[TechAssist] Sony KV27TW75 Blowing Q601 and Q602

  • From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sun, 24 Apr 2005 04:27:43 +0000

Sony
KV27TW75
Chassis LN-1  (very simmilar to the AA-1 in the KV27TS27....)
MFD 1992


             Set came in with blown HOT, SW mode transistors and fuse. 
Connections on HDT were ok but wax had melted out of it.  Replaced then HDT 
with one from a AA-2 chassis (same #) Pulled flyback (1-439-498-12) it rang 
31 times one I had on the shelf (a leftover that didn't fix another set rang 
46 times) so I swaped it out with the one on the shel. used 2SD1880 (from 
B&D). Used 2SC4834 M instead of 2SC4664 B for Q601 and Q602. Set ran long 
enough to show a picture for a minitue then blew Q601 & Q602 and the fuse. 
Found a service bultien in the filing cabinet to change R647 to 1&#937;. But 
is still blowing Q601 &Q602 about a miniute after the picture appears (the 
2nd time used so left over pulls from a power supply C4106 to test)  Ideas.. 
Caps etc...

Peter Oliver
Tucson Radio TV


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