🌡️ Samsung Galaxy A17 5G (SM-A176B) Mobile Heating Problem Solution: Thermistor (NTC) Locations and Test Guide
🚀 Introduction
One of the most common faults on the Samsung Galaxy A17 5G (SM-A176B) is an overheating warning while the phone is cold. The screen says the temperature is too high, and charging or heavy apps may be limited, even though the phone feels cool. Technicians also call this a thermal fault or thermal charging error.
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| Samsung Galaxy A17 5G Overheating Warning but Phone Is Cold: Find the Faulty Thermistor |
The cause is usually a faulty thermistor, a small temperature sensor on the main board. This guide shows the six thermistors in the Borneo Schematic reference, how to measure each one and when to replace it.
🔥 Overheating Warning on a Cold Phone: Find and Replace the Faulty Thermistor
⚠️ Legal Disclaimer
📋 Galaxy A17 5G: Key Specs
| Feature | Detail |
|---|---|
| Model | Samsung Galaxy A17 5G, SM-A176B |
| Chipset | Exynos 1330 (5 nm) |
| Display | 6.7-inch Super AMOLED, 90 Hz |
| Battery / Charging | 5000 mAh, 25 W wired |
| Operating system | Android 15 with One UI 7 at launch |
🧭 What a Thermistor Does
- The system reads each thermistor and decides when to slow the processor, limit charging or show a warning.
- A good sensor changes smoothly: warm it slightly and the reading falls; let it cool and it rises again.
- A damaged or leaky sensor gives a wrong value, so the phone reacts to a temperature that does not exist.
📍 The Six Thermistors in the Reference
The two images from the video show the six thermistors, each labeled with its designator and name. All are marked 100K.
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Galaxy A17 5G Temperature Too High Message? Test and Replace the Thermistor |
| Designator | Name | Monitors (by name) | Where on the board |
|---|---|---|---|
TH5001 | TH(AP_THM) 100K | Application processor | Next to the processor and memory area |
TH6000 | TH(PA_THM) 100K | Power amplifier | Left side, near the PA IC |
TH6001 | TH(CHG_THM) 100K | Charging circuit | Lower right of the memory area, near the connector |
TH6002 | TH(CF_THM) 100K | Likely the camera flash side, by name; confirm | Upper left, near the top components |
TH6003 | TH(LRPST_THM) 100K | Meaning of LRPST not shown; confirm in the schematic | Upper right, near the antenna contacts |
TH6004 | TH(WIFI_THM) 100K | Wi-Fi section | Center right, next to the Wi-Fi area |
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| Galaxy A17 5G Thermistor Locations: AP, PA, CHG, WIFI, CF and LRPST |
🔍 Galaxy A17 5G Mobile Heating Problem Solution
Step 1: Rule Out Software
- Update the software and test in safe mode.
- Check that the phone is not really hot: let it cool, remove the case and test again.
Step 2: Measure All Six Thermistors
- Disconnect the battery and let the board reach room temperature.
- Set the multimeter to resistance mode and measure each thermistor across its two pads.
- A healthy thermistor reads about 100 kΩ. Compare all six: they should be close to each other.
- Warm one slightly with your finger: the reading should fall slowly and return when cooled.
- Mark any thermistor that reads far lower, reads open, or does not change with temperature.
Step 3: Replace the Faulty One
- Remove the faulty thermistor with hot air at a safe temperature and clean the pads.
- Fit a new NTC 100K thermistor of the same size.
- Measure it again after soldering: about 100 kΩ at room temperature.
- Reconnect the battery and test charging and a heavy app for several minutes.
Step 4: If All Six Measure Normal
- Inspect pads and the area around the sensor for liquid residue or corrosion.
- Check the thermistor's sensing line against the schematic, from the pad to the processor or power IC.
- Test a known-good main board only as the last step.
🩺 Symptoms and Where to Look
| Symptom | Check first | Likely area |
|---|---|---|
| Overheating warning on a cold phone | All six thermistors, in resistance mode | A leaky or damaged thermistor |
| Charging stops or is limited | TH6001 (CHG), TH5001 (AP) | Charger or processor sensor |
| Warning during calls or data use | TH6000 (PA), TH6003 | Power amplifier or antenna-side sensor |
| Warning with Wi-Fi or hotspot | TH6004 (WIFI) | Wi-Fi sensor |
| Warning when using the camera or flash | TH6002 (CF) | Sensor near the flash side |
| Warning after liquid or a drop | Pads and the whole sensor area | Corrosion or cracked component |
🧠 Pro Tips
- Measure all six before replacing one; readings that disagree show the faulty sensor.
- Do not guess from the warning alone: the phone can show the same message for several sensors.
- Keep a few NTC 100K thermistors of the correct size in your parts box.
- Do not use a standard resistor in place of a thermistor; the phone needs the temperature behavior.
🎬 Video Walkthrough
The video shows the six thermistors on the board and how to measure and replace them.
🔗 Trusted External Links
| Resource | Why it helps |
|---|---|
| Borneo Schematics | The schematic and board-view resource used for the locations in this article |
| GSMArena — Samsung Galaxy A17 5G | Full specifications of the phone |
| iFixit — Samsung Galaxy A17 5G repair help | Device page with troubleshooting topics |
| Samsung — Galaxy A17 5G product page | Official device specifications |
| Samsung Support | Official manuals and troubleshooting |
| Wikipedia — Thermistor | How NTC and PTC thermistors work |
| Wikipedia — Steinhart–Hart equation | Relation between thermistor resistance and temperature |
| Wikipedia — Thermal management (electronics) | Background on how devices handle heat |
| Wikipedia — Multimeter | Using a multimeter for resistance tests |
| Wikipedia — Surface-mount technology | Background on tiny SMD parts |
⬇️ Download Section
| File | Format | Link |
|---|---|---|
| Galaxy A17 5G THERMISTOR — Location Reference | PNG / PDF | [Insert download link] |
☕ Support Our Work
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☕ Buy us a coffee on PayPal🙏 Special Thanks to the Borneo Schematics Team
A big thank-you to the team behind Borneo Schematics (www.borneoschematics.co.id). Borneo Schematics is a schematic and board-view resource for mobile devices, and it is the tool behind this whole series. It lets us select a net, highlight it in color across the board and see every component it passes through, which is exactly how the color-coded diagrams and the tracing shown in the video were produced. Without it, following these lines would mean measuring against a donor board.
Building and maintaining a resource like this takes serious work, and it saves technicians around the world a lot of time. Thank you to everyone on the team for making this knowledge available to the repair community.
Thanks also to the repair community and to every technician who shares knowledge and board data.
❓ FAQ
Why does my cold Galaxy A17 5G say it is overheating? A thermistor on the board is probably faulty, so the phone reads a false temperature.
How many thermistors does it have? Six in this reference: AP, PA, CHG, CF, LRPST and WIFI, all marked 100K.
What should a good thermistor read? About 100 kΩ at room temperature, falling as it warms.
