View Single Post
  #8  
Old 12-05-2015, 06:37 PM
zeno's Avatar
zeno zeno is offline
VideoKarma Member
 
Join Date: Mar 2013
Location: New Hampshire
Posts: 4,672
I have worked on quite a few PVM series sets. I
never had one with shut-down. On consumer level
KV**** sets the H-Stat was usually the problem.
Removing the plug & putting a jumper on was a test.
At that point they often arced.....
The wire feeds a latch circuit with 2 or 3 transistors
that kills Hoz drive. IIRC its only for SD. It detects
DC & if over a certain level activates SD.
Also regulator IC or transistor was common BUT the PVM
probably uses a switching power supply ( SMPS ) instead
of the simple pass circuit. Been to long so cant remember.

For now try running the set on apx 100 VAC & see if it
still shuts down. Its at the point where you gotta nail down
if its :
Failed SD circuit
Failed PS
Failed horz osc/drive/out etc.

If you have a manual post the PS & the SD parts, that will
help.

73 Zeno
Reply With Quote