Sony tv color reversal
 

Thanks for the great information! From a Google search I found the
information in this thread I needed to repair my Sony KV-20TS30 TV
which suddenly developed color gradients in an oval pattern. My
problem was just as described he the THP601 thermistor (black
1/2x5/8 inch component next to where the degaussing coil plugs into the
main circuit board) had no solder left on the center pin. I could also
wiggle the lead. Turning the set upside down and applying solder got
the set working again.

Terry wrote:
Sony tv color reversal: SUCCESS!!!!
This MADE my week! I'm a hero in the extended family! Wednesday
night I finally brought home my soldering equipment (not too much
call
for soldering DB25s in these days of the 100MBit office anyway!),
pulled the back cover, turned the whole set upside down and confirmed
all the hints from you guys:
The degauss wires were indeed covered with black tape. The circuit
traces went from those wires directly to one of the black boxes which
did indeed have 3 pins (I had to shine my bright light *through* the
circuit board to see this clearly - might be a good hint for
beginners
in the future)...and LowAndBehold, one of the pins was NOT SOLDERED
ANYMORE (guess how excited I was) It was not burned looking in the
least, just no longer soldered and in fact I could gently wiggle it
and feel that it was not solidly connected. I then KNEW you were
right.

I fired up my iron, used the hot iron itself to clean up the pin and
hole and gave it a nice quick small flow of fresh solder. I kept
wanting this to be more difficult... but I just closed the tv back
up,
plugged it in, turned it on and there to the shocked amazement of my
family was a PERFECT COLOR PICTURE! Total Cost: a few good
descriptions to this group and a speck of solder. You guys are
Great!
I'm going to re-visit the crippled stereo equip in my lower room now!

Final Hindsight data: The component was marked "THP601" on the
circuit board (I decided this must mean "Positive" acting
"THermistor"
or "Posister" as Sam mentioned and an electronics friend said meant
just the opposite direction for the voltage or the temperature.)

Terry

Very common with Sony and Panasonic sets. Also a common problem:
intermittant fuse failure due to the current being initially used by the dgs
circuitry. Seen a lot of Thomson and Panasonic sets with this senerio.
"Donald Gudehus" wrote in message
ps.com...
Thanks for the great information! From a Google search I found the
information in this thread I needed to repair my Sony KV-20TS30 TV
which suddenly developed color gradients in an oval pattern. My
problem was just as described he the THP601 thermistor (black
1/2x5/8 inch component next to where the degaussing coil plugs into the
main circuit board) had no solder left on the center pin. I could also
wiggle the lead. Turning the set upside down and applying solder got
the set working again.

Terry wrote:
Sony tv color reversal: SUCCESS!!!!
This MADE my week! I'm a hero in the extended family! Wednesday
night I finally brought home my soldering equipment (not too much
call
for soldering DB25s in these days of the 100MBit office anyway!),
pulled the back cover, turned the whole set upside down and confirmed
all the hints from you guys:
The degauss wires were indeed covered with black tape. The circuit
traces went from those wires directly to one of the black boxes which
did indeed have 3 pins (I had to shine my bright light *through* the
circuit board to see this clearly - might be a good hint for
beginners
in the future)...and LowAndBehold, one of the pins was NOT SOLDERED
ANYMORE (guess how excited I was) It was not burned looking in the
least, just no longer soldered and in fact I could gently wiggle it
and feel that it was not solidly connected. I then KNEW you were
right.

I fired up my iron, used the hot iron itself to clean up the pin and
hole and gave it a nice quick small flow of fresh solder. I kept
wanting this to be more difficult... but I just closed the tv back
up,
plugged it in, turned it on and there to the shocked amazement of my
family was a PERFECT COLOR PICTURE! Total Cost: a few good
descriptions to this group and a speck of solder. You guys are
Great!
I'm going to re-visit the crippled stereo equip in my lower room now!

Final Hindsight data: The component was marked "THP601" on the
circuit board (I decided this must mean "Positive" acting
"THermistor"
or "Posister" as Sam mentioned and an electronics friend said meant
just the opposite direction for the voltage or the temperature.)

Terry