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joefire
Joined: 06 Mar 2008
Posts: 6
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 Posted: Thu Mar 06, 2008 12:14 am Post subject: Hitachi Projection T.V. |
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| 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
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| Posted: Thu Mar 06, 2008 10:39 pm Post subject: |
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| Are the tubes lit? |
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joefire
Joined: 06 Mar 2008
Posts: 6
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| Posted: Thu Mar 06, 2008 10:56 pm Post subject: |
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| what are you referring to ? The lamps? |
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minnie
Joined: 18 Aug 2005
Posts: 2877
Location: Hell
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| Posted: Fri Mar 07, 2008 12:37 am Post subject: |
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| Yes. The red blue green tubes. |
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Guest
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| Posted: Fri Mar 07, 2008 5:02 am Post subject: |
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| 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
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| Posted: Fri Mar 07, 2008 4:09 pm Post subject: |
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| CHECK IH01, HIGH VOLTAGE DRIVER |
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joefire
Joined: 06 Mar 2008
Posts: 6
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| Posted: Sat Mar 08, 2008 12:56 pm Post subject: |
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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
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| Posted: Sat Mar 08, 2008 4:38 pm Post subject: |
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| 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
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| Posted: Sat Mar 08, 2008 5:15 pm Post subject: |
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| 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
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| Posted: Sat Mar 08, 2008 6:59 pm Post subject: |
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| 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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