What tv brand do you most common repair ?

[KvnTM]

Re: What tv brand do you most common repair ?

Anyone remember Philips QFU chassis boards?
Worst of the worst in my opinion. Built to fail.

[Unspun01]

Re: What tv brand do you most common repair ?

Are those failed panels made by Samsung? Lots of the big panels used in Samsung are made by Sharp.

Are you suggesting that Samsung panels are more reliable than Sharp panels?

Samsung panels are certainly less reliable than Sharp panels.

Early model Sharp panels of all sizes (Pre-2015) were very reliable unless it had a rock thrown into the screen. Later model SHARP TVs (2016-newer) are no longer made by SHARP but they have licensed out the SHARP name to cheap Chinese junk manufacturers since about 2016. Who knows who manufactures the panels in newer SHARP TVs anymore?

Samsung panels from 2007-2012 commonly suffer from defective TAB bonds and were especially damaging to SONY and Toshiba brands because SONY and Toshiba do not manufacturer their own panels and used Samsung panels in their 40", 46" and 52" models. These Samsung designed panels often suffered tab bond problems and while Samsung panels were the problem, it dragged SONY and Toshiba names through the mud. Repair was hit-and-miss with no long-term reliability.

Surprisingly, Samsung didn't even use their own panels in some of their 46" TVs (I've seen many AUO panels in 2008-2011 Samsung 46" LN-46BXXX TVs) and you could have two identical TV models numbers but the Samsung panel TVs with bad tab bonds failed, while the AUO panels were more reliable).

Early model SHARP panels (pre-2015) are highly reliable. Anything newer is likely cheap Chinese junk made under a "licensed" Sharp name, but have nothing to do with SHARP.

Early 70" and 80" Sharp panels such LC-70LE632, LC-70LE633, LC-80LE632, LC-80LE633 models are practically the holy grail of bulletproof TVs.

An exception is the well known failures of the newer model 70" Sharp and 70" Vizio panels due to bad horizontal driver ICs. Luckily they are redundant, and many have had good success fixing them for free...

In my opinion, Sharp panels are better than Samsung panels. But I like Samsung's SmartTV interface better than Sharp.

[budm]

Re: What tv brand do you most common repair ?

Are those failed panels made by Samsung? Lots of the big panels used in Samsung are made by Sharp.

[brucetv]

Re: What tv brand do you most common repair ?

Here comes the Samsung's coming in with bad panels more and more now. Seems like quality control at the panel plant really blows lately. Mostly burnt ic's in the side tabs causing horizontal lines in a other wise nice picture. Sucks Samsung as I have been plugging your Tv's for years compared the to rest of the crap I'm seeing. Lot's of TCL's with bad backlights and the panels are so delicate I quit doing BL repairs on that trash. And Sony, my God what kind of trash you spewing out lately. XBR series with a external power supply? 8000 and 9000 top of the line series Samsung's coming in with bad panels and blown backlights after 2 years? No wonder Samsung profits are down. I am seeing a improvement in LG tv's as we are seeing less and less so keep up the good work LG. But let's get that vertical bonding lines out of those OLED's please. Wal Mart is spewing out crap like TCL and ONN and the quality just makes me want to puke. Please people do not waste your money on those 2 brands especially. Pure Chinese junk.

[nomoresonys]

Re: What tv brand do you most common repair ?

After all I've seen in the last few years, I'm changing my screen name to nomoresammys.

[ivtec]

Re: What tv brand do you most common repair ?

I see Samsung, Sony, LG, Toshiba and Sharp. I see a lot more Sonic, Teac, medion, TCL etc, but don't want them, no hope for obtaining service information.

I like Samsungs because they are repairable most of the time. It might be that the quantity of Samsungs sold means repairers get to see more of them compared to other brands. Most times there is a service manual around (which never describes all the boards in there).

=======
Samsung = Bad caps, Bad TCons, Bad PFC fets, blown up 8 pin dip high voltage switch mode chips, bad tabs, bad tab chips and bad main boards. Gecko sized entry points to the back of the screen.
=======
Sony = Really bad dry jointed tab chips, Bad tabs, Bad TCons. Easy at the moment to pickup 46inch screens for next to nothing with bizarre colour issues due to dry jointed tab bond chips
=======
LG = Bad P/S caps, Bad Main board caps, Bad Main board blocking diodes, Bad main board BGA soldering, sometimes Bad Samsung TCons, Bad mounting and insulation of high voltage areas. Seen some that had burst into flame and eaten the P/S PCB. Loved the obscurely worded service bulletin issued about it.
=======
Sharp -= Bad front end fets on power supplies (living the dream at 240v here)
=======

Wouldn't touch generics which surprisingly includes JVC these days. Toshiba is falling off my desirable list as well, the last two opened had nothing Toshiba in them. Asked for a Toshiba main board quote for replacement and the "proper" techs wouldn't even guarantee the new replacement would run either (the last ones they'd got in were faulty).

So comes the devil and choose these days?

[nomoresonys]

Re: What tv brand do you most common repair ?

Vizio oh oh"s, then Samsung, LG, Panasonic, Hitachi, Sanyo, Toshiba's. In that order. We are pulling at least one panel a day now to change out cheap ass backlights. Shit's getting old.

