LG TV repair in Riga — SATER

LG is the leading OLED TV manufacturer, and most modern LG OLED panels are built on WOLED technology (white OLED plus colour filters). The two most common OLED problems we see at Silmaču iela are image retention / burn-in and vertical banding. Burn-in typically appears after long exposure to static HUD content — channel logos, game interfaces (PS5 FIFA, CoD minimap), 24/7 news tickers. LG’s built-in Pixel Refresher runs every 4 power-offs and rebalances individual subpixel characteristics, but once degradation is far enough along, it no longer helps.

Vertical banding is a different story. It appears when the compensation IC and T-CON compensation maps can no longer equalise subpixel characteristics across the panel. You see it as darker or lighter vertical stripes on grey scenes — a football pitch is the classic example. This is physical degradation and cannot be "patched" in software.

When a customer brings in an LG OLED C, G or B series with burn-in or banding, we first determine precisely whether the issue is in the panel itself or on the T-CON board. A failed T-CON (vertical lines, half-screen missing) can be repaired at a sensible cost. If the OLED matrix itself has worn — we say so honestly: a new panel will cost more than a new TV of the same model. We do not take a customer’s money for work that makes no economic sense.

LG mainboards use an eMMC flash chip that stores the webOS operating system, settings and user data. After 3–5 years of use the eMMC starts to wear out — read/write errors accumulate, sectors become unreadable, and the TV either drops into a boot loop (endless LG logo), hangs during startup, or behaves strangely once it does boot (settings are lost, smart features stop working). This is the single most common fault on LG UJ63xx, UK63xx and UM74xx sets.

Our approach is component-level. First, via the ISP (In-System Programming) port or directly on the eMMC pads, we read the flash contents and analyse the error rate. Then we either rewrite a correct webOS firmware image, or, if the chip is dead, we physically reball it with a hot-air station and fit a new, pre-programmed BGA. After the repair the TV boots webOS normally, retains settings and runs without spontaneous restarts.

Beyond eMMC we also repair other mainboard faults — blown HDMI protection diodes (HDMI 1 and HDMI 2 eARC are the most frequent casualties), Wi-Fi module failures (Broadcom and Realtek modules on webOS 5 and 6 drop connection), IR receiver failures and capacitor replacement in the SoC power rails. Most of these jobs are completed within 2–5 working days.

LG NanoCell and UHD models use a conventional LCD panel with LED backlighting (Direct LED or Edge LED), unlike OLED. The typical fault on these sets is failure of the LED bars (LED strips): after 3–6 years one or more LEDs on a single bar burn out, and because the LED driver runs the strings in series, the whole chain goes out. The result is a dark half of the screen, or the TV powers up but the picture is very dim or missing entirely while the sound still works.

Replacing LED bars requires a full panel strip-down — we remove the bezel, the LCD matrix, and the diffuser layers together with the optical films, to get to the LED bars themselves. We then swap the failed strips for new ones, check the LED driver rails and reassemble everything. This job demands a very careful hand — any optical film put back slightly wrong will leave clouding or shadows on the screen.

On QNED MiniLED sets (QNED90, QNED99) the situation is more complex — the LEDs are much smaller and organised into local dimming zones, and replacing a single module requires not just the physical work but also recalibration of the dimming zones. That is why, on QNED MiniLED repairs, we always first determine whether the fault is in the LED bars themselves, the LED driver board, or the T-CON — each has its own repair strategy and price. Diagnostics are always performed on-site at Silmaču iela 6, and the customer receives an honest estimate before the work begins.