I have an old notebook which the backlight is not working. In order to know the reason why, it would be interesting to measure the output voltage 'Vout' from the inverter. Unfortunately, there are some technical difficulties to do so:
- The inverter exact specifications is unknown, however the best guess so far is Vout ≈ 650 Vrms @ 50KHz
- The multimeter frequency range is unknown, the manufacturer specifications only mention MAX 750V~
- Is it reasonable to expect Vout ≈ 650 Vrms @ 50KHz? At the lowest dim, this Vout should also be lower?
- Considering the high frequency output from the inverter, is it possible to measure Vout with the aforementioned multimeter?
- Considering that there are no spare parts available for testing, any other idea to check whether is an inverter failure or a screen failure?
Toshiba Satellite 1135-S1553
- Intel® Celeron® 4 processor at 2.20GHz
- Intel 852GM Chipset
- 1Gb RAM
- 32MB internal Integrated Intel® 852GM video memory
- 15.0”TFT active-matrix display; Internal display supports up to 16M colors at 1024 x 768
- 75W external AC Adapter, 100-240V / 50-60Hz frequency (Universal) input voltage, 19V x 3.95A Output
- 8-cell Battery Pack, rechargeable, removable Li-Ion battery, 14.8V x 4300mAh
Digital Multimeter DT830D
- Low cost multimeter which can be used to measure resistant, AC, DC Voltage, DC current, transistor, diode.
- Safety ensure: Overload protection function
- ACV: 200-750V ±1.0%