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• GWA7.820.809-2 is not a bare “sensor”, but a complete Philips front-panel IR/LED/Key interface board used in many Philips-/TP-Vision-branded TVs (≈2014 – 2021).
• It integrates:
– a 38 kHz demodulating IR receiver (3-pin device, e.g. Vishay/everlight TSOP-family),
– the red (stand-by) / sometimes bi-colour status LED,
– a single tactile “local key” push-button,
– a 4- to 6-wire flat-cable connector to the mainboard.
• Alternate Philips part numbers seen in logistics systems: 317GAIRM002HTG, 715GAIRM005HTG (HW version V0.2).
• Typical supply voltage 3.3 V, idle output HIGH, active pulses LOW, detection ±45 ° cone.
Functional blocks
• IR demodulator: Band-pass ≈ 36-40 kHz, AGC, envelope detector, open-collector logic output.
• Status LED driver line: Sourced from the mainboard (current-limited on host).
• Key line: Normally open; pulls LOW when the front-panel button is pressed.
• Connector (most common 5-pin 1 mm or 1.25 mm FFC):
1 = VCC (3.3 V), 2 = GND, 3 = IR_OUT, 4 = KEY, 5 = LED_CTRL. Some sets add pin 6 for I²C-light-sensor on newer versions—verify silkscreen.
Electrical characteristics (measured on working sets)
• VCC = 3.3 V ± 5 %, Iq ≈ 0.6 mA (IR idle), ≤ 5 mA with LED ON.
• IR_OUT idle level ≈ 3.3 V via pull-up, logic LOW pulses ≈ 0 V, pulse width mirrors remote coding (e.g. 560 µs/1.69 ms for NEC).
• Operating temperature –20 … +70 °C, ambient light immunity up to 600 lux; above that, remote range degrades.
Mechanical variations
• PCB colour green or brown, size ≈ 28 × 12 mm, plastic light-guide glued to LED.
• Housing differs slightly between 2014, 2016, 2019 chassis—always match complete part number to avoid mismatch with bezel cut-out.
Typical host chassis list (non-exhaustive)
32PHS5505, 32PFS6805, 42PFH6309, 47PFK6559, 48PFK6609, 50PUS7304, 55OLED754, 65OLED804, 70PUS6504, etc. Production batches may swap to 820.675-2 or 820.628-5B; verify visually.
Failure modes
• No remote response, LED still works → IR demodulator damaged (ESD, surge).
• Intermittent remote control, worsens under strong light → ageing / marginal supply.
• No LED, no key, but 3.3 V present on mainboard connector → flat cable open.
• 0 V on VCC pin → mainboard standby regulator fault, not the IR board.
Diagnostic waveforms
Connect oscilloscope to IR_OUT: expect clean 38 kHz-burst envelopes ~3.3 V → 0 V. Excessive ringing or constant LOW = defective.
• Stock availability: mainly salvage – eBay, Aliexpress, European TV-spare portals. Prices 8 € – 18 € used/tested (Feb 2024).
• TP-Vision’s current TV platforms start to integrate IR receiver on the bezel Wi-Fi/BT combo board; discrete GWA7 modules may be phased out.
• Some 2022+ Philips remotes add Bluetooth voice; IR board is still maintained for legacy control but less critical.
Infra-red remote principle: carrier-modulated (usually 38 kHz) IR light is demodulated to TTL pulses by the on-board IC which contains a photodiode, automatic-gain control, a band-pass centred on 38 kHz, and a demodulator. This suppresses ambient light and delivers clean logic suitable for the TV’s MCU UART/IR decoder.
• Using genuine or equivalent parts respects manufacturer safety (creepage, fire rating).
• Counterfeit IR receiver ICs with incorrect AGC can reduce range or create phantom keying—source parts responsibly.
• Opening TVs exposes to mains voltages; follow IEC 62368-1 safety rules, unplug and discharge before handling.
REPLACEMENT PROCEDURE
TEST AFTER REPLACEMENT
• Stand-by LED should light.
• Aim known-good remote; TV should power-on.
• If not, scope IR_OUT; if good, suspect mainboard decoder.
Potential challenges & fixes
• Cable length differs → transplant original FFC.
• Bezel window tinted film mis-aligned → remote range weak.
Best practices
• Use anti-static wrist strap; IR demodulator is ESD-sensitive (HBM 2 kV).
• Keep soldering < 260 °C, < 5 s if you replace only the 3-pin device.
• Datasheets for the full board are not public; only functional pinout can be inferred.
• Minor board revisions (V0.1, V0.2) are usually interchangeable, but confirm connector keying.
• In some AmbiLight sets the LED line is PWM-driven; plugging wrong board may short the driver.
• Obtain the service manual of your exact chassis (e.g., TPM19.3E LA) – includes IR/LED board schematic.
• Compare performance of original Vishay VS1838B vs. TSOP38438 replacements.
• Explore replacing IR with BLE receiver to modernise remote interface.
GWA7.820.809-2 is Philips’ dedicated IR receiver/LED/button front-panel PCB fed with 3.3 V and outputting demodulated 38 kHz pulses to the mainboard. It is common to dozens of Philips TV models between 2014 and 2021. When the TV ignores the remote, confirm remote function, cable integrity, and 3.3 V supply; if those are fine, swap the board (readily available used). Always match the full part number and observe ESD and mains-safety precautions during servicing.
