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As a sprog I was a telly-mender, but now . . .

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As a sprog I was a telly-mender, but now . . .

Old 11th Dec 2017, 23:48
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As a sprog I was a telly-mender, but now . . .

a friend has a panasonic tx-37lzd81 which is bust, and no one near here mends tellies.

I just can't believe it. Big-ish telly with built in dish thingy and big sound.

Throw it away! Can't be serious, surely?

I phoned a nearby company that was started by one of my contemporaries. They used to have a large workshop and trained bods, but not anymore.

Anyone have any technical knowledge of this set? I see folk advertise on ebay etc., for boards for it, but a fat lot of use if one does not know what's wrong.

The screen glows, but does not show any sign of other life. No menu etc. There is some sound, but only via a satellite box.

On start it flashes green rapidly. It flashes in response to the remote. That's it folks. :-(


Last time I was at another house - same make, I called same company. Told them six flashes = stuck in standby. R107 US or near that. Soldered it in, and away it went. They grumbled, saying the maker stipulated the price for the repair and it wasn't worth it. A clue perhaps as to why they stopped repairs.
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Old 12th Dec 2017, 00:19
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From the dates of reviews found with Google, I'm assuming the TV is over 5 years old. At this age it's a dinosaur and probably not worth fixing unless the repair cost involved is very low.

I recently binned a 3 year old Panasonic 3D flat screen as the quote to fix it was more than a new one would have cost.

I have a Samsung which is still going strong after 6 years and an LG 4K around 2 years old. Korean seems to be the way to go these days regarding value for money but some of the Chinese brands are catching up rapidly and definitely offer a lot for the asking price.
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Old 12th Dec 2017, 00:30
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Some years ago when I first acquired a smartbox I had a phase of going through the high numbered channels and watching programmes I hadnt seen in years. One day I was watching a 20 year old edition of Bullseye and "Bully's special prize" was the very make and model of TV I was watching it on!

I still think of my current non-smart, non 3D flat screen set which I bought from Comet not long before they went bust in 2012 as my "new" TV. I very much doubt if it will be still going in 15 years time (or me for that matter )
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Old 12th Dec 2017, 00:38
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Yep, just come back to the problem while trying to make meself sleep. One company has an inverter board for 19 quid. Doubt it's that, but without a few test point voltages, I'm working blind. Needless to say, most used board folk don't accept returns. One saying we don't help you to fix your telly free of charge. I can see their point.

I'll perhaps open it up and see if there's any burnt R's or fat C's. Just thought. Where do you bin something this size?

Nice lady had a Mercedes they told her to scrap. It was a smashing little 5 door and had a secondary air fan destroyed cos the relay was welded on. Nearly a grand to fix. 30 quid on ebay and 9 quid for the relay. The tough bit was finding the relay. She called me when the telly bust. - wish I had other attributes that make pretty ladies call me.
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Old 12th Dec 2017, 01:49
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Have you tried switching it off and on?

I've sometimes found that wobbling components while power is on can locate a loose connection, but I'm probably teaching you to suck eggs there.
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Old 12th Dec 2017, 02:11
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Try sending the manufacturer an email? Ask them what they think the problem is - not the address of a local repair business.
Try giving it a really good whack.
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Old 12th Dec 2017, 07:38
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Is the blinking a code?

https://www.brainchamber.com/panasonic-tv-blink-codes/
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Old 12th Dec 2017, 08:09
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Living as I do, in deepest SW France, I soon learnt that I had to become a jack-of-all-trades (master of none) to get anything done. TV repairing was added to my list a while ago. It goes without saying, 'fiddlin' wiv 'lectrics is danjerus'. In addition, your mates TV may be exceptionally unique but if you/he want to have a shot at it.....:
If you open the back, you will
probably find a direct satellite feed for Freesat which was unique at the time on this TV. You will also find a power supply board and a main AV board.
You could change each of those until you find the fault or just replace the lot for about 60. The sat input is a TNPA4661, the PSU, TNPA4677 and the main AV is a TNPH0756. If they are like other tv's they will simply attach with ribbon connecters but you can check this when you open the tv.
A search in Google on those numbers will turn up a number of suppliers on ebay and elsewhere.
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Old 12th Dec 2017, 08:15
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And this is why I do not look forward to the day when everything on my self-driving car, and all of the clever options, are electronic.
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Old 12th Dec 2017, 08:25
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21st Century economics

It is cheaper to have a 3rd world people build a new one, than have 1st world people repair an old one.

