[TechAssist] : Hitachi HDTV--different problem-PTV---more

  • From: Hugh at Main TV <maintv@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Thu, 18 Dec 2003 22:13:30 -0700

Thanks to all that responded,  I must not have been clear -- the 
convergence was bad-now is ok with new chips, second problem is now good 
pix and convergence-but has three large curved lines
in the top 1/3 of pix.-- these three curved lines are on top of the 
regular picture--one line is red, one blue, and one green!   problem is 
in the video,  video out from output jack on set is normal-no lines. 
Problem shows up with antenna input video and external video inputs.
Pix is Ok with input into component jacks with HD signal.   I think 
problem is caused in the PIP module as video looks ok going to PIP 
module, but not ok on screen of TV.  HD reception does not go through 
the PIP unit so is good.  I plan to do the old bypass trick tomorrow of 
the PIP mod. as we do in the older Mitsubishi  PTVs. Not sure what to 
bypass so will just try caps from input to output pins on PIP with PIP 
unit removed from set.
 Customer says he never uses the PIP and does not want to pay to get the 
PIP fixed.
Will post results if/when I figure this out.
Hugh
George wrote:

>Did you check the caps in the vertical circuit?
>
>George
>Afana Electronics
>Moreno Valley, CA
>
>----- Original Message ----- 
>From: "Hugh at Main TV" <maintv@xxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Thursday, December 18, 2003 2:50 PM
>Subject: [TechAssist] Hitachi HDTV--different problem-PTV
>
>
>  
>
>>Have Hitachi HDTV  43FDX01B,  came in with bad convergence-replaced both
>>conv. chips (STK392-110 put in Hitachi chips)
>>2.2 ohm resistor open on one return line in conv. yoke circuit.
>>Convergence now looks ok, but now have three seperate red, blue, and green
>>curved lines over the pix at the top of raster. Problem shows up in aux.
>>video input also.  Put in new digital convergence module--still same
>>problem.  Nothing found on Hitachi service web site.  Set made in 2000.
>>Nothing on Winstips.   Theses 3 colored curved lines are about 8-10 in.
>>across.
>>Has anyone seen this problem in Hitachi?  Cutomer wants TV back for
>>Christmas.
>>
>>-- 
>>Hugh Thornley
>>Main TV
>>636 Main St.
>>Longmont, Colorado 80501
>>303-776-6955
>>maintv@xxxxxxxxxxx
>>
>>
>>
>>
>>    
>>
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-- 
Hugh Thornley
Main TV
636 Main St.
Longmont, Colorado 80501
303-776-6955
303-776-0792  FAX



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