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Hitachi 46EX3B no video or Audio    
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gcloer



Joined: 26 Dec 2009
Posts: 4

PostPosted: Sat Dec 26, 2009 5:10 pm    Post subject: Hitachi 46EX3B no video or Audio Reply with quote

Picked this thing up cheap a few months ago. Was working fin e until the other day. Now I can turn it on, I hear a click like the relay is pulling in but it never displays anything. I don't hear any sound either. After reading through some other posts I was sure it was IC901= STRM6511. I replaced it but still have the same results. I'm not sure what to check now. Anyone got any ideas?
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gcloer



Joined: 26 Dec 2009
Posts: 4

PostPosted: Tue Jan 05, 2010 11:21 am    Post subject: Reply with quote

Checked and I'm not getting anything on the high voltage side. Anyone got any suggestions?
kuhurdler



Joined: 28 Dec 2006
Posts: 2855
Location: Overland Park, KS

PostPosted: Tue Jan 05, 2010 2:39 pm    Post subject: Reply with quote

test the horizontal output transistor
gcloer



Joined: 26 Dec 2009
Posts: 4

PostPosted: Tue Jan 05, 2010 2:41 pm    Post subject: Reply with quote

Any idea what the IC # would be?
JTS1957



Joined: 21 Jan 2009
Posts: 2323
Location: Far, Far Away

PostPosted: Wed Jan 06, 2010 2:58 pm    Post subject: Reply with quote

What about CP902 and ZD904.
Do you mean secondary side of transformer that IC901= STRM6511 feeds?
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gcloer



Joined: 26 Dec 2009
Posts: 4

PostPosted: Thu Jan 07, 2010 6:44 am    Post subject: Reply with quote

I don't seem to be getting anything out of the flyback transformers.
I'll check CP902 and ZD904 and let you know what I find.
JTS1957



Joined: 21 Jan 2009
Posts: 2323
Location: Far, Far Away

PostPosted: Thu Jan 07, 2010 8:38 am    Post subject: Reply with quote

Are you getting secondary (B-Plus) voltages out of the SMPS?
Jesse Mack



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

PostPosted: Thu Jan 07, 2010 11:48 am    Post subject: Reply with quote

If the Relay that clicks is RL901, the probable failure is:

Q902 Transistor
R922 Resistor
ZD-904 Zener Diode
CP-902 IC Protector
IC901 - Regulator

Since you have replaced the regulator, all of the rest can be checked with a DVM.

Hope this helps

Jesse
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