Shinelon T1 Notebook Won't Turn On repair

Shinelon T1 Notebook Won’t Turn On repair

Shinelon T1 notebook computer Won’t Turn On, fault repair after replacing Q114.

Model: Shinelon T1

Fault symptom: notebook computer Won’t Turn On

Maintenance process: disassemble it, buckle down the small battery, put a power on it and try again, but it still doesn’t work. After measuring the common points, I found no Short circuit. After simply scanning the whole board, it was found that one Inductor was burnt black, and one measure was 0 to the ground. Looking at the drawing,Inductor was 3V.Inductor was immediately overjoyed, and it was found that the bridge was hot. After the BGA Rework Station was taken down,diode value was measured again. It has been restored.

Shinelon T1 Notebook Won’t Turn On repair Figure 1.

Shinelon T1 Notebook Won’t Turn On repair Figure 2.

After seeing that the bridge was SR17D, I started rummaging through boxes and cupboards to find Parts motherboard, but I had to buy one on Taobao. After a few days, the bridge arrived, so I went straight to BGA Rework Station and then brushed the BIOS. I plugged it in and turned it on with joy or no power on. Did I buy a bad bridge? Check EC first!

Shinelon T1 Notebook Won’t Turn On repair Figure 3.

Turn the board over to look at the EC on the opposite side, and find that others have done it, and it’s oily. I feel that it’s the problem. I removed one from Parts motherboard and tried it again. Sure enough, I ran happily to booting up according to the startup current. However, when I entered the system, I found that his system was broken, and called my peers to take it back and install the system themselves.

Shinelon T1 Notebook Won’t Turn On repair Figure 4.

I thought it was so good, but the next day, my colleague said that I couldn’t recognize it. Sure enough, I didn’t recognize that there was only one INTEL integrated display in the system. Did I brush the BIOS by myself, or did I brush a few more or not? I changed the ME brush with the original BIOS, and found that it was still a bird’s sample. Since then, I can rule out the BIOS problem.

I measured the two VCC and memory VCC of the graphics card. Sure enough, there is no future for three axes. Honestly, open the drawing and start measuring the conditions of the VCC chip of the graphics card.

Shinelon T1 Notebook Won’t Turn On repair Figure 5.

It is found that there is no EN, and EN is turned on by Q50. A quantity of Q50 G has 3V, which is definitely wrong. The G level of Q50 must be low before it can be turned on. The prerequisite for Q50′ s G level to be low is that Q113 is turned on, and its G level must be high. The G level of Q113 is controlled by the signal GPIQ5_PWR_ON#.

The quantity is not 3.3V, and we continue to follow the drawing to find that VCC of this signal is provided by 3V3_AON, and its VCC is conducted by Q49. If Q49 wants to conduct, Q114 must conduct first.

Shinelon T1 Notebook Won’t Turn On repair Figure 6.

Prepare Q114, and find that Q114 is next to Q113 and was taken down by the last family. I found one on Parts motherboard to make it up, and then the GTX965m finally came out, and the driver was punched conveniently. The repair of this machine is completed.