CRT TV Repair

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retrogizmo
Posts: 32
Joined: Thu Jun 29, 2017 10:29 am

Re: CRT TV Repair

Post by retrogizmo »

MKL wrote: ↑Mon Oct 27, 2025 4:45 pm
retrogizmo wrote: ↑Mon Oct 27, 2025 3:38 pm Ok, I will give that a try. I'm getting 125V +B with no load
Was that with jumper on PS801 and pin 4 of FBT desoldered? If so, resolder pin 4 and desolder the HOT (Q802) and see if you still have 125V.
Just with PS801 open. I'll get myself a bulb sorted and go through the tests mentioned above and report back! :)
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retrogizmo
Posts: 32
Joined: Thu Jun 29, 2017 10:29 am

Re: CRT TV Repair

Post by retrogizmo »

Does the wattage of the bulb matter? I see people saying to use 60w or 100w as this is reasonable as a dummy load for the expected draw on +B. Getting an old style tungsten bulb doesn’t appear to be easy these days…
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MKL
Posts: 453
Joined: Wed Feb 02, 2005 9:33 pm
Location: Pordenone, Italy

Re: CRT TV Repair

Post by MKL »

https://www.ebay.co.uk/itm/365844292744
https://www.ebay.co.uk/itm/204401770425
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retrogizmo
Posts: 32
Joined: Thu Jun 29, 2017 10:29 am

Re: CRT TV Repair

Post by retrogizmo »

Ah, eBay! Yes, there are some 60w in the UK. Done.
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Z-boy
Posts: 1
Joined: Fri Jan 16, 2026 2:29 am

Re: CRT TV Repair

Post by Z-boy »

This Is My first time on this forum,

I am currently trying to repair my RGB-modded Sony Trinitron 20m42; the jungle chip is CXA2061S. The problem I am having is that everything works except the HSIZE/EW adjustment in the service menu. That includes the HSCRL. I am trying to find out if this is just a dummy control and, if not, how to fix it. I am pretty sure I have adjusted it before, but I am not sure. Any help would be appreciated! thank you

Z-boy
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Hoagtech
Posts: 1025
Joined: Mon Apr 27, 2015 3:53 am
Location: Bellingham, WA

Re: CRT TV Repair

Post by Hoagtech »

Make sure your service menu is at factory defaults to rule out a previous service adjustment.

This can be factory reset settings in service or you can find default values in the service menu
Copyright 1987
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KPackratt2k
Posts: 280
Joined: Sun Apr 04, 2021 11:02 pm
Location: Seattle, WA, USA

Re: CRT TV Repair

Post by KPackratt2k »

Z-boy wrote: ↑Fri Jan 16, 2026 2:37 am This Is My first time on this forum,

I am currently trying to repair my RGB-modded Sony Trinitron 20m42; the jungle chip is CXA2061S. The problem I am having is that everything works except the HSIZE/EW adjustment in the service menu. That includes the HSCRL. I am trying to find out if this is just a dummy control and, if not, how to fix it. I am pretty sure I have adjusted it before, but I am not sure. Any help would be appreciated! thank you

Z-boy
Based on my experience with modding several of these TVs, the horizontal size control in the service menu has no effect on 20" Trinitrons using the A51LDG50X picture tube, which is used on your KV-20M42.
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