[TechAssist] Re: Sony KV-32S20 [repeat failure]
- From: MDileo0000@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 18 Aug 2004 19:03:24 EDT
Danny,
Did you replace Q601and Q602 with 2SC4834P? P type only and matched as close
as possible. Scope the pair while running the set at reduced, 40-50VAC, AC
voltage and make sure the waveform output of those two transistors is uniform
and
even. There is much discussion in the Freelist archives about this. You don't
need original Sony for this as long as you use "P" type.
It seems that the original failure started with trouble in the horizontal
circuit as is typical of these chassis and usually brought on by poor solder
joints in the horiz. driver path.
Measure the resistance of the VDR's, should read open on the meg scale.
Dominic DiLeo
Atlantic TV
Freeport, Maine
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In a message dated 8/18/04 4:23:54 PM Eastern Daylight Time,
dgarris@xxxxxxxxxxx writes:
<< I repaired a dead Sony 32" KV-32S20 TV w/ Shorted Q601, Q602 (2SC4834) and
Open R607 .1ohm 1/2 W and Shorted HOT 2SC5148 (8-729-035-75).
Set played fine after repair for 2 days in shop. Customer picked-up set and
a couple days later called to say set was dead again! I found Q601, Q602
shorted and R607 Open this time. (The HOT was ok) Again Set played fine for
two days in-shop after second repair.
Customer called again a few days later and said set is dead again. What am I
missing?
Garris Radio & TV
Danny Garris
New Bern, NC
dgarris@xxxxxxxxxxx
Ph: (252) 638-4477
>>
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