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Author Topic: Kortek KT1982s CRT - getting power but black screen  (Read 9414 times)

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Offline shortrackskater

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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #20 on: November 07, 2016, 05:03:15 PM »
I did two nights ago. I looked up that number and just couldn't see it. In fact I looked up the part to see the configuration of it. I can try a forth time - maybe 4's a charm!
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #21 on: November 08, 2016, 06:40:41 PM »
I found a Q714 with that is a 10N60. It's on the big heat sync that goes around the flyback.
I do get a continuous beep on one leg.
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #22 on: November 09, 2016, 06:57:54 PM »
REPLY FROM kforman:

hey Mark!  yippy you found the HOT!!!  sorry it didn't match the schematics i provided, sent you on a bit of a goose chase.  :duh:   i was going to suggest you search the heat sink's around the flyback as the HOT is always mounted near the flyback on a large heat sink so good job sir!!  :applause:


you can't do any harm by replacing electrolytic capacitors, i used to change any and all that i had good replacements for when i had a board on my bench whether they looked or tested bad or not.  always remember to keep the microfarad value the same as the original cap but you can go up in voltage with no worries...e.g. old cap is 10mf/100V i would replace with 10mf/150V if i had it.


i would still suspect your HOT is bad, you could take it out of the board and test it again.  i know it doesn't make sense but it's possible another component is causing a bad test in circuit.
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #23 on: November 09, 2016, 08:06:02 PM »
It's out of the circuit. And I still get a beep on one of the outside leads.
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #24 on: November 09, 2016, 08:09:09 PM »
I don't think that's the HOT, they are much bigger, like 5/8" wide and an inch tall

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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #25 on: November 14, 2016, 06:16:57 PM »
Wish I knew what I was doing here... tempted to just pitch this in a dumpster.
« Last Edit: November 15, 2016, 06:07:33 PM by shortrackskater »
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #26 on: November 15, 2016, 06:07:51 PM »
The UTC 10N60 is a high voltage and high current power MOSFET, designed to have better characteristics, such as fast switching time, low gate charge, low on-state resistance and have a high rugged avalanche characteristics. This power MOSFET is usually used at high speed switching applications in power supplies, PWM motor controls, high efficient DC to DC converters and bridge circuits.
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #27 on: November 28, 2016, 09:08:17 PM »
Looked and looked and looked. I can find all the Q's close it but not Q I'm looking for!  :hissyfit:


 :Scratch-Head:   can you locate a large transistor near the flyback?  try to get the part number off of it...the schematic shows Q704 as an SSS10N60 part number, maybe you can identify it that way?  :banghead: :arrowthruhead:

The new transistor is in. I installed the CRT, powered up and got a steady, yet quiet static zaps. And I still had a black screen. I am 99.9% certain I got all the wires back in their spots. They all kind of fell in place.
Forget what I said about the static zap... the CRT wasn't fully plugged in!  :banghead:
So now it's back to black. Again... the touch screen has power but there's no light in front where the video controls are.
« Last Edit: December 05, 2016, 05:34:29 PM by shortrackskater »
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Re: Kortek KT1982s CRT - getting power but black screen
« Reply #28 on: December 07, 2016, 07:33:41 PM »
The CRT went to the recycling center.  :pos_computer: 
I put the touch screen control board on eBay and gave the plug from the chassis to Gary. 
CRT problem solved!  :propeller:
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