wrote on 7/6/2017 11:18 AM:
On Thursday, July 6, 2017 at 7:17:12 AM UTC-4, rickman wrote:
wrote on 7/6/2017 1:00 AM:
On Wednesday, July 5, 2017 at 9:34:41 AM UTC-4, wrote:
On Wednesday, July 5, 2017 at 3:39:44 AM UTC-4, John Robertson wrote:
On 2017/07/05 12:35 AM, wrote:
And if it has a large value (1000-4700uF) cap inside the feedback loop that is failing, that can cause severe linearity issues.

G²


Granted, however the OP did say he recapped the monitor and I didn't
want to doubt his statement.

John ;-#)#

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its an IC, an LA7833( nte1773) . i'll change it out and see what happens. i did change out every cap, and it was exactly the same. no better, no worse.

thanks much

just got done replacing the vertical IC, la7833. no change in the image. no better, no worse.

Looks like the 24 volt supply is generated by doubling the 12 volt supply.
Measure the 24 volt supply at pin 6. I bet something is wrong that this is
only 12 volts, maybe the diode?

--

Rick C


https://na.suzohapp.com/pdf/service_...vp2_manual.pdf

https://na.suzohapp.com/pdf/service_..._schematic.pdf

B+ is 12v3, 12V and 24V good. i was thinking yoke, but they ohm out good, and look like brand new. no physical damage. looks like a few transistors are after the vertical ic, i'm looking at them now. not real good at following this schematic, so any help is appreciated.

I'm not so good at following this schematic myself. It looks like W402 is
the connector to the yoke. If so, I would say Q404 sets the vertical
position. Q360 and D307 link the vertical drive signal to I201, the color
gun controller. Perhaps this is creating too large a load from a bad part,
so the drive is clipped?

Did you say I302 pin 2 has a square wave on it? Shouldn't that be a sawtooth?

--

Rick C