Sony 'G' board, part II...the fix!
 

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.

Sony 'G' board, part II...the fix!
 

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

--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"Vector Viper" wrote in message
...
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.

Sony 'G' board, part II...the fix!
 

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!