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Sony 27" T.V.

D

Dani

Jan 1, 1970
0
Two units same situation. KV-27EXR25, KV-27EXR15, dead, IC 651 STRS6301
shorted, checked D623 Q604, & surrounding circuitry, & 2sd1886
horizontal output
shorted, repaired, solder horizontal section, checked drive cap, but
comes on with
high voltage just for a split second, & shuts down with about 125 volts
DC out of
the power supply at about 75 volts AC in with B+ at the flyback
unhooked. I can't
see anything gone in the power supply. Am I missing something here?
Thanks, Dani.
 
D

Dani

Jan 1, 1970
0
To ad to the previous post, got the KV-27EXR15 working, now it's not
quite wide enough on the right side & has bad linearity on that side
from
top to bottom. The horiz output gets quite hot also. I'm thinking
flyback,
but can't find the proper # to use. The # on IHVT is 1-439-423-21...no
listing by that number at Tritronics, & the site says it's 1-439-416-21

looking it up by model #, & it's NLA, 1-439-416-61 is supposed to be
the right one. I have a 1-439-416-41, but I'm unsure if I can use it.
Also
can't find a service manual, or data on these units, & I have lots of
Sony
manuals, & info. Dani.
 
S

Sofie

Jan 1, 1970
0
Dani:
I have found that the 2sc4927, which is the original HOT in many large CRT
Sonys.... will run COOLER than most other types and replacements.... if you
can't obtain that, then a 2sd1880 is a good, cool running, replacement.
You will also find that the width and linearity problems will usually go
away when these part numbers are used.
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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