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Search: Posts Made By: caboose1835
Forum: Troubleshooting Computer Displays 10-16-2019, 08:14 AM
Replies: 43
Views: 1,603
Posted By caboose1835
Forum: Troubleshooting Computer Displays 10-04-2019, 10:53 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Is there a part that needs replacing you think?
Forum: Troubleshooting Computer Displays 09-27-2019, 11:22 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

A little unclear about what Im reading, is there something I can test?
Forum: Troubleshooting Computer Displays 09-23-2019, 04:54 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

CN600

Key 1 (Pin 11) ON 3.066V OFF 0.157
Key 2 (Pin 12) ON 1.812V OFF 0V
Forum: Troubleshooting Computer Displays 09-23-2019, 01:47 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Shorting the Base and Emittor on Q601 turned on the backlights
Forum: Troubleshooting Computer Displays 09-15-2019, 04:24 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Forum: Troubleshooting Computer Displays 09-12-2019, 11:47 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

I had 5.21V on one side of R600, and 0.805V on the over. Shorting the Base to ground worked, but when I did it through my multimeter continuity setting it flickered quietly, and when I used a...
Forum: Troubleshooting Computer Displays 09-10-2019, 03:55 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

unfortunately, Nothing. I listen to the transformer for a change after touching the switch. However I just tested the LED with a 9v battery and a 1k resistor and it works.

When I mean the ON...
Forum: Troubleshooting Computer Displays 09-10-2019, 03:38 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Sorry about that, slipped my mind.

Corrected now except for Q206. I tried looking for a datasheet, and couldn't find one. Is that 2 transistors in a DIP6 package?

R600
6.48k ohm

Q601
E/C...
Forum: Troubleshooting Computer Displays 09-10-2019, 03:14 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Q202,204,205,206. First reading in ON state, second reading in OFF state.

Q202

E 0---0
B 0.467---0.653
C 0.049---0.023


Q204
Forum: Troubleshooting Computer Displays 09-10-2019, 02:40 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

My apologies for CN400. I do not have +5V to GND on Pins 1,2,3. I tested that as Pins 1,2,3 to 5.1V not to GND.

Q601
On---Off
1.0.00---0.00
2.0.028-0.033---0.625
3.0.027---0.800

Pin 2 on...
Forum: Troubleshooting Computer Displays 09-09-2019, 10:59 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Q601
Base/Emitter : ON 0.618V Off 0.068V
Base/Collector : ON 0.156V Off 0.038V

CN400
Pin 1-3: 5.21V
Forum: Troubleshooting Computer Displays 09-09-2019, 10:44 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

logic board photos
Forum: Troubleshooting Computer Displays 09-09-2019, 10:27 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

I actually just checked IC601 IAW section 4-2 of the service manual, with the monitor in the ON state.

IC 601
Pin 1 GND
Pin 2 3.296V
Pin 3 5.21V
Tab 3.29V

Capacitors
C628 5.21V
Forum: Troubleshooting Computer Displays 09-09-2019, 09:44 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Alright. Back after some more tests.

Backlight works. Theres no doubt about that.

The backlight worked with a 1k resistor between Pin 5 and Pin 8 but It was giving off a weird sound but the...
Forum: Troubleshooting Computer Displays 09-09-2019, 02:22 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Yeah i think its the same manual. Do you know what I should look at to determine the cause of the backlight circuit to not function?

Also, I have plugged it into a computer and shined a light but...
Forum: Troubleshooting Computer Displays 09-08-2019, 03:43 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Would this help at all?

http://www.go-gddq.com/upload/2011-02/11022010295520.pdf

Thats the pdf for the service manual
Forum: Troubleshooting Computer Displays 09-08-2019, 03:27 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

never knew an LED could cause the monitor to not work.

Also if I have an issue with the backlight circuit, shouldnt I still be able to get an image on the screen if I shine a light at it?
Forum: Troubleshooting Computer Displays 09-08-2019, 02:47 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

CN3 - While holding down the power switch
1 GND
2 1.814
3 0.157
4 2.196
5 3.313
Forum: Troubleshooting Computer Displays 09-08-2019, 02:34 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Ah shit. Ill need more hands for this. Will report back on voltage on CN3 while holding down the button.

Also the monitor does seem to "turn on" but nothing happens upfront. No LED no image...
Forum: Troubleshooting Computer Displays 09-08-2019, 02:10 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

I just got all voltages for every pin on CN2,3 in on and off states

Pin On-----Off
CN2

0.047-----3.649
13.37-----13.86
GND-----GND
0.000-----0.000 (GND)
5.21-----5.21
Forum: Troubleshooting Computer Displays 09-08-2019, 05:02 AM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

This test was done with all connectors in place.

Assuming you meant CN3, not CN102 (DVI COnnector) I tested Pin 5 to GND and got 3.070V in the off state, and then 0.157V when I turned on the...
Forum: Troubleshooting Computer Displays 09-08-2019, 04:47 AM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

CN102 is the DVI connector. Do you mean CN3, the control panel buttons connector?
Forum: Troubleshooting Computer Displays 09-07-2019, 07:09 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Pin 1 0.045
Pin 2 13.23
Pin 3 GND 0.000
Pin 4 GND 0.000
Pin 5 5.21
Pin 6 5.21
Pin 7 0.043
Pin 8 0.025
Pin 9 3.313
Pin 10 2.23.
Forum: Troubleshooting Computer Displays 09-07-2019, 02:38 PM
Replies: 43
Views: 1,603
Posted By caboose1835
Re: Need help with Samsung T220

Here are the picture of the Power board

Edit: I have changed caps, C301, 302, 112, 116, 113, 108, 119, 118, 107, 114. I have also changed bridge rectifier at D101 near the big capacitor.

The...
Showing results 1 to 25 of 27

 
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