[mdlug] Laptop repair question

[Aaron Kulkis]

Raymond McLaughlin wrote:
> Aaron Kulkis wrote:
>> Ingles, Raymond wrote:
>>>> From: Raymond McLaughlin
>>>> Rather than the flash lamp itself I would consider that it could be
>>> the
>>>> voltage converter/regulator module that has failed. This is very
>>> common,
>>>> and can be easily replaced as it it a snap in, in line part.
>>>  Is there any way to tell the difference before opening it up?
>>>
>> Voltage meter.
> 
> Two word of caution. These flash lamps often take a surprisingly high
> voltage, and the presence of a voltage does not necessarily indicate how
> the part will work under load.
> 

True.  I wouldn't be surprised if the voltage was stepped up
into the 1 kV range.  When measuring voltage, always start
with the meter at very high range and dial down until you get
significant readings.

The Cold Cathode tube *might* have the voltage & current
specs printed right on it.

> Clearly detailed documentation on the part, and the whole circuit, would
> help.