[TechAssist] Re: Zenith A25B33W
- From: <southadamstv@xxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 2 Nov 2002 15:24:08 -0600
Hi, I just had an A27a11D leave my shop ( used an A27B33W schematic as a
reference to repair) off of pin 2 of the regulator is a 180K ohm resistor check
for open. You may also check Cx3413(22uF63V)& Dx3409. Hope you get lucky.
Larry K.>
> From: Rich Bateman <rbateman@xxxxxxxxxxxxxxxxxx>
> Date: 2002/10/31 Thu AM 11:57:18 CST
> To: "Help (E-mail)" <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Zenith A25B33W
>
>
> Hello Folks:
> this Zenith set came in dead. The main fuse was blown. I replaced
> IC3431 ( STR 53041) and it no longer blows the main fuse. The set still
> will not turn on. I found that the 9V source was 0V . The 9V comes from ICX
> 3441 ( LM7809) who receives his 13.2V input from Q3404 when it is switched
> on. I have 15V on the emitter of Q3404 but it is not switching on. Q3402
> is supposed to turn on Q3404 when the Microprocessor chip pin 32 supplies 5
> volts to it's base. I don't see any voltage change on the base of Q3402. I
> hate to think that the microprocessor chip is bad. Any suggestions ???
>
> Richard J. Bateman, CET, CA.
> Electronics Program Area Coordinator
> Amherst Campus
> 716-691-0012 EXT - 232
> E-MAIL rjbateman@xxxxxxxxxxxxxxxxxx
>
>
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Larry J. Kibodeaux
South Adams TV & VCR Repair
216 1/2 South Adams Avenue
Rayne, LA 70578
southadamstv@xxxxxxxxxxxxxxxx
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