[TechAssist] Re: Hitachi Model 27CX29B511 Chassis No. HP334
- From: "George" <grndmstrg@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 18 Dec 2003 19:23:14 -0800
Walter,
The B+ label should be over the line just below, they misplaced it on the B-
line which is grounded on the print near the audio IC. So you are correct in
your observation and no your not cross eyed. By the way the print that I
have is quite clear.
George
Afana Electronics
Moreno Valley, CA
----- Original Message -----
From: "walter wood" <wwood_38478@xxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, December 18, 2003 2:33 PM
Subject: [TechAssist] Hitachi Model 27CX29B511 Chassis No. HP334
> Set was shutting down at turn on.
> After a few tries I could see that the vertical
> wasn't working.
> I replaced the Vertical output IC and now the set
> stays on, and has High voltage and filiments.
> No sound, No OSD, and turning up the screen reveals
> No vertical.
> I downloaded the schematic from the Hitachi
> Website, but it is poor quality.
> In trying to find a common fault for the sound and
> vertical, I have found a descripency that I hope
> someone can explain.
> The voltage chart shows Pin 13, and Pin 8 of the
> vertical IC and Pin 10 of the audio IC to have
> about 26vdc on them.
> They are low (about 23vdc) but present.
> In trying to see if this was a common source I find
> that the vertical source is from Flyback Pin 8
> through D561 and R552.
> However the audio vcc seems to come from pin 4 of
> T801 But it looks like to me that this would be
> negative voltage due to the diode and elyc cap in
> that circuit.
> Sorry, I can't read the location number on the cap
> and diode.
> Can anyone shed any light on this, or an I looking
> at a mis-drawn print?
> Or maybe, I'm cross eyed.
> TIA
> Walter
>
> =====
> Walter Wood
> Future Tech Home Center
> 2786 Hwy. 43 N.
> Lawrenceburg Tn. 38464
> 931-829-3337
> Fax 931-829-4044
> mailto:wwood_38478@xxxxxxxxx
>
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