[TechAssist] RCA F19431, ch# TX809D storm. no power up, has stby volts
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
- Date: Thu, 12 Aug 2004 11:58:56 -0400
Customer claims this went dead after storm. Fuse OK, no signs. The smps
does seem to sound too raspy for my taste, but seems to be working,
here's some voltages:
diodes around the secondary of the smps txfmr: (measurements indicate
output, usually @cathode):
DP61 +10.8v
DP93 +6.74
DP63 +12.25V
DP97 -15.71V
DP65 +11.53V
HOT coll: +112VDC
IP330 (L7809) input: +10.87V, out: +8.89V
IP301(7806A) in: +10.08V, out: +5.93V
Transistor: TP315 (TO-220) coll: +6.85V B&E: zero V
I/R det eye: one leg: +5.1V
I need some other points to see if there is a Vcc at micro, eeprom,etc.
I did change the 4 pin opto-iso in the PS as a test, no help.
It appears to be in standby, but probably a shorted IC somewhere
dragging a source down.
BTW I removed the tuner incase it was the cause. No help.
Phil Bader
PDF anyone?
Thanks, Phil
--
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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