Piano Companion is a music theory reference app for songwriters, producers, teachers, and students. Look up any of 1,500+ chords or 10,000+ scales instantly, build progressions, and explore harmony on iOS, Android, and Mac.
Whether you're stuck on a progression, blanking on a scale name, or just exploring — Piano Companion gives you the answer in seconds. Press the keys you know, and it tells you what you're playing.
Search by name or tap the keys you know. Piano Companion identifies what you're playing — even from a MIDI keyboard.
The Chord Progression Builder suggests chords that fit your key. Experiment with patterns, listen back, and find what sounds right.
See notes on the grand staff, fingering for both hands, intervals, degrees, and compatible scales — all in context, not abstract textbook diagrams.
The is an indispensable tool for anyone working on Gateway/Acer laptop repairs. By understanding the power sequence and component locations provided in this document, you can reduce repair time and improve accuracy. Always ensure you are using the correct revision (
If you are currently diagnosing a specific failure on this motherboard, let me know when plugged into a power source, or what voltage readouts you have measured on the main power rails so far. I can help guide you directly to the correct troubleshooting steps! Share public link
: Marked physically on the board layers as LM495 MB 11269-2 or under the manufacturing string 48.4XE01.021 / 48.4XE02.021 .
The "Mb 11269-2" seemed to refer to a particular model or revision of a circuit board or a device that utilized the LM495. For those in the know, finding a schematic for such a specific piece of hardware could be the key to repairing, replicating, or even improving upon the device. The schematic, a map of the electronic circuitry, was crucial for understanding how components interacted, diagnosing issues, and ensuring that any modifications or reproductions maintained the integrity and performance of the original design. Lm495 Mb 11269-2 Schematic-- Download
Generates the "always-on" (ALW) power rails required to power the Embedded Controller (EC) before the user presses the power button.
The is the foundational technical blueprint required to diagnose and repair the motherboard used in AMD-based laptops like the Lenovo M495 and Lenovo E4325 . Produced by Wistron, this specific motherboard design relies on a multi-layered complex circuit layout to manage communication between the AMD processor, memory modules, power delivery sub-systems, and peripheral interfaces.
: Multipage blueprints containing structural circuit paths, test-point callouts, and component values. The is an indispensable tool for anyone working
: Integrated AMD processor platform featuring low-power DDR3/DDR3L memory slots.
A less common but critical intermittent fault.
When searching online, use specific file type queries such as "LM495 11269-2 schematic pdf" or "Wistron 11269-2 schematic download" to filter out irrelevant search results. I can help guide you directly to the
Once you have downloaded the , you can perform targeted troubleshooting: 1. No Power / Dead Board Check the charger input connector ( DCINcap D cap C cap I cap N Trace the 19V rail ( VINcap V cap I cap N ) through the MOSFETs. Check the charging IC input ( ACINcap A cap C cap I cap N 2. 3.3V / 5V Missing Locate the Power Management IC ( PWMcap P cap W cap M Check for voltage on the main coils ( PL4101cap P cap L 4101 or similar, depending on the revision). 3. No Display (Power On) Check for RAM voltage. Check BIOS chip pin 8 for 3.3V3.3 cap V Verify LCD connection pinout on the schematic. Conclusion
(Note: Please ensure you have a PDF reader installed. If the link is temporarily down, try searching for "National Semiconductor LM495 Application Note" or "LM495 Boomer Series Datasheet" as a reference.)
Locate the main PWM IC on the schematic. These chips generate the "Always On" voltages required for the Super I/O chip to detect the power button press. If these rails are missing, trace backwards to see if a capacitor is shorted to ground. 2. Power On but No Display (Black Screen)
Don’t risk your motherboard repair. Get the official schematic here:
Piano Companion is a music theory reference app that gives musicians instant access to 1,500+ chords with inversions, 10,000+ scales, a chord progression builder, reverse chord lookup, and an interactive circle of fifths. It is available on iOS, Android, and macOS, and supports 40+ languages. Whether you are a beginner learning your first chords or a professional songwriter sketching ideas, Piano Companion provides the answers you need in seconds.
Tap the piano keys you know on screen or connect a MIDI keyboard, and Piano Companion identifies every matching chord and scale in real time. This is especially useful when you hear a chord in a song but don't know its name — just play the notes and the app tells you what they form.
Piano Companion is free to download on iOS, Android, and macOS. The free version includes core chord and scale lookups. A Pro upgrade unlocks additional features including all chord inversions, the full scale library, the chord progression builder, and the circle of fifths tool.
Yes. Connect any MIDI keyboard to your device and Piano Companion will detect the notes you play, identifying chords and scales in real time. This works on iOS (via Camera Connection Kit or Bluetooth MIDI), Android (via USB OTG), and macOS (via USB or Bluetooth).
Piano Companion is available on iPhone, iPad, Android phones and tablets, and macOS. Your chord libraries sync across devices, so you can start on your phone and continue on your Mac.
Available on every major platform. Start exploring chords and scales today.