This currently applies to all electronic and electrical goods, soon coming to all your vehicles.
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Old 12th Dec 2017, 08:30
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You say the screen is glowing, turn it on hold a torch to it and can you see any image? if you can its probably the backlight or the inverter if its an LCD screen as it needs a light behind the screen to illuminate the image... think like a stain glass window.


https://www.manualslib.com/manual/81...x-32lzd81.html


also a suggestion on here including updating the firmware

https://howtomendit.com/answers.php?id=197622

THIS IS THE FIX
dry joints on the pcb resolder as many as you can
make sure tv is clicking when you press power button.
SIMPLES
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Old 12th Dec 2017, 09:20
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I had an LG with a 5-year warranty from that Better Off electronics retailer. We then upgraded to a cheap 55in TV and moved the LG to the Conservatory. It didn't work.

Worked out that in the living room it had been using a Freeview box. In its new location it relied on its built in RF Rx. 'Engineer' duly arrived and correctly diagnosed it was u/s. No shit Sherlock. After a week they confirmed it was unrepairable. Shiney new Panasonic with new 5 year guarantee delivered. Happy Customer.
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Old 12th Dec 2017, 09:23
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40 years back our valve TV started to fail. After several visits by TV man, when he knew I was reasonably able, he gave me a box of valves and these kept it going.
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Old 12th Dec 2017, 10:26
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Not neccessarily your problem.

Open it up, instructions possibly on net but most are similar.

Have a look and see if any electrolytic capacitors have failed - bulge out when it happens.

Replace same, cost pennies from component suppliers (Maplins?).

I've repaired 3 or 4 flat screen monitors, various symptoms, by doing that.
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Old 12th Dec 2017, 10:29
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Modern electronics use surface mount components and circuit boards with multiple layers of conductors, all of which make it extremely difficult to service at the component level. So, we are left with replacing large, expensive chunks, which if not covered under warranty, often end up costing close to the price of a new unit.

It is cheaper to have a 3rd world people build a new one, than have 1st world people repair an old one.
I recall my grandparents lamenting such things and referring to this practice as living in a "throwaway society".
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Old 12th Dec 2017, 10:53
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Gosh, thanks chaps. Tanker, despite timing you weren't there when I answered and there's a post missing. Most mysterious.

The fast pulse may well have a missing ON or two. I'll see if she can count fast.

One bloke on one of the links talks of a 900uf Cap popped.

Thanks strake, that could come in very handy.

Torch? I think, but not sure, that there's enough bright light seen through cracks to indicate back lighting. I'll check, thanks.


When I was a young FO, I got me a Dynatron telly in a posh box. I also got a matching speakers and Tanburg cabinet. The Hi Fi cabinet has real walnut under cheap lacquer, but I French polished the lid and it looked fantastic. Never did the rest.

The Dynatron would go wrong on a regular basis. Usually the Line time base valve load resistor. Hybrid, it was, with valves and transistors. I used to leave the soldering iron and some tools, back loose and no chassis bolts. Could have it running 10 mins after coming back from a flight. Thinks TV cabinet did fetch 20 quid when I sold up 28 years later and the Tanburg is destined for a charity shop.
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Old 12th Dec 2017, 11:03
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Not just TVs.
Our kettle has a fine mesh spout filter, which split. Found a replacement on line, 14. A new kettle is 25.
Now using the kettle minus the filter, until another bit fails.
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Old 12th Dec 2017, 11:17
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Now using the kettle minus the filter, until another bit fails.
As long as she heats and holds water, serviceable.
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Old 12th Dec 2017, 11:35
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Originally Posted by vapilot2004 View Post
As long as she heats and holds water, serviceable.
Naughty!
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Old 12th Dec 2017, 12:01
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I to started out working life mending televisions. Back in those days, before colour was invented, sets were a tad unreliable and were therefore designed to be repaired down to component level. To aid this manufacturers issued service manuals; although al you ever needed was a circuit diagram. The vast majority of sets these days see out their lives without failure. Design nowadays is all about cost reduction & inclusion of customer experience features. In many cases the build methods used preclude any sensible service functions (iphone batteries etc)
It's always worth looking to see if you can see an obvious fault - after that it becomes a bite the bullet issue.
Do I yearn for a return for the old days when TV repairing could get you as dirty as coal mining? Not a bit.
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