TV Forums

Free Games TV Forums

  Main Index FORUM
HOME 		Search Posts SEARCH
POSTS 		Who's Online WHO'S
ONLINE 		Log in LOG
IN 		Rules & FAQ RULES
F.A.Q.

Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
zenith B19A21D

 
 


maverickr
User

Oct 12, 2007, 5:23 PM

Post #1 of 8 (1682 views)
Shortcut
zenith B19A21D Can't Post
chassis# CN-220A. The color on this set is all blue. I'm looking in the line of a bad IC as the fault. Am I headed in the right direction? Thanks



Paulpablo
Enthusiast

Oct 12, 2007, 8:21 PM

Post #2 of 8 (1676 views)
Shortcut
Re: [maverickr] zenith B19A21D [In reply to] Can't Post
Replace all 120K resistors on CRT neck board.


mel
Veteran

Oct 12, 2007, 11:08 PM

Post #3 of 8 (1669 views)
Shortcut
Re: [maverickr] zenith B19A21D [In reply to] Can't Post
Probably a cathode to heater (ground) short of the blue gun in the CRT. Otherwise, I would suspect the IC901.


maverickr
User

Oct 18, 2007, 9:44 PM

Post #4 of 8 (1651 views)
Shortcut
Re: [Paulpablo] zenith B19A21D [In reply to] Can't Post
In Reply To
Replace all 120K resistors on CRT neck board.
Should i replace even if they measure ok?


maverickr
User

Oct 18, 2007, 9:51 PM

Post #5 of 8 (1650 views)
Shortcut
Re: [mel] zenith B19A21D [In reply to] Can't Post
In Reply To
Probably a cathode to heater (ground) short of the blue gun in the CRT. Otherwise, I would suspect the IC901.
I suspected it was IC901 (I101) on my board as well. But if it's not that, is there anything i can do about the short of the blue gun in the crt?


mel
Veteran

Oct 19, 2007, 9:32 PM

Post #6 of 8 (1637 views)
Shortcut
Re: [maverickr] zenith B19A21D [In reply to] Can't Post
First, verify the short by checking for continuity between pins 3 and 5 on the CRT with the board pulled. You can "cludge" it by wrapping two turns of wire around the core of the flyback and attach the ends to the heater terminals on the CRT board. Isolate the ground side (pin 6) by opening the printed circuit with a sharp blade.


maverickr
User

Oct 31, 2007, 8:15 PM

Post #7 of 8 (1614 views)
Shortcut
Re: [mel] zenith B19A21D [In reply to] Can't Post
In Reply To
First, verify the short by checking for continuity between pins 3 and 5 on the CRT with the board pulled. You can "cludge" it by wrapping two turns of wire around the core of the flyback and attach the ends to the heater terminals on the CRT board. Isolate the ground side (pin 6) by opening the printed circuit with a sharp blade.
There was no short so i've ordered that IC to replace.


maverickr
User

Dec 10, 2007, 6:37 AM

Post #8 of 8 (1582 views)
Shortcut
Re: [maverickr] zenith B19A21D [In reply to] Can't Post
Any idea where i can find zenith part nimber 905-10359? Seems like everywhere i find it, is NLA.

 
 
 


Search for (options) - Page loaded in: 0.12 s on (CGI/1.1)
0