Sony 'G' board, part II...the fix!

[Vector Viper]

I have a "G" 1-659-752-21 board Q601 and Q602 blown, and replaced, with D648
(150 v protect zener)

Board works, but has almost NO regulation for +130v out...100VAC in outputs
+145V B+
Oddly, the LOAD regulation is good, pix size does not change with
brightness...

----------------------
1/6/2004
Update: problem found. it was a transformer, T603, called "PRT"
The good one reads 500uh on the primary, the bad one only 150!
It drives the output transistors through it's secodary...

Thanks for the help guys!

Aaron H.

 

[Mark D. Zacharias]

Wow. Good catch. These types of components are always the LAST ones I check.
Electrolytics, semi's and fusible devices first, then resistors, small caps,
inductors and the like.

mz

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"Vector Viper" <ahowald@w-link.net> wrote in message
news:vvn0jm3fcfom43@corp.supernews.com...

I have a "G" 1-659-752-21 board Q601 and Q602 blown, and replaced, with
D648
(150 v protect zener)

Board works, but has almost NO regulation for +130v out...100VAC in
outputs
+145V B+
Oddly, the LOAD regulation is good, pix size does not change with
brightness...

----------------------
1/6/2004
Update: problem found. it was a transformer, T603, called "PRT"
The good one reads 500uh on the primary, the bad one only 150!
It drives the output transistors through it's secodary...

Thanks for the help guys!

Aaron H.

 

[RonKZ650]

Update: problem found. it was a transformer, T603, called "PRT"
The good one reads 500uh on the primary, the bad one only 150!
It drives the output transistors through it's secodary...

Thanks for the help guys!

Wow, I was right for once!