[TechAssist] Re: Hitachi 60UX58B AP83 chassis, distorted RED raster
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: "Techassist" <techassist@xxxxxxxxxxxxx>
- Date: Thu, 23 Oct 2003 10:15:37 -0400
Here was Alvie Rodgers from Hitachi's response (in case it may help anyone
else in the future):
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@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "Alvie Rodgers C.E.T." <rodgers@xxxxxxxxx>
To: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>; <geo@xxxxxxxxxxxxx>
Sent: Thursday, October 23, 2003 9:47 AM
Subject: Re: Hitachi 60UX58B AP83 chassis, distorted RED raster
> Jorge:
> This sounds like the Convergence output STK, and/or
> the low ohm resistors on the Red H/V STK returns.
>
> FOR THE RED PROBLEM:
>
> Swap the Red and Blue convergence Yoke Plugs.
> While observing the Blue, does it deflect correctly?
> Yes: Problem is in the Red conv. Yoke.
> No: Problem is either Output Stage or Convergence waveform generation
(DCU).
> Return the Convergence Yoke plugs to normal position.
>
> Swap the Red and Blue deflection Yoke Plugs.
> While observing the Blue, does it deflect correctly?
> Yes: Problem is in the Red deflection Yoke
> No: Also, Check C726, R732, L709.
> The H. Deflection is common, so it doesn't appear to be any
> problems there.
> Be sure to check ohmage from the output side of Deflection drive
> C711, C710 to the Blue, then Green, then Red H. Yokes.
>
> Before beginning next step.
> It sounds like your problem is Horizontal.
> Example: If you problem is that red is not wide enough left to right, it's
> Horizontal, (RH).
>
>
> SWAPPING OUTPUTS FROM THE DCU ON THE DC CONNECTOR.
> Swap BH (using RK04) with RH (using RK05)
> Unsolder the end closest to the DC connector.
> Use a jumper wire from the lifted leg of RK04 to the unsoldered connection
for
> RK05.
> Use a jumper wire from the lifted leg of RK05 to the unsoldered connection
for
> RK04.
>
> Again while observing Red, is it wide enough and did the problem move
> to Blue? Remember your using the RH to drive BH and vice versa.
> No: Problem is in the output stage.
> or
> Does the problem move to the Blue?
>
> If the answer is moved to Blue, the problem is located in the waveform
generation
> circuit within the DCU. Change the DCU.
>
> You can isolate individual sections of the Convergence Output stage
> the same way.
>
> You can swap the same outputs on the Convergence Outputs BH with RH
> to narrow the search further.
> Same with Inputs to the STKs, BH with RH.
>
> Be sure to resolder all Convergence IC connections. "All of them".
>
>
> ***************************************************
> Don't forget to check the Hitachi Web Site
> for any additional information:
> http://www.hitachiserviceusa.com
>
> If this information helps in any way and/or you repair the unit,
> please POST your findings so that all can benefit from your
> experience.
> "Let's work together".
>
> Alvie Rodgers C.E.T.
> Technical Writer/Trainer
> Hitachi Home Electronics
>
> ***************************************************
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> To: "Alvie Rodgers C. E. T." <rodgers@xxxxxxxxx>; <geo@xxxxxxxxxxxxx>
> Sent: Thursday, October 23, 2003 8:24 AM
> Subject: Hitachi 60UX58B AP83 chassis, distorted RED raster
>
>
> Jorge,
> I am forwarding this to Alvie Rodgers from Hitachi for his input.
>
> 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@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
> www.geminicomputertvsecurityalarms.com
>
>
> ----- Original Message -----
> From: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, October 23, 2003 4:54 AM
> Subject: [TechAssist] Hitachi 60UX58B AP83 chassis, distorted RED raster
>
>
> >
> > Another dog, this one is driving me mad..
> > Do you realize when a set MAKES NO SENSE??
> > This is the one, Hitachi PTV 60UX58B, AP83 chassis.
> > The set was dead and I fixed it by changing the HOT,
> > no further problems until I tried to adjust the convergence
> > THE RED COLOUR just wouldn't fill the right side of the screen,
> > it was impossible by trying the magic focus, then entering the
> > service mode and adjusting colour by colour... then I disconnected
> > the convergence yokes and green and blue showed a clean
> > pincushioned pattern, but the red croshatch barely filled 75% of
> > the picture and was unbelievably distorted when trying to fill
> > the right edge, looking somewhat like bent and losing focus there.
> > To make a long story not so long, I interchanged everything:
> > yokes, crt boards, even HV leads, and ALWAYS THE SAME
> > PROBLEM WITH THE RED.. the tube front chamber is full of
> > coolant, no leaks, no nothing ..the beam just won't deflect properly!!!
> > I am about to believe the only solution left is changing the red tube,
> > but I do not think the customer is willing to pay to replace it (not
> cheap!!)
> > Any smart soul with a wise suggestion??
> >
> > Thanks a lot in advance
> >
> > Jorge
> >
> >
> >
> > Jorge Camboni, GY Electronics, Richardson, TX
> >
> >
>
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