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Hitachi Projection T.V.
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joefire



Joined: 06 Mar 2008
Posts: 6

PostPosted: Thu Mar 06, 2008 12:14 am    Post subject: Hitachi Projection T.V. Reply with quote

Hitachi 57twx20b no picture ,sound fine all leds are lit up not blinking I have service manual and started to check i902 at term 4 . Has anyone seen this problem?
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Thu Mar 06, 2008 10:39 pm    Post subject: Reply with quote

Are the tubes lit?
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joefire



Joined: 06 Mar 2008
Posts: 6

PostPosted: Thu Mar 06, 2008 10:56 pm    Post subject: Reply with quote

what are you referring to ? The lamps?
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minnie



Joined: 18 Aug 2005
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Location: Hell

PostPosted: Fri Mar 07, 2008 12:37 am    Post subject: Reply with quote

Yes. The red blue green tubes.
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PostPosted: Fri Mar 07, 2008 5:02 am    Post subject: Reply with quote

I don't think they are. This set was working fine , then picture blinked off for a second and then it cut out completely. Day later picture would stay on for aprox. 20 min. and cut out. The red led does not blink protection . I have been following flowchart for no raster .
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Fri Mar 07, 2008 4:09 pm    Post subject: Reply with quote

CHECK IH01, HIGH VOLTAGE DRIVER
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joefire



Joined: 06 Mar 2008
Posts: 6

PostPosted: Sat Mar 08, 2008 12:56 pm    Post subject: Reply with quote

Minnie I checked voltages on IH01. Readings are as follows:
    1=10.08v,2=11.62v,3=0v,4=2.47v,5=1.59v,6=10.5v,7=0v,8=0v,9=.027v,10=.041v,11=.041v,12=4.94v,13=.055v,14=2.02v,15=4.9v,16=0v . This part looks like a prom from an automotive computer. According to a voltage table I have on page 77 of the manual, the voltages are way off. What do you think?
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sat Mar 08, 2008 4:38 pm    Post subject: Reply with quote

The high voltage divider is the black thing with three leads going to each picture tube.
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joefire



Joined: 06 Mar 2008
Posts: 6

PostPosted: Sat Mar 08, 2008 5:15 pm    Post subject: Reply with quote

yes I know where that part is, how do you test that and what about Iho1?
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sat Mar 08, 2008 6:59 pm    Post subject: Reply with quote

Forget the ic for now. Unplug one of the leads from the splitter and listen for arching. The true why would be with a high voltage probe.
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