Question about JVC AV-56WP30 56" Rear Projection Television
Im having a common problem with this tv. In the top left corner the red convergence is off and sagging. I am not quite sure how to fix the problem. I took the cover off but I dont want to mess it up more than it already is. If someone can give me a step by step on how to fix the problem It would be appreciated, thanks Brian
Starts up with black raster, then shuts down with LED blinking 4 times
This is the micro telling you that the auto grey-scaling procedure has failed. Change resistors R909, R913 & R922 (180k, 1%) on crt base PCB. You will probably find that all these have gone high
Check R101 (4.7ohm), TR102 (C6180) and C126 (47uF, 16V)
Tv turns on automatically. Power supply works well, +5V present but seems that CPU (7700) does not (no standby mode), no remote or control on the front of the set
After replacing CPU (TMP47C434) and crystal 1770 (4.0MHz) both control worked intermittently. Replacing transistor 7674 (BC548) solved the problem
Will not work, standby (red) LED flashing
C604 in the 12V line is bad
Int going into standby
Replace C454 a 22nF smd, located near the Frame o/p ic.
Posted on Nov 24, 2007
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