 | 
|
|
Posted by Claude Moore (172.138.195.66) on August 27, 2003 at 12:20:00:
In Reply to: Re: Help - Mitsubishi Big Screen TV - Model VS-5004R posted by parker on February 13, 2003 at 14:29:07:
: :i just got mine fixed. the reason it worked w/ unplugging it for a while then restarting is because it is the power supply.it isn't getting the hi fequency's to turn the tubes on. if you had sound 7 no picture before hand this would be a positive. if there is no sound then it's fried all over more than likely & you need a new power supply. if you have a good technician he can rebuild it . @ $ 200.00. hey it's cheaper than a new big screen!!!
:
: : Does any one have experience with Mitsubishi Big Screen TV fixing the power problem I think ?
: : : I verified al fuses; OK. When press remote to turn the power I hear few clicks no picture and no sound.
: : : Few months ago I experienced similar problem when I removed the wall plug for few days and then plugged it back to my surprise the TV started working. Now the same trick is not working.
: : : Any recommendation is appriciated ?
: : : Regards,
: : : R. Rajan
: : It's very difficult to say what may be the cause on that shit.
: : First of all check the ac-plug on the wall! the cord and the connection to the supply.
: : Check the fuses again.Sometimes ,because of high voltage overload, the transistor in the chopper circuit, gives a nice shortcircuit between the emitter and the collector .That usually burn a fuse.
: : Check the horizontial oscillator circuit
: : Check the rectificaton circuit(bridge etc.)
: : Chexk the overload protection circuit
: : Check power electronics elements (such as thyristors etc.)
: : check the solder in the elements feet(do they connect to the printed board?)
: : Good luck
: : G.Sar
You have a common problem with the power supply system in your set.. it has been my experience that a combination of power supply components can be weak or leaky as it is called contact me via e-mail and i can help with the problem... ps i have 27 yrs. in the repair business
|