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

 
 


maverickr
User

Oct 12, 2007, 5:23 PM

Post #1 of 8 (1702 views)
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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 (1696 views)
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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 (1689 views)
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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 (1671 views)
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Re: [Paulpablo] zenith B19A21D [In reply to] Can't Post
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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 (1670 views)
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Re: [mel] zenith B19A21D [In reply to] Can't Post
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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 (1657 views)
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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 (1634 views)
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Re: [mel] zenith B19A21D [In reply to] Can't Post
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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 (1602 views)
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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.

 
 
 


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