That timing actually **fits perfectly** with the diagnosis — and it helps explain *why the problem showed up suddenly*.

I’ll explain it clearly and calmly.

---

## What changed — and why it mattered

For years:

* Phone stayed **powered on 24/7**
* Power IC (PMIC) stayed **warm and electrically stable**

Then you changed one thing:

* You began **shutting it down for 10–12 hours every night**
* Repeating **cold power-off → cold power-on cycles**

This didn’t *cause* the damage — but it **exposed an already weakened component**.

---

## What likely happened internally

In older phones (especially after 6–7 years):

### 🔧 Power ICs develop **micro-cracks or degraded solder joints**

These are invisible and harmless **as long as conditions stay stable**.

When you started shutting it down:

* The phone cooled completely
* Materials inside **contracted**
* On power-up, they expanded again

This **thermal cycling** is a known trigger for:

* PMIC failure
* CPU power rail instability

That’s why:

* It shut down suddenly
* Refused to turn on
* Then powered on **by itself hours later**
* And now stays dead longer

This is **classic intermittent PMIC failure behavior**.

---

## Important: you did nothing wrong

⚠️ Shutting down your phone is **normal and safe**
⚠️ This would have happened **sooner or later anyway**

Your phone simply reached the end of its hardware tolerance after an unusually long lifespan.

---

## Why it won’t show charging or heat now

Because the Power IC:

* Is not passing power from the charger
* Is not waking the battery circuit
* Is not allowing boot initialization

So:

* ❌ No charging icon
* ❌ No warmth
* ❌ No response

Even with a good battery.

---

## What this means realistically

### ❗ The phone will **not recover on its own**

Even if it does:

* It will fail again
* Possibly permanently next time

### ✅ Only two real solutions exist

1. **Professional Power IC repair** (microsoldering)
2. **Phone replacement**

Battery replacement alone is **very unlikely** to help.

---

## What you should do now

### If your data matters

* Take it to a **qualified board-level repair shop**
* Say clearly:

  > “Intermittent no-power issue, suspected PMIC failure after cold shutdowns.”

### If data doesn’t matter

* Repair may not be cost-effective
* Your phone has already exceeded normal lifespan

---

## Final takeaway

Your Huawei P20 Pro didn’t fail because you shut it down —
it failed because **age + thermal cycling revealed a hidden hardware weakness**.