Question about Samsung 793S 17" CRT Monitor

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VERY DARK COLORS ON THE SCREEN..

TESTED THE VOLTES ON THE CRT PINS FOR THE RGB VOLTS WAS 46 V ! THE SERVICE MANUAL READ IS 10 VOLTS ON THIS PINS..PLS HELP ME
HAZEMAWAD71@YAHOO.COM

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  • hazemawad Mar 09, 2008

    thanks a lot ,,i will try this tips thanks for responsing fast

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Check power section the brightness control transistor could be open.The voltages are ok on rgb.check heater voltage
Hope this be of initial help/idea. Pls post back as requested, how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FIXYA.

Posted on Mar 08, 2008

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Monitor is dark


I assume that 'clears' means brightens?

The cathode heater is often supplied with a filtered DC voltage of 6-12 volts.

Often, there is a capacitor on a board plugged directly on the base of the CRT and if this fails, its capacitance becomes unstable and insufficient to adequately filter the voltage and supply clean DC.
In some monitors, the capacitor may be on the main board instead of the base of the CRT.

A technician should locate (not difficult) the CRT heater pins if not marked, and determine where the filter capacitor is located, measure it for capacitance and replace it if needed.

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- A bended color pin at the VGA connector. (If pin one is bend then there would be no red color)

- A defective VGA signal cable. If the internal wires were broken then there would be missing colors. You can check if the signal cable is good or bad by doing a continuity test using a multimeter.

- Dry joints in the CRT board such as in the CRT socket pins, video pre amp and driver IC and even at the connector pins. In fact this problem contributed about 80% of Monitor color problems. Applying fresh solder would usually solve the color problem.

- A defective IC either in the Video Pre-amp or Video Driver IC.

- Faulty components in the CRT board. It could be a shorted driver transistor or even electrolytic capacitors that the ESR reading had shot up!

- A bad CRT socket. Sometimes decayed glue could cause the internal pins rusted and thus affecting the colors. Replacing only the CRT socket would definitely solve the problem.

- A weak or a defective picture tube (CRT tube). Yes, I do came across one of the electron gun (most probably the cathode materials had used up) in the tube faulty caused a missing color in the screen. There’s no way to repair this type of problem-the only way is to replace the CRT tube.

- In the newer type of Monitor, color setting is save in the EEPROM IC . Thus, if the EEprom data is corrupted, you would also get a missing color! The only way to repair it is to reprogram the IC or use a soft jig to tune it back the color setting.



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