Self-contained summary for context recovery in a new chat branch. This covers only the LG sub-comparison; it assumes the reader has no memory of prior conversation turns.
Russian IT specialist, recently relocated to Niterói, Brazil, setting up a permanent home workstation. Needs a 42–45" 4K display to use as a PC monitor (not primarily as a TV). Buying online specifically to preserve Brazil's unconditional 7-day cancellation right (CDC Art. 49) as a fallback for anything that can't be fully verified pre-purchase.
Background reason for caution: Brazil's ZFM/PPB manufacturing rules mean local SKUs are frequently different hardware from the globally-reviewed "same" model, so foreign reviews/specs cannot be trusted blind — everything must be re-verified against the specific Brazilian SKU.
- Diagonal: 42–45", 43" optimal
- Resolution: 4K UHD @ 60Hz minimum
- Panel type: IPS desired, but VA is acceptable if it clears the other bars (restriction lifted mid-research after evidence that "VA has universally bad viewing angles" is dated — true for entry-tier VA still, less true for flagship WHVA-generation panels, which mostly haven't reached this price tier yet)
- Color accuracy: 100% sRGB desired, ~95% DCI-P3 as an acceptable proxy when sRGB isn't published
- Brightness and contrast: no hard numeric target, but weighed comparatively
- Input lag / response time: hard cap 15ms, under 10ms desired
- HDMI: 2× minimum, 3× desired
- Anti-consumer dark patterns (forced account creation, forced connectivity, ToS-gate bricking risk, forced updates that can brick the unit) are hard dealbreakers, evaluated per-brand/per-OS
- Budget: ≤R$3,000 hard cap, R$3,500 used as a research buffer to avoid missing borderline models
- Nice-to-have: higher refresh rate / VRR / FreeSync — explicitly downgraded by the buyer to "doesn't really matter at a 60Hz panel ceiling, borderline marketing gimmick" once this was understood; not a deciding factor
The buyer manually filtered Zoom.com.br (Brazilian price-comparison aggregator) for 4K, 42–43", ≤R$3,500, and got a list of 15 real currently-listed products across multiple brands. Six of those were LG models. This document covers only the LG sub-set; other brands (TCL, Hisense, Samsung, Philco, Semp) go through a separate comparison round using the same criteria.
These were hard-won across this and prior research and should inform any further model investigation:
- Panel-type "lottery" by screen size: LG (and likely other vendors) sometimes ship the same nominal model name with genuinely different panel technology depending on diagonal — e.g., odd sizes IPS / even sizes VA for some lines. Never assume a spec found for one diagonal applies to another diagonal of "the same" model. Always find data for the exact diagonal in question.
- Similar-but-different model numbers are a trap: "UR8000" and "UR7800" look like they could be the same product with a shortened name, but they are two genuinely distinct LG model lines (different tiers, different specs). Confusing them previously caused a real research error (see UR7800PSA below). Verify model-number families carefully before treating one review as evidence for another.
- Regional suffixes may or may not mean identical hardware: PSA = Brazil, LA = Poland/Europe (confirmed via app-list localization, e.g. Polsat Box Go, TVP VOD), AUA/ZUA = US/Canada, etc. Sometimes these are just labeling differences on identical hardware (confirmed true for LG's UR781C0SA vs UR7800PSA — LG's own support said the only difference is hotel-mode configurability). Sometimes they are not. Treat any spec sourced from a non-Brazilian regional suffix as provisional until corroborated for the actual PSA unit.
- "Professional/commercial" retail-channel SKUs can be identical hardware sold through a different channel (Fastshop, LG B2B) with a different model suffix and often a different price. Confirmed for both AU801C0SA (≈UA7500PSA) and UR781C0SA (≈UR7800PSA, LG-support-confirmed).
- Spec-aggregator sites conflict with each other and are sometimes simply wrong. Real first-hand ownership reports on large, reputable forums (Fórum Adrenaline was the key source here) are stronger evidence, especially when they describe a specific, technically diagnostic symptom (e.g., "black is basically absent" is IPS-diagnostic; a VA owner wouldn't say this) rather than just asserting a panel type.
- A product listing existing ≠ the product being purchasable. Must check explicit live stock status per retailer, not just that a spec page exists. (Lesson learned expensively from the TCL 43P755 in the non-LG round — its listings existed everywhere but it was out of stock everywhere.)
