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skimask
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« on: August 15, 2015, 06:49:35 pm » |
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Just like the title says. Picked it up on the curb side ready for the trash about a week ago. Brought it home, blew the dust out, plugged it in. Vertical is collapsed. One thin multi-colored line.
Adjusting vertical size, no fix.
Started to disassemble the monitor bracketry to get a better view of the PCB, moved wiring around, 2 out of 3 wires going to the Vert Size pot broke off the control PCB, light blue and purple, FL & FM.
Trying to figure out which wire goes where as the schematics I've got don't show wire colors...if they're even standardized on these.
And I've got no idea if these wires were broken off in the first place and just laying in their respective places or not. Could be an easy fix resoldering those 2 wires, could be a PITA fix shooting transistors later on.
If I'm reading the schematics right, FL is the wiper and I should get about 56K between that wire and pin 4 of the LC1464, and FM goes to one side of the VERT SIZE pot and should have 16VDC when powered up.
Any inputs?
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« Last Edit: August 15, 2015, 07:58:25 pm by skimask »
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skimask
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« Reply #1 on: August 15, 2015, 08:05:07 pm » |
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Update after an hour of looking...
Figured out where the VERT SIZE wires go, soldered them back on.
Made adjustments. Almost there, but not quite.
I can get the full picture, but not the full screen width. If I try to get more screen width, the picture kinda squashes on the left (bottom) side.
Vertical position adjustment (VR403) on the main PCB has no effect. Troubleshooting guide says to replace C407 for incomplete deflection. Can't find it on the main PCB.
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iankellogg
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« Reply #3 on: August 16, 2015, 10:18:38 am » |
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the audio board is probably pretty crap. might want to consider capping that monitor. Might even fix your sizing problem
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skimask
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« Reply #4 on: August 16, 2015, 11:52:52 am » |
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Oh ya, the audio is garbage for sure. Haven't looked, but wouldn't doubt if the speaker cone has separated. I've got a handful of amplifier chips laying around. Sure I can make something decent out of one of them.
Capping - That's on the agenda, eventually. Finally found C407 in the light this morning. Top of it is really crusty, and since it's sitting in there at an angle, I'd doubt crust from something else fell on it.
Gonna search around for a cap kit later today.
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iankellogg
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« Reply #5 on: August 16, 2015, 12:27:44 pm » |
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I always sell them  |
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skimask
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« Reply #6 on: August 20, 2015, 04:55:24 pm » |
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Got a site for them?
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iankellogg
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« Reply #7 on: August 20, 2015, 04:57:22 pm » |
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