Joined: 11 Sep 2007
|Posted: Tue Sep 11, 2007 7:16 am Post subject: SHARP 81GF-63E - R613,R623 and R624 very hot with E/W prob..
|Hi to all...
in first, excuse my poor english
My SHARP TV has been out ....the D735 was replaced with IC705 (MOC8106) and C720 because only standby possible....
i've changed too Q601 by a BU2525AF (i don't have BUH515) , R623, C611 ,C613....
the TV start again now, but R613,R623 and R624 become very hot after 10 minute of running
i've checked all components around and seem to be ok except overheating of those 3 résistors (R613,R623 and R624)
the picture seem to be good except the low corners are incurved..E/W problem certainly..
i've checked the D1061 on dynamic focus unit, and there was a 21v Zener diode ...on my datasheet of 81GF63E, it would be a 47v zener diode !
but with a 47v, the picture be an ellipse on the center of the screen...so i've replaced the 21v zener....
Some other value are not the same on the TV and on the datasheet TV ;(
R610 on TV is 33ohms and on shéma is 1ohm !
the D1601 zener diode as i said before....
on H connector the 175v pin is only at 165v here...is there a problem too ?
after D735, the 150v is only at 145v...this diode is like a zener on 145v isnt'it ? so it's normal i suppose...
Now i don't know where to search
please help me before i send this TV to the trash
Thanks to all