Acer X223 X223W LCD Service Guide - Page 29

28 ACER X223W Go to cover page 5. Troubleshooting (continued) 5.8 Checking the resolution change IC movement Check +3.3V supply on I305 pin8, pin14, pin16, pin24 , pin32, pin49, pin56, pin75, pin98 NG OK Proceed " Checking the DC/DC converter circuit" section. Check +1.8V supply on I305 pin 51, 66, 82, 34. NG OK Proceed " Checking the DC/DC converter circuit" section. Check X301 14.318MHz clock input to I305 pin96 and pin97 at TTL level. OK NG Check I305 pin 84 HWRESET signal is low level at normal operation. NG OK Check I305 pin37, pin38, pin39, pin40 SPI signal (Same as the IIC signal). Failure Point I306 failure. NG OK Failure Point 1) Printed wire broke between X301 and I305 pin96, pin97. 2) C379, C380 is short or open. 3) X301 failure. Check if D328 pin1 is low. Failure Point 1) Printer wire broke between I305 pin84 NG and C378 2) C78 is short. Failure Point 1) Printer wire broke between I305 pin84 and C378. OK 2) C381 is short. 3) R358, D328 is failure 4) I305 is failure Failure Point 1) Printed wire broke between I305 pin37, pin38, pin39, pin40 and I306 pin1, pin2, pin5, pin6. 2) I306 failure.