a clean. The problem was caused by me when assembling it back as I plugged the speakers in the connector for the LCD backlight. The laptop had no power after this and the CPU/intergrated GPU was in short. Also the resistor marked R391 responsible to provide 3V to the CPU and maybe something else was burned.
Replaced the resistor and the CPU with i7-4510u

Anyway, I found the AO6402A that was in the 5th dimension and
just executed the ME cleaup procedure and have the same behavior

5s fan spin
it stays on until I keep the power button pressed for some seconds
The CPU and dedicated GPU heat up

edit: the fan just kicked in after 1m. so, it's at least detecting it's getting hot.
could the dedicated GPU be dead somehow and this is what is causing no picture? I don't measure any short in it and it's getting 1V

[Vspeed]

Re: DABLIDMB8E0 REV E won't turn on

just to update this topic.
The laptop is again working fine after replacing the CPU i7-4500U with i7-4510U, replacing PQ10 (AO6402A) and the R391 (0ohm) and doing ME cleaning (https://www.badcaps.net/forum/showpo...41&postcount=3)
My mistake was I was using a DDR3 memory module instead of a DDR3L. The laptop is booting fine and maybe it was even without cleaning the ME.