How can you tell the cheap ass led strips from the good ones? is there a certain brand to look for?

[handsworth]

Re: What tv brand do you most common repair ?

I love pulling panels to replace leds. LG and Vizio takes about an hour. Samsung are easy once you get to them. I stay away from the off brands. Too many screws or too much tape.

[brucetv]

Re: What tv brand do you most common repair ?

Vizio oh oh"s, then Samsung, LG, Panasonic, Hitachi, Sanyo, Toshiba's. In that order. We are pulling at least one panel a day now to change out cheap ass backlights. Shit's getting old.

[R_J]

Re: What tv brand do you most common repair ?

Jeff1... start a new thread with some pictures of what we are dealing with and people will help you. Like you were asked to in this thread https://www.badcaps.net/forum/showth...c52d77x&page=5

[saddle_au]

Re: What tv brand do you most common repair ?

Check D155 Zener on the Key Unit.

Check the stability of the 5 volt standby regulator (the high voltage switcher).

[Jeff1]

Re: What tv brand do you most common repair ?

Hi I have a sharp tv model ic52d77x that when I turn it on it runs for a minute or so then turns off ( no power light or flashing light) after a couple of minutes it will turn back on by itself and start the whole process over. When it turns of there is a loud click like a relay turning off. Have you came across something like this before?

[Jeff1]

Re: What tv brand do you most common repair ?

Generally found Samsung to be the worst, off-brand next, then LG/Panasonic/Sharp/etc.
I repair others more, but only because I actively seek them out.

Hi I have a sharp tv model ic52d77x that when I turn it on it runs for a minute or so then turns off ( no power light or flashing light) after a couple of minutes it will turn back on by itself and start the whole process over. When it turns of there is a loud click like a relay turning off. Have you came across something like this before?

Thanks
Jeff

[zape]

Re: What tv brand do you most common repair ?

This picture should also be here I guess

[zape]

Re: What tv brand do you most common repair ?

Here is my short list:

Westinghouse ltv-32w1
Vizio GV42L
SONY KDL-46NX800
Samsung LN52A630M1FXZA
Protron PLTV-3250
Philips 32PFL3504D/F7
Viewsonic n2635w
Olevia 237-T12
Samsung PN63B590T5FXZA
Magnavox 40ME324V/F7
Magnavox 32MF231D/37
LG 47LC7DF

Funai is in the lead!

[pacific52]

Re: What tv brand do you most common repair ?

#1 samflung
#2 vizio

[saddle_au]

Re: What tv brand do you most common repair ?

Learnt something new today. The inter-layer connections in the BGA chips themselves can be faulty. Heating the package only temporarily cures them as well (maybe). Eutectic tin/lead solder bumps.

We've had good results with the BGA problems by not allowing the chips to get that hot again, putting in active cooling. Usually PC video card heatsinks and fans thermally bonded to the processors, especially since the LG 560 and 650 series Tvs.

[llonen]

Re: What tv brand do you most common repair ?

Vestel chassis make up a larger proportion of the television part of repair work that comes through my workshop, that said televisions make up around a third of the repair services that I offer.

Rework of BGA / FBGA via re-flow and or re-balling tends not to offer a long term repair as the failure mode is often the eutectic bumps within the packages themselves where cracks initiate and propagate through the intermetallics and at the intermetallics/solder interface rather than the solder-balls. The only 'reliable' repair option for these failures being device replacement assuming the components themselves can be sourced.

[saddle_au]

Re: What tv brand do you most common repair ?

My experience is the brand reliability is defined by how many fail. New TVs are failing more around here more due to broken screens that failed electronics. Small bumps are breaking 50 inch and above screens really easily.

If you look inside the latest models, they have all gone for minimal structural support of the screens (weight) and more complex single chip boards. I have two LG 32 inch 720p LCD screens that weigh over 25kg each (cannot give them away, don't want to chuck them, nothing wrong), compare that to the current 32 inch LCDs under 3kg. The metal supports in there are numerous and thick. Complexity of the circuits seems to be decreasing, but this is due to both complexity of individual parts going up and the load requirements of power supplies becoming less.

More and more BGA parts, integrated TCONs on panels and boards that don't run for any obvious reason (bad eeprom settings, bad flash or micro code) are on the increase and these are proving difficult to cure.

Looking around my workshop, I see many boards that have soldering hassles under hot BGA chips causing a lot of LG problems. Fixing these is dubious because just reheating them does not permanently cure the original fault which is thermal expansion and contraction problems between the PCB and the chip. You need to remove it, clean the solder and use new solder balls - not a job for a hobbyist or small repair shop because each chip has different layouts, you need masks for each and BGA heating tables to do it right. Many boards have parts on the other side of the PCB under the BGA, making that fix difficult even with the right equipment.

[caphair]

Re: What tv brand do you most common repair ?

Not to open up an old thread but I'm curious, what makes some brands worst than others exactly?

If is the over all circuit board design or the individual components? I feel the components aren't as crucial as say the circuit design ie better filtering, smoother output voltages, less stress on transistors etc?