LCD TV Repair Made Easy # 10




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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.

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 ahead.. 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 innards. 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 later... Thanks again...Freddie (WB9RTZ) 

mustwatchtv1: thank you so much....wound up being 2 capacitors and 2 transisters thanks again

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 for it.

jmoye300: where can i get the fuse at i have look online all i can find is 3.15

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 when possible.

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 at digikey.

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 in..

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 fine.

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. Thanks

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 board again)?

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 junctions.

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 rev:1.8)

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. azotameboricua2000@yahoo.com

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 of it.

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. Paul

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.

Grants Pass TV Repair: @karkrazyhobby You can test the transistors with your ohm meter to find out if they have gone bad. Johns book on LCD TV Repair shows how you can test them.
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