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Dell Latitude E6330 ( LA-7741P) no 19V with PSU
https://vlab.su/viewtopic.php?f=41&t=116200		 Страница 1 из 1
f-bone [ 08 июн 2021, 11:32 ]
Заголовок сообщения:  Dell Latitude E6330 ( LA-7741P) no 19V with PSU
Hi friends,

I have this E6330 that when you connect the original Dell charger the BLUE light on the charger turns off.

I replaced the DC jack because it had problems but also the motherboard seems to have issue:

1) there is NO short at 19V, if I inject voltage at PL3 (19V) I see voltages everywhere 3.3V, 5V always are ok.
2) I replaced PU801, PQ2 and input mosfets PQ4, PQ27 (they were ok but just incase of mulfunction)
3) I removed PU1 but still the same, the charger blue light turns off
4) If I use HP charger (no turn off) I can only measure 4V at PQ27..

Photo of blue light: https://drive.google.com/file/d/1sSs2nJ ... sp=sharing

Any ideas please?
Oleh Molinskyi [ 09 июн 2021, 11:30 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
The blue light turns off because there is a problem with the motherboard (if the power supply is definitely working properly). Probably there is a short circuit on the board and the power supply goes into protection mode. Check the resistance on all large coils on the board, you need to find a short circuit.
f-bone [ 09 июн 2021, 12:05 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
hi! thank you for your input.

When I inject 19V at PL3 (DC input coil) from lab-PSU the motherboard turns on and works OK.
Oleh Molinskyi [ 09 июн 2021, 12:51 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
Chek the dc-jack and all ceramic capacitors at the input for a short circuit.
f-bone [ 10 июн 2021, 18:59 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
Thank you Oleh, when I inject voltage at pin1 of PL3 with bench PSU the motherboard works! ---> No shorts.. I do not know what is going on here...
Oleh Molinskyi [ 11 июн 2021, 09:47 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
It's good, but it will not work properly without "NB_PSID" (Middle pin of power supply connector, The battery will not charge, problems with processor frequencies...).
f-bone [ 11 июн 2021, 15:14 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
yes I know :(

any ideas why it works with 19V injection but NOT with charger (charger goes to protection mode)?
Oleh Molinskyi [ 14 июн 2021, 11:25 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
Try removing the choke PL2 from the board (for a test) and turn on the board without it. And if possible, change the dc-jack for a new.
Sergej [ 14 июн 2021, 12:18 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
f-bone, my stupid question: have you tried another PSU? :du_ma_et:
f-bone [ 17 июн 2021, 15:02 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
yes I tried 2 PSUs (there are no stupid questions from smart people!)... also I removed the PL2 but again goes in protection mode (see video: https://share.icloud.com/photos/0EvFsJs ... Q#Melissia)

If I put 19V on wire at PL3 (video) the laptop works (photo: https://share.icloud.com/photos/0SMhUsJ ... g#Melissia)

I think the science will give up now :(
Oleh Molinskyi [ 17 июн 2021, 15:56 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
You have a short circuit on the board (in front of the PL3 choke, right after the connector socket), or the DC-JACK(connector with wire) is faulty. Therefore, the power supply goes into protection.
Vesko356 [ 20 июн 2021, 17:08 ]
Заголовок сообщения:  Re: Dell Latitude E6330 ( LA-7741P) no 19V with PSU
Check resistance to ground at the pins of the DC connector (motherboard DC connector side - PJPDC1).
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