Toshiba L650 power problem

[Lykos]

Greeting to everyone!
I have a Toshiba L650 that works perfectly good on battery, but does neither charge nor work on external power. I have attached the schematic of the power supply part of the board, so I cut to the chase.
After some experiments I probably destroyed the charging chip (MAX17435ETG+) but it still works the same (even with the IC removed).

I get 19v to the Drain of Q6002 (with adapter on but battery removed) but only 3v on the Source and nothing to the gate (same as before destroying the IC).
With battery on, I get 12v on the source (probably because it's connected with Q6005 Source) and I have already replaced it althought it measured normal (just multimeter).

The question might sound stupid after all this intro...
I want to make the laptop work on the adapter. If I remove U6000 (the destroyed MAX17435ETG+), Q6002 and Q6005 and then short Q6002's source and drain, will it work without frying anything?

Thanks in advance!

[fddizon]

Re: Toshiba L650 power problem

Lykos,

see this thread

https://www.badcaps.net/forum/showthread.php?t=8991

replace the destroyed chip and proceed with the threads solution

regards

[Lykos]

Re: Toshiba L650 power problem

I have read this post, in fact, I have replaced a couple of proadlizers with capacitors successfuly, but it is irrelevant with my question.

[lord]

Re: Toshiba L650 power problem

Greeting to everyone!
I have a Toshiba L650 that works perfectly good on battery, but does neither charge nor work on external power. I have attached the schematic of the power supply part of the board, so I cut to the chase.
After some experiments I probably destroyed the charging chip (MAX17435ETG+) but it still works the same (even with the IC removed).

I get 19v to the Drain of Q6002 (with adapter on but battery removed) but only 3v on the Source and nothing to the gate (same as before destroying the IC).
With battery on, I get 12v on the source (probably because it's connected with Q6005 Source) and I have already replaced it althought it measured normal (just multimeter).

The question might sound stupid after all this intro...
I want to make the laptop work on the adapter. If I remove U6000 (the destroyed MAX17435ETG+), Q6002 and Q6005 and then short Q6002's source and drain, will it work without frying anything?

Thanks in advance!

I never tryed it, but it should work. However do it at your own responsibility!

[Lykos]

Re: Toshiba L650 power problem

At the end it didn't work. I'm still trying to figure out a way to make this thing usable again.
Thanks for your answers!

[lord]

Re: Toshiba L650 power problem

Did you try to replace the U6000? Did you test MOSFETs Q6000, Q6001, Q6002 and Q6005? Test D6000 and try to bridge D6005.

[dycc]

Re: Toshiba L650 power problem

it will work fine . but don't use adapter and battery at the same time

[laurentd]

Re: Toshiba L650 power problem

Hello,

My Toshiba L655 has been the same problem (not battery charging).

After replacement of the U6000 (MAX17435) the problem is fixed
I found the fault by measurement of the ref value of the U6000.
The output was at 0V !
And without the battery and the ac adapter plugin the U6000 was very hot !
For me the DCIN input that produce DC internal voltage and ref value was damaged.

Thanks for your feedback
Regards
Laurent

[rtstorm]

Re: Toshiba L650 power problem

hi, i have the sam problem. (i have only orangle blinking LED for battery low) no power when plug in adapter, i order U6000 (MAX17435) hope it will solve the problem. How did you test the U6000?

[Tuomo]

Re: Toshiba L650 power problem

hi, i have the sam problem. (i have only orangle blinking LED for battery low) no power when plug in adapter, i order U6000 (MAX17435) hope it will solve the problem. How did you test the U6000?

Plug AC adaptor ON.

Check U6000 PIN 10 ACOK = 0V this detect if AC adapter is ON.

Check L6000 = 12V. Charging voltage.

If those works U6000 probably works too.

If you use Battery +VBAT is 12V cause Battery has 12V.

[rtstorm]

Re: Toshiba L650 power problem

hi, i measure the value of U6000 ACOK = 5.34V, and L6000 = 3.44V

[Kriseh]

Re: Toshiba L650 power problem

hi, i measure the value of U6000 ACOK = 5.34V, and L6000 = 3.44V

I measure this value's too on a L650 Thosiba which won't charge battery anymore (works with new battery from ebay) and doenst work with AC adapter only.

Can I now conclude the U6000 chip is damaged?

[Tuomo]

Re: Toshiba L650 power problem

I measure this value's too on a L650 Thosiba which won't charge battery anymore (works with new battery from ebay) and doenst work with AC adapter only.

Can I now conclude the U6000 chip is damaged?

No, just AC Adapter not detected.

Measure PIN 19 ACIN this is pin which detect AC Adapter.

[Kriseh]

Re: Toshiba L650 power problem

No, just AC Adapter not detected.

Measure PIN 19 ACIN this is pin which detect AC Adapter.

