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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Hitachi Power Problem
I have a hitachi model 50ux19k Rear projection TV.When i push the power
botton the relay engages but the power light will not come on and the tubes do not light.I have electronic repair experience on sound sys.Two years ago the tubes were replaced professionally.Is there a watchdog circuit or overcurrent protection in the PS.I have a digital meter but do not own a Scope.Any fairly simple solutions such as B+ Adj. |
#2
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Hitachi Power Problem
Google is your friend. Just google 50ux19k dead. Look here. Dani.
http://www.google.ca/search?hl=en&q=50ux19k+dead&meta= bobjukebox wrote: I have a hitachi model 50ux19k Rear projection TV.When i push the power botton the relay engages but the power light will not come on and the tubes do not light.I have electronic repair experience on sound sys.Two years ago the tubes were replaced professionally.Is there a watchdog circuit or overcurrent protection in the PS.I have a digital meter but do not own a Scope.Any fairly simple solutions such as B+ Adj. |
#3
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Hitachi Power Problem
Even registration problems on these sets will cause a protect shutdiwn.
Defective convergence ics, etc. "Dani" wrote in message oups.com... Google is your friend. Just google 50ux19k dead. Look here. Dani. http://www.google.ca/search?hl=en&q=50ux19k+dead&meta= bobjukebox wrote: I have a hitachi model 50ux19k Rear projection TV.When i push the power botton the relay engages but the power light will not come on and the tubes do not light.I have electronic repair experience on sound sys.Two years ago the tubes were replaced professionally.Is there a watchdog circuit or overcurrent protection in the PS.I have a digital meter but do not own a Scope.Any fairly simple solutions such as B+ Adj. |
#4
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Hitachi Power Problem
Art were do i start looking
Art wrote: Even registration problems on these sets will cause a protect shutdiwn. Defective convergence ics, etc. "Dani" wrote in message oups.com... Google is your friend. Just google 50ux19k dead. Look here. Dani. http://www.google.ca/search?hl=en&q=50ux19k+dead&meta= bobjukebox wrote: I have a hitachi model 50ux19k Rear projection TV.When i push the power botton the relay engages but the power light will not come on and the tubes do not light.I have electronic repair experience on sound sys.Two years ago the tubes were replaced professionally.Is there a watchdog circuit or overcurrent protection in the PS.I have a digital meter but do not own a Scope.Any fairly simple solutions such as B+ Adj. |
#5
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Hitachi Power Problem
Check the + & - supplies to the convergence circuit, even with protect
shutdown you should measure a bit of the supply to these areas. Disconnecting the supply to the STK ICs will unload the power supply, if that is the problem. Even though the set is going into protect you should measure a bit of change on the + & - 25 volt supplies. Check for any open chem fuses, they look like small grey tor tan resistors with numbers printed on them, (5000) indicates 5 amp, etc. Follow the google search, if totally in doubt, have the set professionally looked at. "bobjukebox" wrote in message oups.com... Art were do i start looking Art wrote: Even registration problems on these sets will cause a protect shutdiwn. Defective convergence ics, etc. "Dani" wrote in message oups.com... Google is your friend. Just google 50ux19k dead. Look here. Dani. http://www.google.ca/search?hl=en&q=50ux19k+dead&meta= bobjukebox wrote: I have a hitachi model 50ux19k Rear projection TV.When i push the power botton the relay engages but the power light will not come on and the tubes do not light.I have electronic repair experience on sound sys.Two years ago the tubes were replaced professionally.Is there a watchdog circuit or overcurrent protection in the PS.I have a digital meter but do not own a Scope.Any fairly simple solutions such as B+ Adj. |
#6
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Hitachi Power Problem
Thanks Art however i have been unable to find a schematic on ESI , any
other sites that you can think of.I did download a repair bullitin but could not open it with adobe.Do you know what progam they are using. Art wrote: Check the + & - supplies to the convergence circuit, even with protect shutdown you should measure a bit of the supply to these areas. Disconnecting the supply to the STK ICs will unload the power supply, if that is the problem. Even though the set is going into protect you should measure a bit of change on the + & - 25 volt supplies. Check for any open chem fuses, they look like small grey tor tan resistors with numbers printed on them, (5000) indicates 5 amp, etc. Follow the google search, if totally in doubt, have the set professionally looked at. "bobjukebox" wrote in message oups.com... Art were do i start looking Art wrote: Even registration problems on these sets will cause a protect shutdiwn. Defective convergence ics, etc. "Dani" wrote in message oups.com... Google is your friend. Just google 50ux19k dead. Look here. Dani. http://www.google.ca/search?hl=en&q=50ux19k+dead&meta= bobjukebox wrote: I have a hitachi model 50ux19k Rear projection TV.When i push the power botton the relay engages but the power light will not come on and the tubes do not light.I have electronic repair experience on sound sys.Two years ago the tubes were replaced professionally.Is there a watchdog circuit or overcurrent protection in the PS.I have a digital meter but do not own a Scope.Any fairly simple solutions such as B+ Adj. |
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