dbguerrero: Tried to find a better place to ask question but no go. Have replaced
obvious burned backlight inverter and now new board overheats too (still
functional, unplugged TV). LG 42LG30 - is this more likely due to bad part
in the power PCB or the main board PCB? Realize no guarantee just if you
had no ability to replace anything beyond a whole board, which board more
likely has the bad part?
XxGingerSharkxX Games: Thank you for this video. The other day when I went to visit my dad at his
office, I found that the town started to drop off their old and none
working tech for proper disposal around the corner. there I found the same
TV you are working on. The screen was in perfect shape but the base was
gone and the remote and power cable as well. I would have to guess that the
original owner had it mounted on the wall and did bother to see how to fix
it. I got into it and found the same two capacitors you found and there
online I found that people are sell repair kits for this model of TV and
they are just the capacitors. I'm in college and money is tight, so if i
just need to replace those two to get a working $500 HDTV for just around
$16, that's perfect. Just wish it went to 1080p and not 1080i.
Oh well! beggars can't be choosers.
thank you for posting this video.
FREDDIE MAXWELL: Hello Dave...Love watching your videos. Thanks for sharing your wealth of
practical knowledge for us to learn from...
I'm an 'Old School' ham radio operator (Inactive) but still hold my
license...Tube equipment was still popular when I got into electronics and
radio in the early 70's.
I just started playing around with these LCD TV's & Monitors. I'm a
volunteer at a electronics recycling center and I'm seeing a lot of these
modern TV's showing up all the time. Some of them are only a couple years
old. I asked my manager if it would ok for me to load them up in my truck
and take em home to see if I can get them going...He said...Sure go right
Anyways...I just got done working on the same Polaroid 32" like the one at
the beginning of this video...I spent almost an hour trying to get inside
the darn thing...
Removed around 20 screws and still couldn't figure out how to get to the
Well of course you're probably having a little laugh right about now and so
was I when I realized it was as easy as removing 4 screws. I gotta say this
Polaroid is a very well thought out design for ease of servicing.
I found the same 2 caps were bad in my set...I replaced them and the set
came to life and working fine, guess those transistors on the heat sink
were okay, but now I'm wondering if it will stay working, or should I
consider replacing them so the same thing won't happen again? Did the caps
fail and take out the transistors or the other way round?
I have some questions about an LG 32" model that I will post for you
Thanks again...Freddie (WB9RTZ)
Tim Hoad: could you let me know what the two transistors where you replaced, i have
the same set, one of the caps was swollen, and the other was reading 8pf as
you know should be 10uf 450v, i guessin one the transistors is failing.
mustwatchtv1: thank you so much....wound up being 2 capacitors and 2 transisters
mustwatchtv1: I find this also very interesting, and great work,I have the same tv as in
your video on my power supply I changed 2 very blown caps and I also
changed the f2 fuse and now the f2 blows as soon as I plug it in without
any other connection to the power supply ,this does make me believe that
the problem is somewhere on the power supply,how do I check the
transisters,3 points what reading should I get with my ohm meter...thanks
for any info
Grants Pass TV Repair: @svolkmire Sorry but I don't have a schematic on your ipos. You will need
to contact the manufacturer and see if they can sell you a schematic. Also
keep in mind when a resistor goes bad there could be an additional reason
rsellem0815: Before I replaced the capacitors the picture was black and white. I turned
the tv on last night and for less then a minute the color worked then it
went back to black and white. I have a repair kit for the tv should I just
go ahead and replace all of the capacitors? To fix the color problem?
Grants Pass TV Repair: I don't know the answer to your symptom but there are no horizontal drivers
as your use to seeing in CRT TVs, .
