HP tpn-i133 notebook flower screen crash repair

Model: HP TPN-I133

Malfunction: notebook Blurred screen crashes.

Maintenance process:

An HP TPN-I133 notebook was turned on normally with the adapter, and the battery was charged. When the adapter was unplugged, the notebook Blurred screen crashed, every time.
Blurred screen crashes for many reasons, including memory, CPU,Nand,VCC, etc. There is no problem in replacing memory and Nand, even under BIOS. Preliminary measurement shows no problem.
Remove the motherboard, and observe that only USB port on the motherboard has cockroach droppings. Look carefully, there is a resistor corroded by moisture.Cleaning solvent is cleaned, the circuit of VCC in memory measurement is normal, and the battery used in adapter is normal.

HP tpn-i133 notebook flower screen crash repair Figure 1.

After one day’s test, the battery can’t be turned on when the machine is turned on again, and it’s the same when the adapter is pulled out. Measure the memory VCC. when the adapter is unplugged and fails,VCC is 1.16V, but when the adapter is plugged in, it is 1.22V, but 1.16V should be abnormal. remove the resistance of corroded by moisture and measure 356K.

HP tpn-i133 notebook flower screen crash repair Figure 2.

G5388 memory VCC circuit, find other machine drawings for reference, the chip’s 7 pin VDDQ_TON is 510K.

HP tpn-i133 notebook flower screen crash repair Figure 3.
The resistance is to change the frequency of Switch, and it is normal to directly change the resistance of 510K,VCC 1.22V, start-up test Normally booting up, troubleshoot and repair it.