Using a PC Monitor as a TV: Why a SCART-VGA Cable Doesn't Work

PC Monitor as a TV: The Adapter Nobody Sells Cheap

A computer monitor is not a television, and no three-euro cable is going to turn one into the other. That's the brutal summary of a question that started in December 2013 and is still relevant a decade later: a reader wanted to use a 20-inch monitor as a TV screen without turning on the computer, using a set-top box he already had at home. The technical answer is uncomfortable: the composite or RGB video signal coming out of a SCART connector and the VGA signal the monitor expects are incompatible. It's not a matter of wiring, it's a matter of electronics.

Why a SCART to VGA Cable Does Nothing

Anyone with a soldering iron and good intentions will first look for a passive adapter. It exists, it's sold, and it's useless. The signal a set-top box outputs through SCART is analog composite video or RGB with TV sync; the one a VGA monitor demands is RGB with separate sync and different levels. A cable doesn't rearrange electrons, it only transports them. For the image to appear, you need an active converter, a device with a chip that rescales and regenerates the signal.

The price of those converters was the first cold shower. VGA Box-type models were around 40 euros at the time of the question, and the cheaper alternatives didn't go below 26.87 euros. The conclusion was blunt: the collar costs more than the dog. A new set-top box with VGA output, on the other hand, could be found for less than 20 euros, which turned the workaround into an exercise in reverse engineering with no economic sense.

The SCART Route and the Orphaned Audio

Some explored a middle path: a set-top box with SCART output, a SCART to RGB component adapter, and from there to VGA. The connection seemed passive in the final stretch, and the adapters were cheap. It was never clear that it worked. The doubt remained hanging, like so many workshop solutions abandoned before being tested.

The sound problem added another layer. Many monitors have no speakers or audio output. The suggested solution was to take the audio from the set-top box's RCA outputs or through a SCART to three-RCA adapter, and connect it to computer speakers. The result: an ecosystem of cables, power strips and switched-on devices just to watch TV. Someone compared it to an electronic castle, and they had a point.

Back to the Problem with HDMI

Years later, the same reader came back with a different scenario: a set-top box with HDMI output and a monitor with an HDMI input. There, things change. The digital signal travels without conversion, and the video should work without drama. Audio remains the weak point: if the monitor has no headphone output, you have to take it from the receiver's RCA outputs or through a SCART to RCA adapter, and connect it to external speakers.

The conclusion of the thread is the usual one: it can be done, but it's not always worth it. A 20-inch monitor with a set-top box, some speakers and a power strip takes up more space and causes more trouble than a new TV of similar price. The cautious prediction is that most of these setups end up dismantled in less than a year, when a TV deal for 60 or 70 euros shows up. The workaround only survives if the monitor is free and patience is infinite.