[TechAssist] Re: Mitsubishi VS-4551 severe side barrell bowing, converg. out sides (VZ2 chassis)
- From: Willie Hunter <williehunter2@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 14 Feb 2005 15:49:12 -0800 (PST)
Phil, here is a couple tips I dont know if they help.
1.Bowing on top and bottom of picture.
Check for 5.4V on pin 8 of IC4B01,if low or missing check Q4B01.
2.Check for 6V on the base of Q4B01 if low or missing check the
value of R4B05 (220k).
Willie.
Hunter TV
Detroit,Mich.
Phil Bader <tjanphyl@xxxxxxxxxxxxxxx> wrote:
Update.
The two positive supplies and the two neg. supplies to the converg chips
are there at the STk's pins
Phil Bader wrote:
>I actually located a VZ2 chassis manual, so I guess the next step is to
>compare the positive and neg sources to the STL391-020 chips and see if
>any are missing. Will update. Looks like there is neg 27V, neg 36V,
>pos35v, pos 28V.
>Phil Bader
>
>Phil Bader wrote:
>
>
>
>>Good center convergence that adjusts in "test" mode
>>Sides are very bowed like a barrell (opposite of pincushion). with the
>>convergence way out.
>>Red way out worse on right, Blue out farthest on left. But both sides
>>are /really/ bad.
>>I read some related Mits tips on this model.Checked transistors
>>Q8F04,Q8F06,Q8F02,Q8F03 out of ckt for leakage.All OK. Checked diodes
>>D8F00,D8F01 for same out of circuit, all OK. Checked diode D501 same. OK.
>>As suggested by Mits.
>>As a test, I replaced both convergence ICs, both STK391-020.
>>Same.
>>I noticed after on some minutes I got a vertical arc-like distortion and
>>pull-in from top/bottom. I resoldered all that.earlier, so not bad
>>connection. Is this a possibility of bad yokes?
>>I need some advice here. I can't locate the svc manual either.
>>Phil Bader
>>
>>
>>
>>
>>
>
>
>
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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