HP 15-bs139ng płyta DKL50 LA-E802P rev: 1.0 zwarcie na PQB11

HP 15-bs139ng
płyta DKL50 LA-E802P rev: 1.0
CPU: SR3LC
GPU: 216-0864032
KBC: ene KB9022Q D

Witam!

Laptop nie reaguje na włącznik i nie sygnalizuje podłączenia zasilacza. Znalazłem na płycie totalnie spalony PQB11 jednak po jego wymianie i podłączeniu zasilania dalej brak reakcji na włącznik i zauważyłem, że szybko nagrzewają się PQB11, PQB12, PQB13. Znalazłem na PRB1 bardzo niską rezystancję = 0,09 OHma. Bardzo proszę o pomoc w znalezieniu usterki

soczek42 napisał(a):Znalazłem na PRB1 bardzo niską rezystancję = 0,09 OHma.

Hello!
Is that resistance measured in reference to the ground? If so, you have a short circuit to ground on main power rail "B+". In this case perform a short circuit test described here on any pin of resistor PRB1. For a short circuit test limit the voltage to 1V.

Thank You for reply! Yes this resistance is measured to ground and PRB1. I have done this test on PRB1 and start from 1V but i can't find any warm element so i give there one by one V more and I reached 19V. Again I cant find any warm element ? Always (1v or 19v) i have 5A consumption in this short circuit. Also i solder + and - wire from supply to gronud and 1 pin PRB1, test wires have 2.5 mm2 size

Measure the voltage on the end of test wires (at the point, where they are soldered to the board) during a short circuit test at current 5A.
Do not exceed the voltage 1V for now, because you may cause additional damage on the board this way.

Ok thank You. In The end test wires with 5A current i have 0,22V

It seems the damaged component has a very low resistance, so you have to repeat the test at greater current. You probably will have to go up to 8-10A to find the damaged component.

I found a shorted SMD capacitor under PQV1. After desoldering, the short circuit in B + stopped. There are two SMD capacitors. The short circuit has a capacitor closer to the KBC pin 64. Can you tell what capacity this capacitor has ?

soczek42 napisał(a):There are two SMD capacitors. The short circuit has a capacitor closer to the KBC pin 64. Can you tell what capacity this capacitor has ?

Both capacitors are the same - 10µF/25V, package 0805.

After replacing the capacitor, the board came to life. Thank You matic! The laptop turns on and works, but right after installing the AMD GPU driver, the image on the matrix disappeared and the laptop reset. Now it resets as soon as the system boots. After removing the AMD driver, the laptop works. Looks like AMD graphics is damaged.

Is there any way to remove the AMD GPU and only use the GPU from the CPU? What can I remove from motherboard to use only GPU from i7 CPU ? It does not depend on the performance of the AMD GPU, the most important is working in Win10 with full resolution

soczek42 napisał(a):Is there any way to remove the AMD GPU and only use the GPU from the CPU?

Yes, it is probably possible, but it is hard to know how to do that without the schematic.
Try to remove the GPU coils PLV1 and PLV2 from the board.

After remove PLV1 and PLV2 AMD GPU is not available in device manager more and in win10 now I have full resolution on intel HD from CPU. Matic Thank You very mutch again!