Samsung np300e5a turn on but no image

[jp_jota]

Re: Samsung np300e5a turn on but no image

i have a short sound in this line, but when turn on i have a 1.064V, and in the coil l3 ddr3 line i only have 1.5V without cpu, with cpu have 0V in this line. thanks for the help

[Techtiger]

Re: Samsung np300e5a turn on but no image

i have a short sound in this line, but when turn on i have a 1.064V, and in the coil l3 ddr3 line i only have 1.5V without cpu, with cpu have 0V in this line. thanks for the help

test U507 TPS5111 pin 1 4 6 10 11 voltage with and with out the CPU
(the short sound in line, but when turn on i have a 1.064V thats normal )

[jp_jota]

Re: Samsung np300e5a turn on but no image

without cpu
1-3.15V
4-5.012V
6-bewteen 270Mv and 280Mv
10-5.091V
11- 103Mv

wtih cpu

1-3.15V
4-5.003V
6-0V
10-5.091V
11-103Mv

[caspian]

Re: Samsung np300e5a turn on but no image

Measure resistance on the hot Coil in the photo with and without CPU.
As you wrote 00.64 Ohms in the photo, I got confused whether it is 0.64 Ohms or 64 Ohms?

[jp_jota]

Re: Samsung np300e5a turn on but no image

hello, without cpu its 34.12 Omhs with cpu is 0.64 Ohms

[caspian]

Re: Samsung np300e5a turn on but no image

So it seems the CPU is defective. Try to turn the laptop on using another CPU. The CPU should be compatible to this mainboard. If there is no picture on the screen, turn the laptop off immediately to avoid damage to the new CPU. If you have found such a CPU, measure resistance on that hot coil again using the new CPU.

[jp_jota]

Re: Samsung np300e5a turn on but no image

Using a new CPU i turned te laptop on and it showed no image on the screen. Then i measured the resistance that changed from 0.64 Ohms to 0.13 Ohms.

[caspian]

Re: Samsung np300e5a turn on but no image

I guess this mainboard does not worth repairing. I had many mainboards like this one. after lots of work and repairing, the problem reappeared. I recommend that you buy a new mainboard without Graphics chip for this laptop.