[TechAssist] Re: update. Magnavox FP4620, PTV705-AH01 46" bright green,retrace,has sound,video.after storm

  • From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Mon, 06 Jun 2005 09:13:05 -0400

Since these SMD transistors give strange diode check readings, I will 
cross-check against the other two color output transitors and see...
Phil Bader

Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx



John @ Myers TV wrote:

>Phil,
>
>How'd you make out checking the transistors on the green output (Q605, 
>Q616, Q617)?
>
>
>John Myers
>Myers TV Service Co.
>376 E. State St.
>Alliance, OH 44601
>
>Voice / Fax: 330-821-6545
>Myers_tv_b@xxxxxxxxxxxxx
>http://www.myerstv.net
>
>Work as if you were to live a hundred years,
>Pray as if you were to die tomorrow.
>                           Ben Franklin
>
>
>
>
>Phil Bader wrote:
>
>  
>
>>update:
>>On the small signal (main) board,I found the jungle chip IC600 
>>(TA8845AN/483531057458) outputs R,G,B on pins 18,19,20 repectively. 
>>Powered up and running, all 3 pins have same correct DC voltages. from 
>>here, the 3 signals go thru a series of components including SMD 
>>transistors, green buffer Q616, green clipper Q617, finally green driver 
>>Q605 (other colors have same arrangement) From the last in line, green 
>>drive Q605 outputs from it's emitter  to connector J608 pin 5 (yellow 
>>plug) where it go up to the green CRT board, and is "daisey chained" to 
>>the other two CRTs. At this connector J608 is where the wide 
>>discrepencies are.
>>J608  pin7(R) is almost zero vdc, pin5 (G) is +11.5VDC, and pin3(B) is 
>>zero VDC.
>>So green is way up there. Preblem appears to be between where they leave 
>>IC600 and where they exit the board to the CRTs.
>>But these are mostly all SMD, at front of board underneath, and running 
>>the set to take readings is hard.
>>Tritronics has this board (or says their ASG119-TRI is a replacement 
>>for) this main board at $99.95 exchange.
>>Am I foolish to persue component level repairs here?
>>Any TS-ing assist appreciated.
>>Phil Bader
>>
>>Philip Bader
>>Jan Phyl TV Inc. (estab. 1976)
>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>Fax (863) 299-8821
>>email: tjanphyl@xxxxxxxxxxxxxxx
>>
>>
>>
>>Phil Bader wrote:
>>
>> 
>>
>>    
>>
>>>a ten year old 46 inch projection TV.
>>>I can power it on, has a bright green raster with retrace lines, I can 
>>>see the OSD and tuner video behind the green. Has good sound. Customer 
>>>said it happened after the storms last year (hurricanes).
>>>I don't have a service manual to know where to start.
>>>Corrupted eeprom? Video driver IC?
>>>Any known issues?
>>>Phil Bader
>>>
>>>
>>>
>>>   
>>>
>>>      
>>>
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