Hi, The TV has been working perfectly untill I turned it off last night. But, it does not power on any more.and there is no power LED. There is power running thru the cord. Has not had any problems with convergence. If the fault is within the power circuitry and assuming the fuses are ok, what are the other common problems? Few other queations I have are, can the prower transformer be replaced or does the whole power cicuit board need to be replaced. I have replaced convergence ICs in two WS55859 TVs before for a friend and have a basic knowledge of electronics as a hobbyist. Any help is appreciated. Thanks.
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
SOURCE: Mitsubishi WS 55819 with a convergence
CEM-NO, BOTH ICS' WORK ALL 3 CRT YOKES.YOU EITHER NEED TO REALIGN THE RED IN FACTORY CONVERGENCE MODE OR YOU HAVE A RESISTOR THAT HAS FAILED.THE LATTER YOU MAY ACTUALLY BE ABLE TO SEE IF YOU LOOK CLOSELY.OH, ALWAYS DOUBLE CK. YOUR SOLDER CONNCETIONS.GOOD LUCK. JOE TV
SOURCE: mitsubishi ws 55819
Bad convergence ic and should replace caps also
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
caps:
· http://www.chrisandnat.com/Projects/BlinkingTV/blink.htm
· http://www.jeremyburns.com/Mitsubishi-Green-Blinking-Light-Fix.pdf
· http://www.fixya.com/howto/h159332-mitsubishi_dm_board_repair
· http://hdtvoice.com/voice/showthread.php?t=32186
replace DM
SOURCE: Can not align red even though convergence board WS-55819
Did you replace the center board with the STK-392-570 chips or the Digital convergence board mounted on it?
98% of the time if you have a convergence problem it is on the center board---the small board on the left under the metal shield box stores and controls the convergence of this set.
WHICH DID YOU REPLACE?
I am here to help----I have fixed hundreds of Mitsubishi sets with convergence troubles.
Regards, SD TECH
Testimonial: "Helped narrow down where the problem is."
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