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Convergence problem

Hitachi 50EX10B. I have the convergence looking almost perfect, except
I can't straighten out the bow (down) on the bottom of the screen
viewing cross hatch pattern. I had no control of blue, so I replaced
all the convergence amp IC's (figured good idea since the set is 11
years old). This fixed the blue problem. I can get about the center 2/3
of the bottom line to straighten, but both corners turn down, and no
conv. adjustment on the board removes this. I don't see where I can
adjust anything else to fix this. Is there another component at fault?
Thanks to all.
 
kip said:
Bias resistors off the STK,s return .
kip

Thanks for the info Kip. I'll look over the schematic to try to find
these and test(I'm fairly new in repair). I'll post with results. Do
these usually short, or drift way off value?
 
E

Eric

Jan 1, 1970
0
it would be very odd if a resistor should go short semiconductors go short
not resistors,

Resistors go high or open circuit.


Bias resistors off the STK,s return .
kip

Thanks for the info Kip. I'll look over the schematic to try to find
these and test(I'm fairly new in repair). I'll post with results. Do
these usually short, or drift way off value?
 
K

kip

Jan 1, 1970
0
Look around the STK,s for low value about 1.2 to 2.0 ohm close tolerance
resistors.

kip
 
K

kip

Jan 1, 1970
0
Hey Resistors go high and low in value in those circuits

kip...
 
kip said:
Look around the STK,s for low value about 1.2 to 2.0 ohm close tolerance
resistors.

kip
I checked all the resistors and all OK. I initialized the system to
reset to factory, and started from scratch. I managed to get the
covergence acceptable, (but with a slight bow on bottom still). Set
looks good. Thanks again.
 
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