Lab Equipment Repair Services for Educational Institutions

After this you may easily use the testing devices like multimeter to check the problem and then use your solder or replace any burnt or non-active component. The Recession time is the perfect time to get some serious Talent. You can Find out how to samsung tv repair godstone in a few days.Image result for crt repair

This Acer AJ17 Monitor came in with the complaint of wide screen and bias (line swimming) across the vertical line of the display. Although you can change the horizontal size, you just can’t make it into smaller and the horizontal size still big and curve back to the inside. You could also plainly see all the straight lines at the screen have a small wave (distortion) across it. At first I think it was brought on by a defective filtration capacitor at secondary part of the display but all the capacitors checked to be okay.

Given that all the caps examined okay, now I totally concentrate on the horizontal size and pincushion signal area. If there are any components shorted or faulty in this area, it will cause the display to go big (wide) and many times you can’t tune it back to normal size. From experienced, generally the condition was the modulation diode which have shorted or a pincushion transistor which have leaked. But both components and all the close by circuit components checked to be okay too. Applying hollywood probe to test on the anode volt quality proved it to within the right range. For your information, if the holddown or safety capacitor capacitance value out it could also cause the display to turn big but of course the high volts measured at the anode cap would be higher.

Since all the suspected components measured okay, I would then use voltage testing to locate the fault. Just before doing the voltage test, We observed that the eeprom ic is installed just beneath the picture tubing. If any eeprom ic in any monitor located under the belly of the CRT, then chances are high the data would be corrupted by the discharge of the CRT.

If you repair some of the latest type of Samsung Monitor, you will understand why because the Samsung monitor had a piece of aluminum shielding to protect the microprocessor and eeprom IC from being discharge on to it. A corrupted eeprom data could cause the mini processor to output a wrong signal to certain or all circuit. If it send a completely wrong signal to the DPMS circuit, then the keep an eye on will shutdown once the power is on.

Typically the ACER AJ17 eeprom IC part number was 24C08. I used to keep good eeprom data in my hardisk for future use just in case if there is a need to reprogram the eeprom IC. I took out the eeprom IC from the board and insert it to the center socket of the pony prog eeprom serial programmer. We then connect it to the serial port of my computer and commence to look for the good data for this model. I really do keep a lot of ACER monitor eeprom IC data. Once I got it, I actually overwrite the old data with the good data.

Leave a Reply