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Relay clicks, no power 46EX3B Hitachi 1993   Goto page 1, 2  Next  
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troubleshootn



Joined: 24 Feb 2009
Posts: 6
Location: hickory nc

PostPosted: Sun Mar 01, 2009 4:01 pm    Post subject: Relay clicks, no power 46EX3B Hitachi 1993 Reply with quote

1993 hitachi 46ex3b projection

I hit the power button the relay clicks on supplys voltage all across the board, it checks at 120 volts at the first set of fuses drops to 65volts at sum type of resistor, then drops to 35 volts on pretty much the rest of the board. There is 35 volts on all the crt 's with power on, i checked the voltage at iso901 STR-M6511 its at 65 volts I was told this could be a possible problem, but I have no idea what test is needed to check the part or if this is even the problem???? Has anyone ran into this problem im sure it is simple, but my limited knowledge in the area is not helping.

Any help would be great.

Thanks Caleb
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Sun Mar 01, 2009 5:09 pm    Post subject: Reply with quote

Let's hope you're referencing the "correct" ground for the different points you are measuring (Hot/Cold).
troubleshootn



Joined: 24 Feb 2009
Posts: 6
Location: hickory nc

PostPosted: Mon Mar 02, 2009 7:55 am    Post subject: prob not Reply with quote

Ok this will prob show my ignorance, but all grounds were checked at the power leads coming into the board, I grounded my tester at the neg of the wall plug coming into the board, then checked voltage on all kinds of places have no clue what Im doing. I was more hoping someone knew of a tsb or related problem who may have an answer or at least tell me which direction to head in???? But from the power source to most of the board is 35 volts
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Mon Mar 02, 2009 2:24 pm    Post subject: Reply with quote

The "Primary" of the set's Switched Mode Power Supply (SMPS) uses a "Hot" ground reference (i.e. main filter "-" / Raw B-Plus Bridge rectifier "-").
The secondary of the SMPS uses a "Cold" ground as its reference (i.e. Tuner cover).
If you try to measure a point in the set that is supposed to be referenced from a Cold ground from a Hot ground instead, you will get a erroneous reading.
troubleshootn



Joined: 24 Feb 2009
Posts: 6
Location: hickory nc

PostPosted: Tue Mar 03, 2009 9:29 am    Post subject: Reply with quote

Ok makes sense, but getting back to my original problem what are some possible causes for the symptoms My set is having??

Hit the power button hear the relay click once but does not turn on??

I obviously have power throughout the board so what gives???

Something isnt turning the crts on???
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kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Tue Mar 03, 2009 9:51 am    Post subject: Reply with quote

This may upset you. But I'll say it anyway.

I stopped reading your first post when I couldn't understand through all the run-on sentences. You should try to make it easy for people to help you.
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Tue Mar 03, 2009 1:17 pm    Post subject: Reply with quote

Since this is now your second thread about the SAME television, did you ever try changing the regulator (STR-M6511) as was previously suggested?
troubleshootn



Joined: 24 Feb 2009
Posts: 6
Location: hickory nc

PostPosted: Wed Mar 04, 2009 7:45 am    Post subject: Reply with quote

Maybe if I talk in Robot it would help.

Reg did nothing
Jesse Mack



Joined: 22 May 2008
Posts: 600
Location: The Last Frontier

PostPosted: Wed Mar 04, 2009 11:37 am    Post subject: Reply with quote

Hi Caleb,

Yes, ROBOT would help. After all, Is not help what you are asking for?? (:>)

These are the parts of concern:

Q902: Part number 2323782 SCR (Silicon Controlled Rectifier)
CP902: Part number 2793312 Caprister
IC901: Part number 2373343 Regulator
ZD904: Part number 2334304 Zener Diode
R922: Part number 0700023 Resistor (47 Ohm 1/16Watt Carbon)

All except resistor is available here: http://www.encompassparts.com

You should be able to acquire the resistor from Radio Shack

Smile Caleb, If you do not know what some of these things are, at least know that one of these things are what has most likely failed for this chassis.

Hope this helps

Jesse
kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Wed Mar 04, 2009 2:42 pm    Post subject: Reply with quote

troubleshootn wrote:
Maybe if I talk in Robot it would help.


That depends... Do robots use punctuation in between sentences?

Domo Arigato, Mr. Roboto
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