| Nominal SKU | Resolves to | Status |
|---|---|---|
| 43UA7500PSA | Distinct product | Finalist #1 |
| 43AU801C0SA | = 43UA7500PSA (confirmed identical hardware; "Profissional" retail-channel twin) | Not a separate contender |
| 43UA8550PSA | Distinct product | Finalist #2 |
| 43UT8000PSA | Distinct product | Eliminated |
| 43UR7800PSA | Distinct product | Eliminated |
| 43UR781C0SA | = 43UR7800PSA (LG-support-confirmed identical hardware; hotel-mode retail-channel twin) | Not a separate contender |
- Panel: IPS, lab-measured for the Polish/EU "LA" regional variant (not independently confirmed for the Brazilian PSA unit specifically, but inferred safe from a now-consistent pattern across LG's whole Brazilian budget lineup — see UT8000 and UR7800 below, both independently IPS-confirmed via different methods)
- Measured (LA unit): 247 nits brightness, ~1,100:1 contrast, 78–80% DCI-P3, 10ms input lag in PC mode at 4K max refresh, chroma 4:4:4 supported, viewing-angle brightness drop of 68% at 45°
- Processor: α7 AI Gen8 (newest in the LG budget lineup examined)
- OS: webOS 25 (newest)
- VRR: 48–60Hz confirmed (real range, not just "at 60"), ALLM, Game Bar
- HDMI: 3×, VESA 200×200
- Price: R$1,699–1,769
- Stock: confirmed live and well-stocked across 6+ Brazilian retailers
- One useful nuance from the lab review: the aggregate consumer score actually favored a sibling VA variant of the same model line (6.0 vs 5.6) — but that's driven by VA's contrast/HDR advantage for general movie/TV viewing. The review's specific "TV as a computer monitor" preference score favors the IPS variant (6.0 vs 5.4) — i.e., for this buyer's actual use case, IPS is confirmed the right call even in the review that superficially seems to favor VA overall.
- Panel: IPS inferred for 43" specifically, based on a Brazilian reviewer's explicitly stated rule for this exact model line ("43/55/65/75/85 = IPS, 50/60/70/86 = VA") — not independently lab- or forum-confirmed at 43" the way the other three distinct LG products are. This is the one real evidence gap among the finalists, flagged rather than papered over.
- Processor: α7 AI Gen8 — same as UA7500PSA
- OS: webOS 25
- VRR: confirmed via an official-style retailer spec listing (Casas Bahia), though one blog source contradicted this — resolved in favor of the retailer spec
- HDMI: 3× HDMI 2.0, VESA 300×200 (different/larger than UA7500's 200×200 — narrower bracket compatibility)
- Price: R$1,926 — more than UA7500PSA but still cheaper than UT8000PSA despite being the newer/better-specced TV
- Stock: confirmed live across multiple retailers (Zoom, Buscapé, Amazon, Casas Bahia)
- Selected for 2nd over UT8000PSA because it wins on processor generation, price, VRR presence, and stock availability; selected over UR7800PSA for the same reasons plus a full processor generation.
- Panel: IPS, confirmed via Consumer Reports lab review (of the sibling 65" from the same panel family)
- CR lab findings: color accuracy "acceptable, but below that of most models"; contrast "limited... black levels overly bright, worse than many TVs" (~1000:1 implied); brightness 243 nits measured; viewing angle "wide... reasonably good consistency" (its one genuine strength)
- Processor: α5 Gen7 — one generation behind the UA-series finalists
- OS: webOS 24
- VRR: none (confirmed directly by LG's own support team via Reclame Aqui)
- HDMI: 3×
- Price: ~R$2,049 — the most expensive of the group despite being outperformed by both finalists
- Stock: showing scarcity signals (out of stock at Casas Bahia at last check) — looks like it's being phased out in favor of the newer UA-series
- Eliminated because it's simply worse value than both finalists with no compensating advantage.
- Panel: IPS — this required a correction mid-research. It was originally reported as VA based on two spec-aggregator sites (oficinadanet.com.br, kitele.com) and a review of "LG UR8000," which is actually a different, unrelated LG model line (US-market 2023 series) mistakenly treated as equivalent. The correction came from two independent, first-hand ownership reports on Fórum Adrenaline, a large reputable Brazilian tech forum — one explicitly describing using it as a PC monitor with "preto praticamente nem existe" (black basically doesn't exist), a specific symptom diagnostic of IPS, not something a VA owner would report. A third source (ficheirotecnico.com.br) independently agreed with IPS.
- Processor: α5 Gen6 — the oldest processor among all six nominal LG SKUs examined
- OS: webOS 23 (oldest)
- VRR: none (LG-support-confirmed, same source as UT8000's confirmation)
- HDMI: 3×
- Stock: genuinely scarce — out of stock at Casas Bahia, down to a single unit at Amazon at last check. Clear phase-out signal.
- Eliminated because, once the panel-type correction resolved the "why does the pricier/higher-numbered model seem worse" puzzle, there was no mystery left — it's simply the oldest generation in the lineup, offers no advantage over either finalist, and is disappearing from retail.
Finalists advancing to the cross-vendor comparison round: LG 43UA7500PSA and LG 43UA8550PSA.
UA7500PSA is the stronger of the two (cheaper, better-documented, IPS lab-confirmed even if via a foreign regional variant). UA8550PSA is second — same processor generation and VRR, cheaper than the eliminated UT8000 despite being newer, but carries a real, disclosed uncertainty: its IPS-at-43" status rests on an inferred rule rather than direct confirmation.