Author Topic: Samsung Syncmaster 1100DF CRT monitor ("ON" issues)  (Read 190 times)

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Offline 13hm13

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Samsung Syncmaster 1100DF CRT monitor ("ON" issues)
« on: June 05, 2019, 09:30:45 pm »

I am the orig. owner of this monitor, purch'd new in Feb .2004. It has pretty low hours as it was only in active (but non-continuous) use about 1.5 years. The monitor also has an automatic "sleep" mode that will partially power down the monitor after about 15 min. of non-use.

The problem is this: the high voltage will not power on. When main pwr button (front) is pressed, a non-blinking green PWR LED will come on. But the high-voltage section does not seem to power up (or is not getting the signal to power up). Even if no video input is connected, the display should still display (e.g., message like NO VIDEO CONNECTED).

I have checked the supply pins to the logic chips (5V) and they seem fine. (The main pwr LED turns on and off as normal).
No bulging caps or signs of scoring, heat damage or other "abuse" on a visual inspection.

I have very little experience with servicing CRT monitors, so any clues as to what to inspect next is appreciated.
Thx!

Attached is the full Service Manual (PDF)
 

Offline PKTKS

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Re: Samsung Syncmaster 1100DF CRT monitor ("ON" issues)
« Reply #1 on: June 06, 2019, 02:43:02 pm »

Actually this unit puts together:

- a SYNCed PWM H driver stage
- with a front end PFC controller MC33260

this is not trivial to check as you need to safe pass check
all the flyback issues first.

checking the flyback coils and the drivers.

Certainly you will need to check some wave forms
and they are all pretty much HIGHV PULSEs

This SMPS is not something to take light
it must sync with the incoming signal as well

Paul
 

Offline 13hm13

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Re: Samsung Syncmaster 1100DF CRT monitor ("ON" issues)
« Reply #2 on: June 06, 2019, 04:07:30 pm »

Actually this unit puts together:
[...]

this is not trivial to check
I think troubleshooting this unit in the std. way is more time than I'm willing to spend.

I'm looking more for anecdotal accounts like  ...

"Yeah, we saw that often in the shop and we fixed it by [solution]"

or:

"Try checking transistor X -- is it blown?"
 

Offline PKTKS

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Re: Samsung Syncmaster 1100DF CRT monitor ("ON" issues)
« Reply #3 on: June 06, 2019, 05:03:47 pm »

I'm looking more for anecdotal accounts like  ...
"Yeah, we saw that often in the shop and we fixed it by [solution]"
or:
"Try checking transistor X -- is it blown?"

Nahh  this is monitor of high quality results.
Requires specialized technicians with some necessary skills

That pudim thing that "RECAP" or just 'REPLACE THIS...THAT .. tap.. bend.."
this is for the 5 minute corner shop

That kind of device requires a bit more - also proper equipment
and necessary caution handling it

Lucky shots are on the very bottom of the list
Paul
 


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