What is the voltage of transformer of crest audio vs450

The LG VS450 is a 3G only phone. No apps or upgrades will change this. You need a new phone capable of 4G and a wireless provider in your area that offers 4G service.

Just pull the installed fuse out and look at the voltage printed on the side of it if that information isn't already printed by the fuse holder. Should be 110-120 volt. Just make sure it's not a slo-blo or some other type

Dust in the unit - clean with Canned air like a computer.

or Delamination on the printed circuit board.
Don't forget to clean all contacts on the backside of the unit!

If cleaning doesn't work - head to the local Crest "AUTHORIZED" Service Center.

try AE.... in Schagen, Netherlands they build new transformers and did a good and cheap job on my PT

Yes, you need a step down transformer. These are often rated in watts (the power rating is the same on both sides of a transformer) so it is easy enough to match this with the power consumption of the stereo. Apparently you will need about a 4kW transformer eg

http://www.220converters.com/store/p/45-Simran-THG4000-4000-W-Watts-Step-Down-Voltage-Converter-220v-to-110v-Transformer.html

Ugly things.

Hello folks,
The same thing happening with my crest cc4000. The plastic connector, connecting the wires from the transformer to the circuit board was burnt damaged and was removed. but acl light still stays on and amp not active.

You could use the EQ but it won;t sound as good as it will with a pre amp and also could make it a bit trickier when adjusting the volume and getting it to sound right.

First of all the 70 volt line is used when we are dragging long lengths of speaker wires. hence to counter the drop we use a high voltage line brring it further down without any remarkable drop and use a step down matching transformer to power the speaker according to the impedance of the speaker to the secondary of the transformer. Connect the 70 volt to the 70 volt output in the amplifier. Now connect the other end of the wires tto the primary of the 70 volt transformer. Use the secondary output to connect to the speaker using the tap most suitable..2, 4,6,8 ohms . Check the phasing when you connect or reverse if the bass quality is less.
Hope this helps. Good day

disconnect you load (speakers) power amp up. If this fault persists there might be a problemm with the amp

I am not sure what you are trying to do, I did find two sites that have diagrams and spec sheets.

http://img3.musiciansfriend.com/dbase/pdf/spec/481640.pdf

http://www.crestaudio.com/assets/literature/manuals/CFA-CA9-AB_7719.pdf

These are Adode files.