SM3010 IC
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SILICON MITUS SM3010 (SOEMC50_SM) HARDWARE & CHIP-LEVEL REPAIR GUIDE
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SECTION 1: FUNCTIONAL ARCHITECTURE & CIRCUIT ROLE
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- Architecture: Triple-Output Switching Regulator for AMOLED Display Bias.
- Input Voltage Range (PVIN / AVIN):
* 2.9V to 5.0V DC (fed directly from the main battery / VBAT / VSYS rail).
- Output Rail 1 (VO1 - ELVDD Boost Converter):
* Synchronous step-up converter delivering a fixed positive bias of +4.60V DC
to OLED pixel anodes (LX1 switching node via external boost inductor).
- Output Rail 2 (VO2 - ELVSS Inverting Buck-Boost Converter):
* Generates a programmable negative bias voltage from -4.0V down to -1.4V DC
(LX2 switching node) to supply the OLED pixel cathode ground plane.
- Output Rail 3 (VO3 - AVDD Boost Converter):
* Generates a programmable analog driver voltage from +6.9V to +7.9V DC
(Default: +7.60V DC via LX3 switching node) for AMOLED column driver ICs.
- Control & Programming Interfaces:
* ASWIRE Interface: Single-wire digital pulse line enabling/disabling VO3
and dynamically programming AVDD voltage.
* ESWIRE Interface: Single-wire digital pulse line enabling/disabling VO2
and dynamically adjusting negative ELVSS voltage for display brightness.
* SET Pin: Hardware table-selection strap pin for default AVDD reference.
- Integrated Protections:
* Short-Circuit Protection (SCP) with latched shutdown mode across all outputs.
* Under-Voltage Lockout (UVLO), Over-Current Protection (OCP), and Thermal
Shutdown (TSHUT).
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SECTION 2: BOARD-LEVEL FAULT SYMPTOMS
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1. Black Screen / Blank Display with Sound and Vibration:
- Phone turns on, receives calls, vibrates, and shows notification sounds,
but the AMOLED screen remains completely dark due to missing VO1 (+4.6V),
VO2 (-4.0V), or VO3 (+7.6V).
2. Screen Flashes Once and Goes Black on Boot:
- The display flashes the white Samsung logo for a millisecond and goes pitch
black. This occurs when SM3010 detects a short circuit on either ELVDD or
ELVSS and triggers its internal latched shutdown protection.
3. Dim Display / Distorted Colors / Green Tint:
- VO2 (ELVSS) negative rail fails to reach -4.0V (stuck at 0V or fluctuating
at -1.0V), causing improper cathode potential on OLED subpixels and producing
a dull green/purple hue or zero contrast.
4. Motherboard High Current Drain / Heating Near Display FPC:
- An internal high-side switching FET punch-through in SM3010 shorts the main
VBAT/PVIN line directly to ground, pulling heavy current (1.5A - 3.0A) and
overheating the area adjacent to the display connector.
5. Inoperative Touch / Flickering Lines on AMOLED Panel:
- Instability or missing AVDD (+7.6V VO3) rail causes OLED gate-in-panel (GIP)
timing drivers to freeze.
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SECTION 3: STEP-BY-STEP MULTIMETER TESTING & DIAGNOSTICS
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[A] Cold Testing (Diode Mode Readings - Red Probe on GND, Black Probe on Line):
- PVIN / AVIN Input Capacitor (Pins A5, B4, B5, A4):
* Normal Diode Value: 0.380V - 0.480V (380mV - 480mV).
* If < 0.030V: Direct short circuit on the main power feed to SM3010.
- VO1 (ELVDD Output Filter Capacitors - Pins D2, E2, E3):
* Normal Diode Value: 0.450V - 0.550V.
- VO2 (ELVSS Output Filter Capacitors - Pins D4, E4, E5):
* Normal Diode Value: 0.500V - 0.650V (measure reverse polarity if necessary).
- VO3 (AVDD Output Filter Capacitor - Pin A1):
* Normal Diode Value: 0.420V - 0.520V.
- Control Lines (ASWIRE Pin C3, ESWIRE Pin B2):
* Normal Diode Value: 0.450V - 0.600V on both logic control pins.
[B] Hot Testing (Live Measurements with Battery & Screen Connected, Display Awake):
- Note: AMOLED voltages ONLY trigger when the screen is actively woken up!
- Check PVIN / AVIN: Must measure live battery voltage (3.8V - 4.2V DC).
- Probe VO1 Output Capacitor: Must measure solid +4.60V DC.
- Probe VO2 Output Capacitor: Must measure stable negative voltage (-4.0V DC).
- Probe VO3 Output Capacitor: Must measure +7.60V DC.
- If all three outputs read 0V while PVIN is present:
* Check ASWIRE and ESWIRE lines with an oscilloscope for incoming 1.2V pulses
from the Application Processor / Display DSI bridge.
[C] Rosin Smoke / Thermal Camera Short Localization:
- If VBAT or any display rail is dead shorted, smoke SM3010 and its three inductors
(LX1, LX2, LX3 coils).
- Inject 4.0V onto PVIN (or 3.0V onto VO1/VO3 if output rail is shorted).
- Instant melting directly over the SM3010 glass die confirms internal regulator
failure requiring chip replacement.
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SECTION 4: SOLDERING, REBALLING & REWORK SPECIFICATIONS
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- Component Fragility:
* SM3010 is an ultra-miniature, wafer-level chip scale package (WLCSP-25) with
bare silicon die edges. It is extremely sensitive to physical chipping,
excessive mechanical pressure, and thermal shock.
- Desoldering Guidelines:
* Hot Air Station Temperature: 335°C - 345°C.
* Airflow Rate: 35% - 40% with a 5mm rounded nozzle.
* Protect the adjacent plastic display FPC connector and CPU with double-layer
thermal Kapton tape and aluminium shielding.
* Apply a droplet of high-activity tacky flux (Amtech NC-559-V2).
* Direct hot air vertically in gentle circular sweeps for 12 - 18 seconds.
Lift the chip straight up with precision fine-tipped tweezers once all
25 solder balls liquefy.
- PCB Footprint Preparation:
* Set soldering iron to 320°C - 330°C.
* Add a tiny bead of leaded solder (Sn63/Pb37) to lower the melting point of
factory lead-free solder residue.
* Use fine copper desoldering wick to gently planarize all 25 pads completely flat.
Avoid rubbing vigorously to prevent lifting delicate 0.40mm copper pads.
* Clean thoroughly with 99.9% Isopropyl Alcohol (IPA) and inspect under microscope.
- Reballing Specifications:
* Stencil: Dedicated SM3010 / SOEMC50 / Universal WLCSP-25 (0.40mm pitch, 5x5 array).
* Solder Paste: Sn63/Pb37 (183°C melting point, Type 4 or Type 5 fine powder).
* Press dried solder paste firmly into stencil apertures.
* Reflow using hot air gun at 280°C - 290°C with low airflow (20%) to form
perfect, uniform solder spheres.
- Alignment & Installation:
* Match Pin A1 orientation dot with the corresponding triangle/dot mark on PCB.
* Coat the footprint with an ultra-thin layer of tacky flux.
* Solder at 335°C - 340°C with 35% airflow.
* Surface tension will self-align the chip over the 25 pads. Apply an extremely
light microscopic tap with tweezers to verify molten solder seating.
* Allow the board to cool down completely before mounting the AMOLED display.
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