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Author Topic: Monitors  (Read 7634 times)
channelmaniac
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« on: January 24, 2009, 01:50:12 AM »

Model: Wells Gardner K4600
Tip: Disassembly

First discharge the CRT, remove the anode cup, then unplug the AC cable. Next, unplug the neck board, cut the ground wire from the neck board to the wire around the tube (dag ground wire) AT the neck board. Unplug the 4 yoke wires at the yoke.

The yoke wires are color coded AND the connections are labeled. Make sure the wires line up to the markings on the board. If not, the wires will need to be put back the way they were found as they may have been flipped for proper image orientation.

Remove the neck board from the CRT, unplug the degaussing coil, then unscrew the flyback from the monitor.

At this point there are 2 things remaining: The screws holding the chassis in place and the silly width coil mounted off the chassis. Take a soldering iron and unsolder the wires to the width coil. DO NOT TRY TO REMOVE THE WIDTH COIL FROM ITS MOUNT. The cardboard tube WILL disintegrate. On the left side of the chassis will be 2 1/4" headed sheet metal screws. Remove those and the chassis will come out from the monitor frame.

Once the chassis out the 4 screws holding the plastic PC board mounts can be removed to take the chassis off the metal tray. Pull the plastic PC board mounts off the board to get it ready for cap kit installation.

To reassemble, reverse the steps!
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channelmaniac
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« Reply #1 on: January 24, 2009, 01:53:24 AM »

Model: Wells Gardner K4600
Symptom: Dark screen

A K4600 monitor has 2 different adjustments for screen "brightness." If the colors are dark then adjust the Screen control on the neckboard.

If the colors are bright but the background items are dim the Black Level control needs adjusting. This is the small trimpot on the video input daughtercard. Adjust it slightly clockwise then check the picture. It doesn't take much to adjust it.

If neither of these work then check the B+ levels, cap the monitor, and check the CRT itself to see if it has weak emissions. If the CRT is weak then hit it with a rejuvenator as a last step to revive the monitor.
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channelmaniac
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« Reply #2 on: August 08, 2011, 10:26:36 PM »

Model: G07 19"
Symptom: Will not always power up

Turn game on and the monitor will not always power up. Power cycle it a few times then it will come on. Chassis had already been capped. Checked the board for any cracks, repaired several bad solder joints, and tested. No cracks were found.
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channelmaniac
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« Reply #3 on: November 30, 2012, 11:01:05 PM »

Model: Insignia 32" LCD TV/Monitor
Symptom: Dead

Replaced 5 capacitors with excessive ESR readings and resoldered MANY bad solder joints on the power supply board. Tested.
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channelmaniac
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« Reply #4 on: July 30, 2013, 05:35:41 PM »

Model: ELO ET1537L
Symptom: Dead

Replaced blown 3A pico fuse on power supply board. Replaced multiple bad capacitors on the processor board. Tested.
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channelmaniac
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« Reply #5 on: August 08, 2013, 09:21:25 PM »

Model: Mag Innovision LT917s 900P LCD Monitor
Symptom: Screen too bright and washed out

Monitor made a loud sizzling sound. Recapped the low voltage and high voltage power supplies. Replaced 2 47uf and 1 10uf capacitors with high ESR on the controller board. Tested.
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channelmaniac
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« Reply #6 on: August 20, 2013, 06:36:48 PM »

Model: NEC MultiScan 1560V+
Symptom: Dead. Will not power on.

Resoldered several bad solder joints on the power supply board and replaced 2 47uf @ 6.3v capacitors on the controller board that had high ESR. Tested.
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channelmaniac
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« Reply #7 on: October 03, 2013, 09:16:32 PM »

Model: Effinet EFL-1801X LCD Touchscreen Monitor
Symptom: Appears dead

Replaced 4A surface mount fuse on backlight board. Tested.
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channelmaniac
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« Reply #8 on: October 03, 2013, 09:19:37 PM »

Model: Effinet EFL-1801X LCD Touchscreen Monitor
Symptom: Dead. Parts in a ziplock bag.

Two surface mount coils and the power connector were torn off the inverter board and were in a ziplock bag. The plating was missing from the torn parts. Used a Dremel tool on the parts to reveal shiny metal, tinned the parts, and reinstalled them on the board. Replaced a bad C5103 transistor and 2 blown mylar capacitors. Replaced bad 4A fuse on the inverter board. Replaced 3 bad 22uf, 1 bad 10uf, and 1 bad 100uf capacitor on the CPU board. Tested.
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channelmaniac
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« Reply #9 on: October 04, 2013, 09:02:13 PM »

Model: Acer AL2423W
Symptom: Display wobbles then scrambles after being powered on for an hour

Replaced 4 blown caps and 5 caps with high ESR on the power supply board and 1 cap with high ESR on the controller board. Tested.
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channelmaniac
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« Reply #10 on: November 28, 2013, 07:53:09 PM »

Model: IC Systems 900G 19" LCD monitor
Symptom: Dead

Replaced 1 capacitor on the power supply and 2 on the controller board that had high ESR. Tested.
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