Another TV Repaired!
This Freegle donation is a 32-inch JVC Smart television with LED backlight. The set was powering up, but no picture, so the backlight was suspect. The very bright torch trick revealed a picture lurking in the murk, so the set was worth repairing. The power supply was putting out 94-volts to the backlight which seemed excessive, but before I could investigate further I managed to short something and the output dropped to just 30-volts. I decided to take a chance on a replacement power board off eBay and while that was on its way I dismantled the television to take a look at the LEDs. The diode test setting on my DMM (digital multi-meter) was reading open-circuit, but across a lot of LEDs this doesn't always mean anything. Carefully taking the thing apart and putting the LCD panel to one side, I discovered that there were 22 LEDs, but one had already been removed and soldered over so someone had previously tried repairing the set. The problem with this shorting-out approach is