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Sony KV27TS29 Sides Bow In

G

gymsurely

It looks like the problem is IC501 (TDA8172). Does this make sense? The
picture returns to normal if I tap the part. I'm not an electronics
person but I'm tempted to buy a part and replace it.
 
R

Ross Herbert

It looks like the problem is IC501 (TDA8172). Does this make sense? The
picture returns to normal if I tap the part. I'm not an electronics
person but I'm tempted to buy a part and replace it.

first, check for dry joints in the area around the IC. It might be
that simple....
 
gymsurely said:
It looks like the problem is IC501 (TDA8172). Does this make sense? The
picture returns to normal if I tap the part. I'm not an electronics
person but I'm tempted to buy a part and replace it.

It must be some part nearby, maybe even mounted on the same aluminum
plate, but definitely not this IC. Your error is in the E/W circuit,
this IC handles vertical deflection. Most of the time the E/W regulator
transistor or some related coils will have bad solder connections.
 
G

gymsurely

I reflowed and/or added some solder on about 12 pins around the IC. All
looks well again.

Thanks
 
B

b

gymsurely said:
It looks like the problem is IC501 (TDA8172). Does this make sense? The
picture returns to normal if I tap the part. I'm not an electronics
person but I'm tempted to buy a part and replace it.

i recall repairing a kv27ex about 3 years ago with this condition.
there was a geometry daughterboard at the rear of the main pcb which
had dry joints where it joined the main pcb. I also cleaned all the
pots on it to be sure.

hope this helps, Ben
 
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