Background: I've been asked to "have a look" at a family members LCD TV. It's a small 17" Toshiba and a first look at their house suggested the external power brick had fried. The brick is rated at 12V / 7A. Having taken the thing home, I had a tinker last night and tried running the TV from an old AT power supply. This is has a sticker on the side wich claims it'll provide 12Volts at 10A - sounded promising. When I hooked it up (jerry-rigged, natch!) I did get some life: The sound crackles a bit and the TV comes out of standby, but the backlight doesn't fire up - though you can see, very dim "static" on the screen. Sounded a lot like a fried inverter. Out of interest, I checked the voltage coming out of the power supply. Off load it measured 10.6V. When the TV was on standby I got 9.5V and when the TV was "on", the supply dropped to
7.7V (which may not be enough to fire up the backlight inverter).However, I was rather taken aback by the voltage drop. The TV spec. says it pulls a maximum of 55Watts - so it does appear that this PSU can't get anywhere near the 10A it claims. I'm off to try another PSU tonight, but until then the question is: should I get such a high drop for what is supposedly well within the PSU's capacity?