Hitachi Ultra Vision 61UWX10BB Will not power up Red led flashes
Can some one help? I replaced the IC's with STK-150's and tv powered up and worked but turned off with in 3 mins. Now I am back to the orginal problem, power led flashed 4 times and will not power up. Blank screen with no sound. I removed the red, green, and blue wire connectors to the Convergence board but no change. Why did the IC repair make the tv work for 3 mins? Thanks, Shawn
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Re: Hitachi Ultra Vision 61UWX10BB Will not power up Red...
Your repair didn't address the failure.
It is much more likely (in the absence of video and sound) that the power supply has failed.
The items you replaced affect convergence and have nothing to do with the audio section or the set's ability to receive signal.
The power supply failure will diasable everything.
Look for a separate board with larger-than-average components, some cylindrical (capacitors), some block-shaped (chokes and transformers).
And you may be able to recognize its relationship to the AC input line.
Locate the assembly number which may be on a paper label or just printed in ink on the board; any that appear to have been part of the etched traces will be only the empty board number, not the assembly.
Removing and replacing this assembly can be done by most everyone using a little common sense and just plugging in the connectors where they belong.
Call your Hitachi service center and ask about potential repair or replacement costs.
If you can score a new board, don't throw away the old one since the new board will be as crappy as the original.
This way, you will have time and opportunity to find an independent reapir service for these and have a spare on hand for . . . sorry, the next failure.
These things aren't 'your father's TV', they die much more often.
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Technician (only for users in the US for now) and get all the help you need. Goodluck!
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Alot of techs recommend using the higher wattage ICs to replace the stock ones, which is never a good idea since the resistors get stressed. Upgrading to the STK394-160 IC is the only upgrade Hitachi recommends but then the values of the resistors need to be changed since the stock resistors will not work with the upgraded ICs
Try adjusting the convergence. If it won't move see below- (or hitting Magic Focus for some Hitachi’s) This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually $200-$400 Be sure to vote/rate me if this helped Thanks! See link for more detail http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html
The 392-150 is a higher current device then the 110---you can use either--this is normal in the hitachi sets---I usually replace both with 150's---check the led that does not light---should indicate which voltage source is bad---if it is one of the 2 voltages for the convergence ic's(one is a positive and the other a negative voltage) then the convergence Ic's may be bad---look for any discolored resistors around the ic's---one way to tell if it is a convergence ic is to de-solder both ic's and see if the set turns on(the convergence will be out the window) but if it comes on change both and do the alignments with the Hitachi remote. By the way----the led should have a location number printed on the top of the circuit board.
This tv have different causes for no power.
Can you tell me if any light on the chassis is off?, if so, let me know the location part number.
Common problem is IC output ( short) or convergence STKs ICs.
Your message says you "replaced stk392-150", did you replace both of the stk`s or just one of them??? One is for RGB vertical the other is for RGB horizontal, you should always replace both stk`s as a set, Hitachi recommends you use a "replacement kit"
part number X480306", this kit includes both stk`s with a new & supposedly improved set of stk`s as well as all resistors that are required for proper set-up, they strongly recommend you change all of the parts in their kit. The only other thing besides IC`s & resistors that could cause your problem is:
1) bad dcu output (you need a scope to check this)
2) you`ve lost either the +15 volt line or the -15 volt line to the IC`s, "Fxxx" chemical fuse open in power supply.
Most likely have a regulator problem. Remove
rear cover, look down on the main chassis, turn
tv on watch the board to have some colored led's
lit, usually a red one and couple of green. If the
red is out, its your regulator, if a green one
other problems off the circuit with green led
are causing the tv not to power up.