Symptoms:
Thosiba runs fine on full battery, but can't recharge battery. Also with only AC Adapter plugged in I can't boot the laptop.

Measurements:
U6000:
ACOK (PIN 10) = 5.34V,
ACIN (PIN 19) = 1.69V

L6000 = 3.44V

[Tuomo]

Re: Toshiba L650 power problem

Symptoms:
Thosiba runs fine on full battery, but can't recharge battery. Also with only AC Adapter plugged in I can't boot the laptop.

Measurements:
U6000:
ACOK (PIN 10) = 5.34V,
ACIN (PIN 19) = 1.69V

L6000 = 3.44V

ACIN PIN19 1.69V indicate at there is AC Adapter inserted.

If ACIN PIN19 > 1.485V then ACOK = 0V.

ACOK PIN10 5.34V means at AC Adapter NOT detected.

If other voltages are OK, then U6000 may be FAILED.

[Kriseh]

Re: Toshiba L650 power problem

ACIN PIN19 1.69V indicate at there is AC Adapter inserted.

If ACIN PIN19 > 1.485V then ACOK = 0V.

ACOK PIN10 5.34V means at AC Adapter NOT detected.

If other voltages are OK, then U6000 may be FAILED.

This are my readings with AC adapter ONLY:

PIN 1 = 0V
PIN 2 = 0V
PIN 3 = 19.25V
PIN 4 = 5.43V
PIN 5 = 0.1V
PIN 6 = 0.35V
PIN 7 = 5.43V
PIN 8 = 1.23V
PIN 9 = 1.36V
PIN 10 = 5.36V
PIN 11 = 1.23V
PIN 12 = 1.23V
PIN 13 = 1.23V
PIN 14 = 0V
PIN 15 = 1.51V
PIN 16 = 1.51V
PIN 17 = 0V
PIN 18 = 0V
PIN 19 = 1.69V
PIN 20 = 5.37V
PIN 21 = 4.10V
PIN 22 = 5.37V
PIN 23 = 0V
PIN 24 = 0V

Can you make any conclussions to replace U6000 or not?

[Tuomo]

Re: Toshiba L650 power problem

This are my readings with AC adapter ONLY:

PIN 1 = 0V
PIN 2 = 0V
PIN 3 = 19.25V
PIN 4 = 5.43V
PIN 5 = 0.1V
PIN 6 = 0.35V
PIN 7 = 5.43V
PIN 8 = 1.23V
PIN 9 = 1.36V
PIN 10 = 5.36V
PIN 11 = 1.23V
PIN 12 = 1.23V
PIN 13 = 1.23V
PIN 14 = 0V
PIN 15 = 1.51V
PIN 16 = 1.51V
PIN 17 = 0V
PIN 18 = 0V
PIN 19 = 1.69V
PIN 20 = 5.37V
PIN 21 = 4.10V
PIN 22 = 5.37V
PIN 23 = 0V
PIN 24 = 0V

Can you make any conclussions to replace U6000 or not?

I would changed U6000.

Thanks excelent measurement.

[Kriseh]

Re: Toshiba L650 power problem

I would changed U6000.

Thanks excelent measurement.

Thanks for sharing your expertise,

I want to buy this one as a replacement:

Ebay Link

Is this one good to go? The number on the chip is slightly different from the one thats on the L650.

Ebay: 17435ETG239ITBS+
Motherboard: 17435ETG023ITAO+

What is the easiest way to replace with low cost/home made equipment? I don't have any professional SMD tools

[rtstorm]

Re: Toshiba L650 power problem

I replace one of these, you need IR soldering machine or you could try with hot air gun, but set ti to slow air flow

[Dark_Angel]

Re: Toshiba L650 power problem

Hi to all i to have a client Toshiba l650 that have the same problem, it work´s from battery if it is charged but wont charge or run from ac adapter only.
Im not an electronics engineer but i suspect the u6000 (maxim 17425e) its not ok.
This are the voltages i get:

PIN 1 = 0V
PIN 2 = 0V
PIN 3 = 19V
PIN 4 = 5.43V
PIN 5 = 0V
PIN 6 = 1.7V
PIN 7 = 8.7V
PIN 8 = 3.6V
PIN 9 = 3.7V
PIN 10 = 5.4V
PIN 11 = 3.6V
PIN 12 = 3.6V
PIN 13 = 3.6V
PIN 14 = 0V
PIN 15 = 3.6V
PIN 16 = 3.6V
PIN 17 = 0V
PIN 18 = 0V
PIN 19 = 1.7V
PIN 20 = 5.4V
PIN 21 = 4V
PIN 22 = 5.4V
PIN 23 = 0V
PIN 24 = 0V

Can someone confirm if they are correct? (i suspect not)

Thanks in advance.