Search found 5 matches

by mmalf_mi
Sun Nov 09, 2008 7:13 am
Forum: General Discussion
Topic: Scoping the primary of a switching power supply. fuses blow
Replies: 6
Views: 1329

thanks all !

Nice to have people. Hope I can pay it back someday.

Mike
by mmalf_mi
Sat Nov 08, 2008 8:15 am
Forum: General Discussion
Topic: Scoping the primary of a switching power supply. fuses blow
Replies: 6
Views: 1329

Scoping the primary of a switching power supply. fuses blow

Do I need to power the TV through an isolation transformer? Fuses blow when I hook the scope ground to the chassi ground side of the switching power supply. Been getting back into service work again and I forgot the right way to scope the primary of the switching power supply. I think years ago, the...
by mmalf_mi
Tue Nov 04, 2008 4:13 pm
Forum: General Discussion
Topic: Zenith TV Schematics z32x31d
Replies: 1
Views: 785

Zenith TV Schematics z32x31d

Trying to find Schematics for a Zenith z32x31d TV. Preferrably on line.
by mmalf_mi
Sun Nov 02, 2008 4:47 pm
Forum: General Discussion
Topic: JVC dead set
Replies: 12
Views: 2938

What killed the zener??

Bigglez, A reasonable and viable question... The connector (cnooc) is not connected to anything and is internal to the cabinet of the TV. The set has never been serviced and is about 4 yrs old. The bad diode was on the SCL1 line of the connector. If not a spike on the connector, then a huge spike on...
by mmalf_mi
Sun Nov 02, 2008 6:02 am
Forum: General Discussion
Topic: JVC dead set
Replies: 12
Views: 2938

JCV AV-27WF35 dead set

Wanted to pay it back to others who post helpful info on line. I am an EET, not a tv service tech (so I needed help with how this TV worked). I had a dead set, turned out to be D708 (5.6v zeener diode) was pulling down pin 53 of IC201 (uP) to a 2.5v level with + & - spikes. 3 out of 50 times the set...