Apple A1466 notebook water damage no booting repair

Machine model: apple A1466

Main board version number: 820-00165-A

Malfunction:no power on, notebook no booting.

Apple A1466 notebook water damage no booting repair Figure 1.

Maintenance process:

This machine is water damage. After dismantling it, several places are found. It is quite serious to look at the sample water damage.

Apple A1466 notebook water damage no booting repair Figure 2.

Apple A1466 notebook water damage no booting repair Figure 3.

Apple A1466 notebook water damage no booting repair Figure 4.

The washing brush carefully looked at the places of water damage, but found no corrode. The Diode value is normal on the ground, especially Inductor for CPU, was measured to be normal. Next, power-on measurement shows that the power light is orange and there is standby.

Apple A1466 notebook water damage no booting repair Figure 5.

Measured PP3V42_G3H VCC 3.42V is normal; PPBUS_G3H VCC 8.6V is normal; Standby PP3V3_S5 VCC 3.3V is normal (PP5V_S4RS3 5V will not be sent out until VCC); Working conditions of SMC pp3v3 _ S5 _ avref _ SMC and SMC _ reset _ l are normal. According to VCC SMC, after receiving SMC_OFF_L, it will also send out PM_PWRBTN_L signal to CPU, which proves that SMC is working, but CPU does not send PM_SLP_S4_L to start VCC such as PP5V_S4RS3 and memory, which proves that CPU is not working.The next step is to check the standby working conditions of CPU.
Apple A1466 Hasswell-ULT single CPU timing analysis: According to INTEL’s official timing, the bridge module needs to get VCCRTC, generate RTCRST#, and then get deep sleep standby VCC VCCDSW3_3 and deep sleep standby VCC good DPWROK, then it will send SLP_SUS# to start light sleep standby VCC VCCSUS, and then get RSMRST# to be considered as the completion of standby.
It can be concluded from this passage that the bridge standby requires the following conditions: 1. VCCRTC VCC and CLK of 32.768 kHz of the bridge module (although CLK is not mentioned above, it is an essential condition): these two conditions will be directly generated after VCC PP3V42_G3H is obtained from U19013 pin, and PPV will be measured.

Apple A1466 notebook water damage no booting repair Figure 6.

2.RTCRST#: Pull-up provided by PPVRTC_G3H. Introducer *, INTV RMEN, SRTCRST * and RTCRST * are all normal.

Apple A1466 notebook water damage no booting repair Figure 7.

3.VCCDSW3_3: provided directly by standby PP3V3_S5, which is normal. 4.DPWROK: When the standby 3.3V PP3V3_S5 is normal, the standby chip TPS51980A 20th pin will send S5_PWRGD to SMC, and SMC will send PM_DSW_PWRGD to CPU after receiving this PG. This condition is normal. 5.SLP_SUS#: When PCH gets VCCDSW3_3 and DPWROK, it will send PM_SLP_SUS_L to open SUS VCC. 6.VCCSUS:U8020 receives EN of P3V3SUS_EN converted by PM_SLP_SUS_L, and then generates PP3V3 _ SUS, which gives VCCSUS3 and VCCSPI VCC of the bridge module.Back to U6100 BIOS chip VCC, which is normal all the way. 7. RSMRST#: After PP3V3_SUS is generated, PM_RSMRST_L will be generated to CPU after the second pin of U8130 detects that it is normal. This condition is normal. At this point, the working conditions of the CPU are basically satisfied. Recalling that the CPU has been flooded, I threw the board into the oven first. Take out the motherboard and disassemble the CPU.

Apple A1466 notebook water damage no booting repair Figure 8.

After removing it, I carefully read the water damage part, and there are indeed traces of water damage.

Apple A1466 notebook water damage no booting repair Figure 9.

Next, clean CPU REBALLING and board PAD.

Apple A1466 notebook water damage no booting repair Figure 10.

Apple’s board is not marked, so before disassembling the CPU, it can be positioned by gently marking around the CPU, which is convenient to align the welding CPU again.

Apple A1466 notebook water damage no booting repair Figure 11.

The next step is to do the CPU back, because no obvious Short circuit was detected, so try to redo the CPU. Here are the photos of the CPU that has been done back.