Sony TV repair in Riga — SATER

Sony has used an elegant self-diagnostic system for many years: if the TV fails to start normally, the red standby LED flashes a specific number of times, pauses and repeats the cycle. That cycle is the error code, and it lets us aim diagnostics at the right subsystem instead of probing the whole board. Two blinks normally mean a power supply fault — no standby rail or a PFC error. Three blinks indicate an LED backlight current fault or the LED driver board (BD board) tripping its protection. Four or five blinks point at T-CON and the LVDS signal, six at the main mainboard, seven and eight at tuner and audio.

In practice it works like this. The customer reads us the code on the phone and we already know what to bring to the diagnostic: scope, spare PSU capacitors, an LED current meter. Once we open the TV we first check whether the PROT protection rail has gone active and which side the fault is coming from. Sony self-diagnostics are accurate but they point at a direction, not at a specific part — for example, "three blinks" can be a dead LED strip, its driver IC, or just an open connector. We eliminate one cause at a time: disconnect the LED load, measure rails, probe every channel.

With the latest XR mainboard generation diagnostics has become more complex — a lot of errors now live in software and must be read from Service Mode. We know how to enter Sony Service Mode on KD and XR sets, pull the error log and, where needed, reset counters after a parts swap. That is exactly the component-level work we have been doing at Silmaču iela 6 since 1993.

The Sony XR Cognitive Processor is the foundation of every new BRAVIA — A80, A90, A95, X90, X95 and up. It combines picture processing, audio processing and the Google TV operating system in one SoC that sits on the mainboard alongside DDR memory and eMMC flash. The eMMC is the part that tires first — Google TV constantly writes logs, updates and app cache, and after three to five years of heavy use the memory blocks start to fail. Symptoms: the Sony logo freezes on screen, the TV reboots endlessly, menus take minutes to load, or the set never gets past the "Preparing Android TV" screen.

Our workflow is this. First we confirm that the problem is not power or T-CON — otherwise an eMMC swap would fix nothing. Then we lift the eMMC off the board with hot air, put it into a programmer and try to read the original firmware. If the chip still responds we dump the image, clean the bad blocks and write it back. If the chip is dead we fit a new BGA package and flash the matching Sony firmware from our archive or from an identical donor set.

While the board is out we often also check the HDMI 2.1 inputs. The X90J, X90K and X90L are known for HDMI handshake issues with the PlayStation 5 in 4K@120 Hz mode, where the picture suddenly drops out or the colour space flips to the wrong YCbCr setting. The cause is usually a failed HDMI input IC or an open TMDS line — we replace the chip, verify the eARC return path to the receiver and recalibrate. Finally we reflash the firmware and test every port with a real 4K@120 source. Every repair is backed by our 3-month warranty.

Sony A-series OLED televisions — A1, A8, A80J, A90J, A95K and A95L — are unique in that the screen itself is the speaker. Acoustic Surface technology uses two or three actuators with small eccentric coils to vibrate a glass plate bonded to the OLED panel, creating sound directly from the picture. It sounds great, but it also causes failures that do not exist on any other TV family.

The most common case is sudden loss of sound, or very quiet and distorted audio, while the picture is perfect. The first thing we do is open the back and find the sound board, which usually lives under the main power supply. On it sits a dedicated Class-D audio driver IC that drives the actuators with around 10–30 volts. That IC runs hot and can fail over time — we replace it on the board. We also check and replace power capacitors on the sound board, which often dry out because of the OLED heat nearby.

The second classic problem is a green or pink tint on A80J and A90J after warm-up. That is not the panel, as many owners fear; it is a Compensation Cycle issue — OLEDs run an automatic compensation routine, and if that cycle is interrupted the gamma saves incorrectly. We enter Service Mode, force a Panel Refresh and a long Compensation Cycle, and recalibrate the RGB outputs. In the majority of cases the picture comes fully back to normal.

Let us be straight up front: we do not swap panels. A new Sony OLED panel costs almost as much as a new TV, so it is not an economically sensible job. But in practice about 80% of what owners initially call "a dead panel" is actually the sound driver, T-CON, power capacitors or firmware — and all of those we do repair at Silmaču iela 6. For diagnostics please call ahead on +371 67377002.