FAQ
TL;DR: CM801 is 220 pF/1 kV, and S7150 A839 identifies as SEM7150A. "Not any TPS, just the chip is called SEM7150A." This FAQ covers identification, sourcing, and safe substitutions. [Elektroda, Marek09, post #20414095]
Why it matters: This helps TV repair techs quickly identify, source, and replace the S7150/SEM7150A controller on Samsung UE32N4002K power boards without guesswork.
- Correct IC designation: SEM7150A for marking "S7150 A839" (ICM801). [Elektroda, Marek09, post #20414095]
- CM801 capacitor value near the IC: 220 pF / 1 kV, ceramic (blue). [Elektroda, Marek09, post #20414095]
- Approx. cost: ASWO lists the S7150/SEM7150A around PLN 87. [Elektroda, Marek09, post #20395677]
- Workaround proof: a wired adapter board ran stably for 2 weeks at a client. [Elektroda, colorpunkt, post #20656410]
- OB2269 can substitute with re‑mapped pins; it’s not pin‑compatible 1:1. [Elektroda, Marek09, post #19638963]
Quick Facts
- Correct IC designation: SEM7150A for marking "S7150 A839" (ICM801). [Elektroda, Marek09, post #20414095]
- CM801 capacitor value near the IC: 220 pF / 1 kV, ceramic (blue). [Elektroda, Marek09, post #20414095]
- Approx. cost: ASWO lists the S7150/SEM7150A around PLN 87. [Elektroda, Marek09, post #20395677]
- Workaround proof: a wired adapter board ran stably for 2 weeks at a client. [Elektroda, colorpunkt, post #20656410]
- OB2269 can substitute with re‑mapped pins; it’s not pin‑compatible 1:1. [Elektroda, Marek09, post #19638963]
What exactly is S7150 A839 (ICM801) on the UE32N4002K power board?
It’s the SEM7150A, a PWM controller used on this Samsung board. The S7150 marking corresponds to SEM7150A. This clarifies earlier confusion with other parts. Identify it by the S7150 A839 top mark and surrounding PWM circuitry. [Elektroda, Marek09, post #20414095]
Is the S7150 actually TPS7150?
No. "Impossible, it's a PWM driver." TPS7150 is a linear LDO and does not match the function required here. Use SEM7150A instead to restore PWM control. This avoids ordering the wrong regulator IC. [Elektroda, zbyszekskibinski, post #19706977]
What value is the blue CM801 capacitor near S7150?
CM801 is 220 pF and rated 1 kV. It is a ceramic capacitor, typically blue on this board. Replace with the same value and voltage rating if missing or damaged. This value is confirmed by an experienced member. [Elektroda, Marek09, post #20414095]
Where can I buy the SEM7150A/S7150 and what does it cost?
ASWO lists the part around PLN 87. Availability can vary, so check stock before ordering. This price point is a good benchmark when comparing other suppliers. [Elektroda, Marek09, post #20395677]
Can I use OB2269 as a substitute for SEM7150A?
Reports indicate OB2269 can work when you re-map its pins. "Pins probably do not match 1:1, but they wrote that it works." Expect to adapt the wiring rather than a drop‑in swap. Verify each pin function before powering up. [Elektroda, Marek09, post #19638963]
How do I wire a replacement controller on a small adapter board?
Build a tiny daughterboard and connect it to the original pads with short wires. Keep the leads tidy and insulated to prevent shorts. Secure the board mechanically so vibration won’t stress solder joints. This approach has been field‑tested. [Elektroda, colorpunkt, post #20656410]
Has a field-tested workaround been confirmed to hold up?
Yes. A technician reported the TV ran for 2 weeks at a client after a wired-board modification. That confirms short‑term stability under normal use. Document your wiring so future service remains clear. [Elektroda, colorpunkt, post #20656410]
What does S7150/SEM7150A drive on this Samsung board?
On this chassis, ICM801 marked S7150 acts as the driver for the MMIS60R580P inverter transistor. Use that mapping when tracing the power stage. It helps confirm you’re on the correct control circuit. [Elektroda, dudi2003, post #18291712]
Is there a complete solution thread I can follow for this fix?
Yes. A member posted a solution and linked it in the discussion. Follow that referenced post for their exact approach and notes. It complements the wiring method described here. [Elektroda, colorpunkt, post #20656262]
How can I verify the IC identity before ordering a replacement?
Compare the application around the IC with known controller topologies. "Compare the application with what is on the disc." Trace pins to the MOSFET gate drive, VCC, and feedback network to confirm PWM controller behavior. [Elektroda, ada_m, post #18291929]
What goes wrong if you misidentify the controller?
Repairs can stall. One technician kept the unit pending for several months while the exact system remained unresolved. Correct identification saves time and avoids ordering unsuitable parts. [Elektroda, videotecnic, post #19636761]
What exact marking should I look for on the chip?
Look for S7150 A839 on the package at ICM801. That marking is the board-level clue that maps to SEM7150A. Photograph the area before removal to preserve orientation. [Elektroda, dudi2003, post #18291712]
Where can I see a reference photo of a successful wired mod?
A technician shared a photo of the board with the adapter wired in. While the set is now with the client, the image shows the layout and lead routing. Use it as a visual guide. [Elektroda, colorpunkt, post #20656410]