Jonny Hollywood: @JonathonBlanton Its a 42 " LCD Vizio.. SVT Series if that matters
Grants Pass TV Repair: @Maxxarcade My friend John mentioned he had much fewer come backs when he
used standard radial caps rather than surface mounts. I guess you can't
always find the room for the larger ones but it sound like a better choice
Maxxarcade: Nice repair! You seem to get a lot of Polaroid sets over there. I'll be
diving into some control boards this weekend to replace several SMD caps. I
hope to get a video or two in the process.
ar15gringo: I have a TDX-03211C with the exact same problem. One visible bad cap in the
same place. I replaced both caps and now my tv powers but no display. The
power board light flashes on and off. Could you tell me where to order the
other parts that may fix this tv? Thanks
Grants Pass TV Repair: @Lavinco I replaced the transistors not the transformers. The Transistors I
replaced in this TV were Two N channel Mosfets. location was Q17 AND Q18
Both part numbers were FQPF9N50CF It's been a while but think I found them
SchrodingersQuark: I have a Dell W3207C that turns on and then goes off. The LED flashes
amber. No click noise or noise in general. I can see the screen backlight
turn on, LED is solid blue, then the backlight turns off and LED flashes
amber. I was told I should replace my mainboard. It once turned on to the
Dell logo floating around but never again. I opened and inspected the
mainboard and power supply but found no obvious defective parts.... should
I order the mainboard and give it a try?
harvjp: Can you just check the voltage output of the power connector(s) leaving the
SMPS board? Some of these connectors have the voltage output expected silk
screened on the PCB. If these all match the silk screened values doesn't
that indicate that the SMPS board is good?
Grants Pass TV Repair: @chevy56123 Sounds like your using a regular capacitor tester not an ESR
type which tells you a great more than the cap tester on you meter. I don't
trust capacitors that only tell you the microfarad value.
Grants Pass TV Repair: Yea it would have been nice if I had included an example of a burnt trace.
Thanks for the tip. Dave
lez briddon: I have a vestel tv like that but its psu is a 17pw16/2, it explosively
shatters its mains fuse on connection to supply. seems it boosts my
220/240v in upto 400v, then runs that into 2 more power supply circuits to
get the 24v inverter and logic supplies. I though i was clever just
switching out the first mosfet that rings the transformer and its
controller chip, bang! same effect, guess i was wrong / barking up the
wrong tree. I could just buy another psu for like $50, but i hate giving
Grants Pass TV Repair: @chevy56123 You should be able to make any capacitor work by soldering
wires to it. Did you verify the cap is bad or are you guessing because the
plastic on the end of the cap is bulged? I have never seen that cap go bad
even thought the plastic on the end appears to be swollen. If you peal the
plastic away from the aluminum body on the capacitor I bet it will look
Grants Pass TV Repair: @harvjp Yes if the voltages match up that means it's good.
charliepc56: You are a good teacher. I really enjoy your videos. In the 1980s and the
first half of the 1990s, TV repair was my hobby, and I enjoyed it very
much. Watching your videos makes me want to do that again, and I might
start back this summer.. Thanks Very much..
Grants Pass TV Repair: @MsDanijos I don't have any videos on testing regulators but many of the
three pin regulators check the same way as any bad transistor or diode.
Their junctions short out and bond as though they were a solid piece of
wire rather than a semi conductor.
Torpedoman P: Hi I have this Element model ELGFW551,it only displays half the screen in
the horizontal deflection.looks like it could be an horz. output transistor
or driver is defective. Can you tell me where I could get a schematic
diagram or have you any idea if something else could cause this issue.
Grants Pass TV Repair: @THEtechknight I believe a brand called Element has this same power supply
board and I remember seeing proview on the circuit board.
Grants Pass TV Repair: No repairmen like being defeated by a bad circuit, but from a business
standpoint if the repair takes to long it often makes more sense to take
the easy way out. and replace the whole board.
Savy Mago: Wharfedale lcd tv 32inc-L32TA6A. It has PHIHNOG SWITCHING POWER SUPPLY
BOARD-PSM210-417A-R Problem- Blinking red or blue light i find out there is
No 12von CN4 and 24v on CH5 but there is 5v on CN3. Please. advice. every
little helps. thanks
Robert Post: I have the same issue, changed the c16,c17, the 2 transistors, and f2 fuse
..... my local repairman also mentioned the d10 diode. At first, the board
gave me a flashing red light, then after parts changed no red light, but
can here a faint clicking sound coming from the transformer that is between
the 2 black heat sinks. Does it sound like the D10 diode causing this, and
if so do you have a number for the actual diode (if not I will pull the
Skipholiday: Very helpful thank you
anderson7901181: Thanks! once again a great video! Enjoy learning so much.
