Hi guys and thanks for the warm welcome in the introductions section.
I mentioned that a customer had brought in an ICC19, but its actually a 24WK25UG with an ICC17 chassis.
The TV turns on, with satisfying EHT noise, then immediately trips out with a 2-7 error code, which is making me think the LOPT itself is the culprit.
I can order the original LOPT from ASWO for around £50 including postage and vat. Or I can order a LOPT kit which includes a few caps and coils for around £60.
Being a bit rusty on CRT TVs, is this a good price? Are there any other suppliers that might still supply the kit in the UK?
Thanks for any advice.
Steve.
@teletek
I don’t know anything about them but this site came up in a search.
http://www.pltv.org.uk/loptx.htm
The site doesn’t use SSL so be wary of credit info etc.
Frank
Thank you Frank, I've sent them an email 🙂
Hi Steve and welcome from me too. I'm afraid I don't know much at all about about the later ICC series chassis after the awful ICC9, I went over to Thorn's digibox repair operations around the time of the TX80, TX90E and TX92 era. I don't recall which ICC1x version it was but I was aware if the CRT hadn't built up a decent amount of beam current a few seconds after switch on the set would trip, the Videocolor CRT's used were renowned for becoming lazy to warm up after a couple of years use.
There was no modification I believe so it was either a new CRT or if it was out of warranty most customers would just cycle the mains switch a few times until the set stayed on. Not only Thomson suffered form this but also the Philips with their L01E chassis, some 32" versions also used Videocolor CRT's and only these suffered from this. Philips own CRTs of this period never went low emission or lazy, they never didn't last long enough to wear out going heater/cathode short in huge numbers.
Getting back to the fault, tripping was always terrible to find on Thomsons because of the amount of protection circuits. I would check with a scope that the field timebase is running before the set trips and see if there is any sign of the heaters lighting briefly. Good luck.
John.
Thank you John for your very helpful post. There’s a very brief flash of (full frame) brightness on the screen of the tv before tripping, but it’s so brief that I can’t draw any real conclusions from it. The customer has accepted my quote for fitting the new lopty (plus repair kit) and since the frame IC was only £1.68 (aswo) I’ll change that as well.
Some of the parts mentioned in the repair kit actually test ok, but between this and the frame IC, hopefully it cure things.
I wasn’t familiar with the ICC17 chassis either back in the day and since the lopt kit is non returnable, I sincerely hope it’s not the CRT that’s at fault.
Aswo has the kit on 3 week back-order so I’ll have to wait a while to find out!
Thanks again,
Steve.
