| T O P I C R E V I E W |
| cirvin |
Posted - Aug 05 2005 : 12:30:20 PM
I have a Sharp 25A-M100 television, and it has a problem with the vertical diflection circuit. When you turn the tv on, it starts up fine, but the vertical diflection flickers in and out. I Checked the wires to the coils on the tube, but they are fine. The odd thing is that if I am looking in the back of teh tv, and I lift up the left corner of the PCB, the picture comes back and the vertical deflection becomes stable. Has anyone ever experienced something like this, or have any advise on how to fix it?
EDIT:
I was talking with the repair man at the local record shop and he tells me that around the time the tv was made (1992) , the construction methods of the PCBs left many of the chips with bad solder joints, so it may be a matter of adding some more solder to the pins of the vertical deflection IC.
Edited by - cirvin on Aug 05 2005 9:20:11 PM |
| 1 L A T E S T R E P L I E S (Newest First) |
| sergiosparks |
Posted - Aug 06 2005 : 09:25:18 AM
you probably have a cold solder problem ontha vertical output circuit..usually i remove
the old solder clean the circuit board with lacquer thinner and apply new solder,use a magnifying lense and see the good and the uggly solder joints.if things persist make a list of all the capacitors involve in the vertical output system and replace them..saves you time..all capacitors resistors and ic's involved
in that circuit will carry numbers that starts
with the same number ie C601 C602 , IC 601 and so on..tell me name of the vertical output
ic i'll see what else i can tell you.
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