Grants Pass TV Repair: @vfacundo If you look at the side of the diode it will have a series of
numbers or letters. Punch those numbers into a search engine and see if you
can find a replacement. Dave
Grants Pass TV Repair: Sometimes when a capacitor goes bad it can cause a Transistor in the same
circuit to go bad. This is why I knew it was a good idea to test them. You
can test the transistors with an ohmmeter. When they go bad often times
their resistance values are less than an ohm between the transistor
Grants Pass TV Repair: @1Bakke1 You will find the values on the side of the fuses.
DCR053: this is the exact power board i am having problems with... transformer is
confirmed bad. where can i purchase a transformer for this (ipos 150
Grants Pass TV Repair: I don't know the specifics on your power supply, but as a general rule you
need to verify if the power supply has shorted components, or if your
microprocessor on the main board isn't turning it on. Can you measure a
turn on voltage on the PS on terminal on your power supply board when you
press the power on button?. It's often going to be 5 volts.
BoriJinx: i have this same tv with same problem. please email me your info do i can
take it to you if your willing yo fix it. firstname.lastname@example.org
rsellem0815: I located another bad capacitor on the circuit board, but I am having
trouble locating a store or Website that sells it. It is the big capacitor
with 150uf450wv (neg+105°c) Is there any place you could suggest? Is there
a email address I could email you at?
HK76931: yea i figured that one is totally dead but so I still have 2 boards that
get me to the blue light but no power on lol I guess I will try yet another
psu. thanks for getting back to me
Grants Pass TV Repair: I can't guess at what's wrong with your TV, but if you suspect diode D10
might be bad Why don't you test it? Someone said D10 it crosses to an ECG
576 but I haven't verified this. The numbers of the diode are on the side
aleeeeaaa: what brand capacitor checker do you use?
Grants Pass TV Repair: @ar15gringo I don't know which parts on your TV are bad but the Two
transistors I replaced on mine were ordered from digikey. The
manufacturers part numbers for both transistors is FQPF9N50CF There
location was Q17 and Q18 Test the old ones before assuming they are bad
becaues they may not be. Also scroll down in the info section of this video
and you may find some additional info which helps you.
Thom Cunningham: Just wanted to comment on the techs that do not like what you are doing. I
am a 62 year old who has been doing all types of electronics for over 35
years. I am the only tech left in NW Okla., and service about 100,000
people. My shop is so full, I can barely walk thru, with a waiting list
over a month long. I wish every customer would watch your videos before
calling me. Most would still be too intimidated to do the repair. Keep up
the good work! by the way, my brother lives in Medford.
Paul Collins: I really enjoy your video's , you sir are teaching me lots , Thank you.
Grants Pass TV Repair: Check out my web site to find a source for inverter transformers. It's TV
REPAIR INFO . COM
littlejoker0707: well i been doing things i know and then i change the capacitors that i saw
that were open so i change them but i still did not get it to turn the
screen on the power turns on but black screen. my tv is a flm-373b
Mihai Alexandru: Any suggestions to my video regarding the lcd tv backlight please?
youtube.com/watch?v=Yzd_ICYb06Q&feature=youtu.be The lamp only stays on for
3 seconds...is normal?
Grants Pass TV Repair: @BIGBOSS1983100 I start by checking power supply voltages and if it's okay
I move on to the Y and X sustain board. Often times a shorted/bad component
will cause the fuse to open on the Y or X sustain board. Once I see an open
fuse on one of there boards it gives a pretty good indication that's where
the problem is. Some people replace both of these boards as well as the
buffer board to play it safe but it's not always necessary. If you suspect
the buffer board is bad see if one IC is hot. Dave
1Bakke1: Can I get a part number on F1 and F2 thanks.
amandakaye33: Loved Video 10. Because you are working on my exact tv. Or the same power
supply board. I changed the 450uf caps and you talk about the infertor
transistors and transformers....argh...I have the tv with red led that
changes to blue led..when switched on. No pic or sound. Would you suggest
anything along your video for this problem too? Tks
Grants Pass TV Repair: You didn't say which board you replaced.