[TechAssist] Panasonic CT31F13U, ANEDP266 dead, HOT,D552,R764, other

  • From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 25 Oct 2003 13:06:54 -0400

Dead. HOT shorted. Removed HOT Q551 (D1556), powered up with about
+140VDC at collector trace.
Also found  shorted D552 (# RH3F loc.in fly area) and associated 10
ohm/2W resistor R764 open.
Replaced diode,HOT, resistor.
To eliminate possibility of shorted CRT, I unplugged CRT board, and
removed anode wire which I inserted in a  glass along with my HV probe.
Powered it on, with a burst of about 25KV anode voltage then shut off
again.Just a click now. D552 shorted again. I do not have an OEM diode
but used some heavy ,fast, 1 KV subs.D552 should be rated at about 1500V
@2.5A according to web. Twice it shorted.
D552 goes directly to yoke. I rand yoke H windings: good. My HOT is
still OK.
Need input here.
Phil Bader
-- 
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821      
email: tjanphyl@xxxxxxxxxxxxxxx
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