Asus x551ma no display

[khelane]

hi all

i have a asus x551ma rev: 2
When the phone cable is connected to the usb port of the device is turned off.
checked a board .
reflash bios and ec 2 and 3 time with badcap bios
washing board .
after flash bios system start but no display and after 10 or 15 minute fan spin,
but no display.
19v present
5 v present
3,3 v present
1.3v ram present
1.014 vcore present
1.8v on pin8 ic bios present
but 1.5 volt and 2volt on 2and 3 pin usb 2
usb+ usb- are 1.5 and 2 volt!

Link to boardview https://www.badcaps.net/forum/troubl...51ma-boardview

[mcplslg123]

Re: Asus x551ma no display

Measure the resistance on D+ and D- pins of usb port.If the resistance is low then you need to check components which are connected to the usb lines.

[khelane]

Re: Asus x551ma no display

Measure the resistance on D+ and D- pins of usb port.If the resistance is low then you need to check components which are connected to the usb lines.

D+ 79.5 ohm
D- 79.5 ohm

RN5207 connected to two pin and going striaght cpu
RN5207 is 0 ohm

ohh i know understand this device need a 1.8 programmer adapter for programm
i haven't it

[mcplslg123]

Re: Asus x551ma no display

So you programmed the chip in usual 3v socket?? If so the eeprom chip itself may be fried. So better, get a 1.8V adapter as well a new 1.8V bios chip and then flash it again. Dont experiment un-necessarily without following these two steps. A slight mistake can kill the soc.

[khelane]

Re: Asus x551ma no display

So you programmed the chip in usual 3v socket?? If so the eeprom chip itself may be fried. So better, get a 1.8V adapter as well a new 1.8V bios chip and then flash it again. Dont experiment un-necessarily without following these two steps. A slight mistake can kill the soc.

yes ,but i didnt know this subject, this ic bios is 1.8 volt.
so i have be get a one of 1.8 adapter.
tnx