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

  • From: "John @ Myers TV " <myers_tv_b@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 04 Jun 2005 11:00:06 -0400

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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