Question about Hitachi 55FX48B 55" Rear Projection Television
I need help troubleshooting a Hitachi rear projection television model 55FX48B. At first all diagnosis LEDs would come on and after a few second would turn off. I followed the trouble shooting guide in the service manual and I found and replaced two defective components; Diode D907 (Zener 500mw 36V) had gone open and I901 (STR-M6811A) its voltage output was way out of the numbers called for in the schematic. After replacing these two the diagnosis LEDs now display a different problem as follows. D964 (A12v), D966 (27v), D922 (H23v), D947 (Audio), and D912 (Protect Red), light as soon as power is applied to the TV. After a few seconds D946 (TV9v) and D939 (TV5v) come on and all LEDs turn off at the same time with the exception of D947 (Audio). D947 (Audio)never goes off and D940 (+B120v) or the power indicator in front of the TV never light on. As long as there?s power to the TV this condition keeps cycling at about once every 30 seconds. Using the service manual"s trouble shooting method I?ve come to a dead end. All voltages seem to come up to the right number and then drop. Has anyone seen this before, or has an idea of what I should check. Thanks in advance Manny
If the 120v never comes up, check e994 as it is probably open, and either the blue horizontal retrace cap infront of the h-out transistor is burnt/shorted or transistor could be.
Posted on Aug 05, 2007
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