[TechAssist] Re: KV32V68 Big Problem
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 8 Nov 2004 23:29:04 -0500
Then you can rule out both, Judge.
Have you checked the HV caps and the flyback pulse for good 12 uS shape?
This is what you wrote:::
The waveform on the base of the...<<what??>>.... looks good,but the
>>> applitude only 35 volts pp with signal instead of 50.3 pp.
Now is it your driver transistor, the one that powers the Final Horiz
output that keeps blowing, along with the SMPS transistors???? Or is it
regulators , rather than the SMPS outputs like you mentioned (ie 9V or 5V,
tho' that makes no sense whatsoever).
If the driver transistor is dying, then logicly that cap you replaced is
most likely (.47 for decoupling??? I'd think 1uf is better for that)
Try another one, but the next thing is the drive transformer may be shorted
causing the transistor to dissipate more power...how about the Horiz
output....has it been replaced?? Is it at least an original part??? Is that
what keeps shorting??
Damon Brunger
Telrad Electronics
Ft. Wayne, IN
----- Original Message -----
From: "Barry Thompson" <barrystv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, November 08, 2004 4:23 PM
Subject: [TechAssist] Re: KV32V68 Big Problem
>I remove the flyback and get 49 rings, the yoke is mine on my jig.
> barrystv@xxxxxxx
> Barrys TV
> Ottawa Canada
>
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, November 08, 2004 7:17 AM
> Subject: [TechAssist] Re: KV32V68 Big Problem
>
>
>> Have you ruled out the yoke and the flyback?
>>
>> Bob Waterman, CET® #RI-28
>> Master Technician License #9109
>> Service Manager / Parts Manager
>> Gemini Computer, TV, & Security Alarms
>> (508)695-7302
>> (508)695-7769 FAX
>> geminitv@xxxxxxxxxxx
>>
>>
>> ----- Original Message -----
>> From: "Barry Thompson" <barrystv@xxxxxxx>
>> To: <techassist@xxxxxxxxxxxxx>
>> Sent: Friday, November 05, 2004 6:29 PM
>> Subject: [TechAssist] KV32V68 Big Problem
>>
>>
>>> Hi: All: This set keeps blowing hots regulators,resolder drive xformer
>>> changed .47 cap. The waveform on the base of the looks good,but the
>>> applitude only 35 volts pp with signal instead of 50.3 pp.The waveform
>>> on
>>> the base and collector seem of the driver seem ok.The B+ is 135 volts
>>> and
>>> clean. No shorts on secondary.Is 15 volts a normal variation? Thanks
>>> Barry
>>> .
>>> barrystv@xxxxxxx
>>> Barrys TV
>>> Ottawa Canada
>>>
>>>
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