HP tpn-i133 pull adapter notebook Blurred screen crash repair

HP tpn-i133 notebook Blurred screen crash, remove the motherboard, there is a resistance corroded by moisture,corroded by moisture resistance measurement 356k.The 7th pin VDDQ of the chip_Ton is 510k.This resistor is to change the frequency of Switch and change it to 510k resistor directly. It is normal,VCC 1.22V.

Machine model: HP tpn-i133 notebook

Fault phenomenon: laptop Blurred screen crashes

Maintenance process:
An HP tpn-i133 laptop, boot normally with the adapter, the battery is charged, unplug the adapter, the laptop Blurred screen crashes, every time.
There are many reasons for Blurred screen crash, such as memory, CPU,Nand,VCC, and so on. Replacing the memory and Nand is not a problem. It also happens under BIOS, and no problem is found in the preliminary measurement.

Remove the motherboard and observe that only USB port has cockroach excrement on the motherboard.Check carefully that there is a resistor corroded by moisture.Cleaning solvent is cleaned, the test memory VCC circuit is normal, the adapter battery is normal.

HP tpn-i133 pull adapter notebook Blurred screen crash maintenance Figure 1

If you can’t turn on the adapter, it will be another day to install the battery.
Measure the memory VCC. When the adapter is pulled out and the fault occurs, the VCC is 1.16v, and the plug-in adapter has 1.22V, but 1.16v should be abnormal. Remove the resistance of corroded by moisture and measure 356k.

HP tpn-i133 pull adapter notebook Blurred screen crash maintenance Figure 2

G5388 memory VCC circuit, find other machine drawings for reference, chip 7 pin VDDQ_Ton is 510k.

HP tpn-i133 pull adapter notebook Blurred screen crash maintenance Figure 3

This resistor is to change the frequency of Switch and replace it with a 510k resistor. It is normal.VCC 1.22V. Start up test.Normally booting up. Troubleshooting and maintenance are over.

HP tpn-i133 pull adapter notebook Blurred screen crash maintenance Figure 4