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Zenith B32A34Z / Completely Dead    
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allenk



Joined: 18 Jul 2009
Posts: 4
Location: Edinburg,Pa

PostPosted: Sat Jul 18, 2009 2:08 pm    Post subject: Zenith B32A34Z / Completely Dead Reply with quote

Zenith 32" T.V.
Model B32A34Z
Serial 922-64240038

My nieghbors were watching this tv and all of sudden it just shut off and wont turn back on,even after waiting for a half hour.Also unplugged the tv and plugged it back in,still nothing. I havn't taken it apart yet,was hoping you could give me a place to start and what to look for and if something could be done to fix it.

Thanks for any assistance you can give me,
Al
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Sat Jul 18, 2009 3:13 pm    Post subject: Reply with quote

Look for anything that doesn't look right.

Check fuses (FX3401 & FX3402) first. Then check voltages across CX3407 (Raw B+), CX3420 and CX3424 (Stand-by B-pluses).
If has Raw but no stand-bys replace CX3416 (100ufd 25V).
allenk



Joined: 18 Jul 2009
Posts: 4
Location: Edinburg,Pa

PostPosted: Sat Jul 18, 2009 5:38 pm    Post subject: Zenith B32A34Z / Completely Dead Reply with quote

Thanks for the info I will try that out and let you know what happens.
Al
allenk



Joined: 18 Jul 2009
Posts: 4
Location: Edinburg,Pa

PostPosted: Mon Jul 20, 2009 5:20 pm    Post subject: Zenith B32A34Z / Completely Dead Reply with quote

Ok,heres what I found. I opened the tv and found 2 Ceramic disc's that were burnt,the numbers are cx3210 and cx3211. I also found a schematic online and downloaded it which helped out. On the service pages it says that this tv is module replacement only,what does that mean?

I also found both parts and part numbers with the RC code I, whitch reference's a 27 inch tv,can I still by the parts and replace them or not?

Is there anything I have to do before I replace the parts if I can,is there any stored power and how do I release it?

thanks, Al
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Mon Jul 20, 2009 6:20 pm    Post subject: Reply with quote

Location: Zenith part #: Generic value: Digi-Key: EXAMPLE

CX3210 22-8386-01 270pfd 2KV 10% http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P9558-ND

CX3211 22-8386-08 1000pfd 2KV 10% http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P9565-ND

Don't worry about 27"/32" or Module/Board level.

Check horizontal output transistor (QX3203) for short.
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allenk



Joined: 18 Jul 2009
Posts: 4
Location: Edinburg,Pa

PostPosted: Tue Jul 21, 2009 7:59 am    Post subject: Zenith B32A34Z / Completely Dead Reply with quote

Ok I found that transistor,how do you check for the short? There are 3 places b,c,e.
JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away

PostPosted: Tue Jul 21, 2009 7:14 pm    Post subject: Reply with quote

Testing a transistor.
Testing with a multimeter.
Use a multimeter to check each pair of leads for conduction. Set a digital multimeter to diode test and an analog multimeter to a low resistance range.

Test each junction with meter leads connected both ways (six tests in total):
The base-emitter (BE) junction should behave like a diode and conduct one way only.
The base-collector (BC) junction should behave like a diode and conduct one way only.
The collector-emitter (CE) should not conduct either way.

The above procedure is for a Standard transistor. The transistor you're testing is special. Plus you'll be testing it "In-Circuit."
The base-emitter junction has a internal resistor across it, plus "in-circuit" the secondary of the driver transformer is across it too. So a low reading with meter leads connected in either polarity is normal.
The collector-emitter junction has an internal damper diode, so will normally test like a diode.
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