Impromptu glarey TV video

I work in a workshop where we repair TVs among other things. If this is a Panasonic Vestel unit then Panasonic have just release a technical bulletin saying that the issue with no backlight could be related to the solder connecters for the backlights. They suggest reflowing the solder to fix it but we haven't tried it yet. Even if its not a Panasonic it still might be the same issue since all Vestel TVs are mostly the same. If anyone wants the bulletin let me know.

Yes eBay for either new or used boards. That might be a connector issue between the main control PCB and the panels PCB. It might be worth reseating them.

Big Clive

I missed this on Patreon, just watched is as it was released on YouTube. I have a computer monitor where the screen just shows solid pink. I took the back off and had a poke around but couldn’t find anything. I didn’t realise you could buy spare boards... where do you get them from? eBay?

A very interesting deviation from the normal fayre Mr Clive. Thanks for uploading.

Glen Rea

Thanks for the video Clive, I hope to see more like this.

Nuts 'n' Proud

AKA percussive maintenance.

Alice Chapman

Intermittent faults are normaly cured by the Intermittent hammer, it's called BP Theory, Brutality and Patients, If you hit it hard enough for long enough you will get a result of some kind LOL

Have you considered using a 12V/50W halogen MR16 bulb to “soak” the chip by placing the bulb a couple of cm. above it? I haven’t tried it myself, but I have seen a Youtuber use this technique several times with great success. Unfortunately, I can’t remember his name... 🤷🏼‍♂️

Bo Holbo Rasmussen

Did you get a chance to look for some of the rare, but still sought after ones? The “Service Manual wanted” list on www.elektrotanya.com is constantly growing, and as long as no one violates any NDA’s by uploading manuals for discontinued equipment, it will be greatly appreciated if someone would take the time to do so.. (I’ve certainly been grateful to have been saved several times, by that site.)🤙

Bo Holbo Rasmussen

Well, you DID mention that it is a Panasonic, and not a low- to mid-range Samsung! 😁 Speaking from my personal experience, and that of other fellow repair technicians I have spoken to over the years. (From both Panasonic Centre, and independent repair shops.) Samsung has always been experts at making planned obsolescence a part of their TV, DVR, and DVD/BLU-RAY designs. (Low- to mid-range series.)

Bo Holbo Rasmussen

When it comes to the older plasma TV’s from Samsung and (especially) Panasonic, the very first thing to check after getting the back cover off, is to check every single screw that holds a PCB for looseness. Loose screws have lead to MANY blown high voltage diodes on the driver boards. On the Panasonic TV’s in particular, loose screws leads to a LOT of noise. Enough to freeze up the processors and MCU’s scattered around the different boards. 😏 I’ve had many “repairs” where all I had to do, was to tighten those annoying self tapping machine screws.

Bo Holbo Rasmussen

Intermittent faults. 🙄 They are the bane of consumer electronics repair businesses every where! There is nothing worse than having a customer drop off a product with a fault that you can’t see or replicate. Then have your customer take it back home, and have them call you up 1-2 days later, because the fault has come back. And way too often, I find it challenging to get the customer to describe the exact circumstances leading up to the fault manifesting itself. (Has it been running all day, is it stuffed into a hot or humid cabinet etc.)

Bo Holbo Rasmussen

It's normally a break of the track between lines of LEDs inside the usually glued screen and back light.

Mike Hanley

I have looked inside a couple of modern TVs and it's surprising how little there is in any of them compared t the old CRT TVs. Saying that they do last a long time. My Panasonic TV is 20 years old now and still going.

Jeremy Travis

Very interested to see how this turns out. I don't se much TV repair work these days. My company just binned massive amounts of TV repair manuals. Almost literally a ton

Michael Thompson

Easily interesting enough to release, in my view. The only qualification on that is that (as Wim says) it would be even more interesting to wait till you have the new board and do a comparison. Always assuming the fault comes back, of course

With the new board side by side it'd be interesting to trace which components have gone out of spec.

Wim

Clive I'd release the video, mentioning the exact model of the TV and of the card too. It would help people like me, looking for correct information online. I've repaired my own Philips TV swapping the PS card, and it was a nightmare to find a reliable source.

Carlos Capriotti

Vestel are notorious for this, most of the sets sold over the last 20 years are Vestel, they produce chassis for rebranding, Toshiba, Hitachi, JVC and many more are actually Vestel inside, you can usually tell from the OSD interface, they change the colour and graphics but the options and EPG remain roughly the same. You used to be able to buy repair kits for each PSU but since Charles Hyde & Sons went out of business (due to the financial viability of repairs hitting the pan), they are no longer available the only option is to buy the discrete components and replace them. There used to be a 'wee red book' for common TV faults but I'm guessing that's gone now due to the limited repair options these days. Most kits contained caps, resistors and sometimes diodes as the majority of faults are rough power rails, if in doubt change the caps out, they might not be the root cause but they usually bring a unit back for a good while.

The Tinkering Shed

Using the metal chassis as a ground path has caused many problems in a lot of electronics.

Question for someone with reflow experience.....I found the problem chip on my 46" samsung and I'm torn between trying to reflow the chip vs the whole board having never reflowed before. What seems like a better idea 1) reflow the whole board. 2) reflow just the problem chip. I have a 3lb piece of hardened steel the same exact dimension as the chip. If I heated the steel and placed it on the chip, how hot and how long would you leave it there? The chip in question has about 200 contacts and controls vehicle lines, tap it and the problem goes away for a few minutes.

Jim

Yeah so a few minutes in an oven at temperature is a means to fix connection issues in many TV boards. Done that a bunch of times when I cannot find the exact issue.

Ryan Coleman

I've repaired a handful of modern-ish LCD TVs with intermittent/no backlight or power on/power cycling issues. In almost all cases, it starts as an intermittent problem and gets progressively worse over time. A number of times, the sets miraculously "fixed" themselves after being on the bench with the back off for a while. My hypothesis was that the marginal components on the power supply board got a chance to cool down and capacitors re-formed ever so slightly due to the thermal cycling and having the mains disconnected. More than one worked fine on the bench with the back off, only to begin acting up within minutes of having the back replaced.

Cable card... Which is basically PCMCIA

Ryan Coleman

Is that a PCMCIA or CF slot on the logic board?

Witold Witkowski