[TechAssist] Re: Hitachi 31KX6b Chassis G9LXU1M
- From: "Shaun" <ssroark@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 23 May 2002 17:52:50 -0600
I replaced C612 and C733 and that seems to have fixed the problem. Both caps
were very low and measured bad esr. Thank you for all your help.........:-)
Shaun
Advanced Electronics
Fort Morgan, CO 80701
(970)867-3124
ssroark@xxxxxxxx
----- Original Message -----
From: "Phil Bader" <philbad@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, May 23, 2002 5:49 AM
Subject: [TechAssist] Re: Hitachi 31KX6b Chassis G9LXU1M
>
> The first thing I would consider in light of the fact it has the problem
> "cold" would be an electrolytic cap bad. In the morning when cold, take
> your heat gun and heat one half of the board being careful to not heat
> the other side(use a cardboard devider,etc)Now power on for the first
> time. If it stays on, turn off and use a can of coolant to cool a
> section of that area.Try to reproduce the symptom. Get it? Maybe a cap
> in the Xray protect ckt, or power supply.-Phil Bader
>
> Shaun wrote:
> >
> > This set will go into shut down when first turned on for the day but
after it warms up it will come on and work fine all day. I have looked at
the power supply and when it is in shut down the wave form off of pin 7 of
IC 901 is off. I am using a sams 2985 and Q903 E 144 vdc B 144 vdc and C 0
vdc. The schmedic says on Q903 E 43 vdc B 42.9 and C 0 vdc. I have a similar
strange dc volts on Q904, only the E is correct at 130 vdc.
> >
> > Shaun
> > Advanced Electronics
> > Fort Morgan, Co 80701
> > 970-867-3124
> >
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> --
> Philip Bader, Jan Phyl TV Inc.
> 3420 Recker Hwy,Winter Haven, Fl. 33880
> voice/fax: 863-299-8821
> Established 1976
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