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M228WDP-BZ - Pure white screen. Power supply board checked. Voltages through connector to main circuit board OK. Changed main circuit board without any improvement. Need to know the voltges that should be found at the connectors from the power supply board to the screen?



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M228WDP-BZ - Pure white screen. Power supply board checked. Voltages through connector to main circuit board OK. Changed main circuit board without any improvement. Need to know the voltges that should be found at the connectors from the power supply board to the screen?


... LG 42LC7D-UB Television

The convergence board has a +20V & -20V input. The +20V is OK, but the -20V measures about 4.5V when the cable is disconnected from the convergence board. I could not find any blown fuses but R858 & R859 on the Main Power Supply Board "appear" to have been overheated. I can not tell for sure though without removing the board and without a schematic to know what their resistance values should be. Although R858 & R859 are in the immediate area, I'm not sure if they are even in the -20V circuit. Ca


Replace R858 and R859...They also go bad frequently when the STK chips fail. \012\012For everyone else...\012\012All projection TV sets have two very common problems. One is convergence ( 3D/Warped video or d ... Akai PT5598HD 55" Rear Projection HDTV-Ready Television

Visio VO420E, The left side of screen has a 6 inch wide group of colored lines, I removed the cover and the lines are directly in front of the main circuit board area (not the power supply board). Do I need to replace the whole board or is there a component that is known to cause this? I would appreciate any help you could give me.


Lines like that are almost always a bad LCD Panel, but just to test...Bring up an onscreen display (setup menu, volume bar, etc.) that originates from the TV ITSELF, not your cable, satellite, etc. You need something that intersects the area ... Vizio VO420E 42 in. LCD TV

My 42 q96 plasma strarted to lose it's picture after a while. I checked all boards for dry joints. Found I believe the startof caps bulging on power supply. Now I get what I can best describe as I have a picture but imagine in large patches colours diminished as if no power to cells it's dark in patches of the screen but the main thing it's in patches not consistent throughout the whole screen.


... Samsung Flat Panel Televisions

Hi. I have an LG 47LB9DF-UA LCD TV with a video problem. Originally, I had problem with horizontal lines, accompanied with a lag. After a short time the screen would then get multi-colored vertical lines. If I turned the tv off, then back on, the lines would be gone. If I left it on, the process would start over again. I opened the tv and found two connectors from the power supply board to the main board loose. After removing then reconnecting them several times, the problem cleared up. I l


... LG Flat Panel Televisions

I bought this N2635W it wasnt turning on. (So I thought it was the power supply) I bought a new power supply, and still didnt turn on.( So I thought it is the main control board) I bought a usded controler board, then it just turned by itself and there was only a white screen. No sound no controls responding. ( So i thought it needs a new one). I bought a new controller board from viewsonic,. Now it responds to the power button, I can turn it on and off., but still theres only a white screen


The tv Tuner signal board is the cause and the problems.That the board,where the incomming broadcasting signal cable wire plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish tv Tuner signal board for the replacement. ... ViewSonic N2635w 26 in. LCD Television

I have Samsung UN46B8000XFXZA LED TV. After power surge it will not come on. Plugging it in causes the blue power up light to come on for one second. The relay on the power supply (BN44-00270A) begins to click. The screen does not come on. All appears dead except for the clicking of the relay on the PS board ever few seconds.rnIf I unplug the connector from the power supply to the Main Unit Board (BN94-02661E) and apply 110v, the screen backlight comes on and there is no relay clicking. (


Yes based on your testing it appears that the power supply is at fault solely and you can opt to attempt a repair or replace it altogether. Unfortunately you will not be certain that the main board does not also need to be replaced until you have rep ... Samsung Flat Panel Televisions

I have a Vizio TV VO320E model that I bought with a bad image problem. I have sound and it responds to the remote. The image is white with vertical lines that move across the screen. The T-con board is attached to the LCD panel, it is a small card measuring 1 "x 16", Two flat cable going to the LCD. I do not know if the problem comes from the main board or the T-con board (attached to the LCD)? There are several main board for sale on Ebay. Can you help me determine which one is failing.


Hi.based on my experience in repairing LCD TV's according to what you describe the problem must be on the T-con board however do first some re soldering on the t-con board and re tighten all the connectors on it.A loose cable connectors could result ... Flat Panel Televisions

Power supply taking out main board


... Insignia NS-L37Q-10A 37 in. HD-Ready LCD TV

I have a LT37HVS Olevia flat-screen that has a similar problem to one of the posts. I had the same blue standby type light on the front that stays lit, but turning it on just makes this light blink, and no display. I did as the posts here sugested, peeled it apart and manually inspected all of the capacitors. To my dismay I haven't seen one yet that looks bloated or leaky. I have inspected the main power supply board, both display boards and the main board. There were a few capacitors that


If turning it on makes the light blink then its a clear case of open circuit.. Honestly there are lots of components like diodes, fuses, transistors etc., and either of them if shorted create an open circuit. I do not think this is a capacitor proble ... Olevia LT37HVS 37 in. LCD HDTV

Television Tv stuck in standby front led blinking only.Once the front led is blinking will not stop blinking by switching off with remote or side contol on tv. The only way is by removal of mains plug. Power supply used is Vestel 17ips10-3. Will change power board if this fault is caused by faulty board. Can anybody in the know confirm that the fault as explained is likely to be caused by a fault in power supply board.


... Flat Panel Televisions

I have a Olevia lt37hvs, When i plug it in the blue(olevia)light comes on then goes off and the screen will be blue for 5-6 second then go black for 1-2 seconds then screen goes blue again and it just keeps repeating this process. i hear the big transformer on the power supply clicking like its being overloaded then the screen goes black. When i disconnect the main board from the power supply the clicking and flashing stop. Any ideas?


Tried to connect again the supply for main board and disconnect the supply for the inverter board of back light. and turn on the tv, if the indicator stay the inventer board was the cause of voltage drop at the power supply board. ... Olevia LT37HVS 37 in. LCD HDTV

KLD60EX700 Sony Bravia my screen is black and the green and yellow lights are flashing at the same time. Any ideas on how to fix this? I've replace the power board and the main board because it was flashing red (3 flashes) witch turns out it was the main board not the power supply.


... Flat Panel Televisions

I have a Philips 42PFL7422D/37 42-Inch that went out a few weeks ago. After some research i figured it was the power supply board, not it. I knew it had fried some caps somewhere, replaced the master and slave inverter boards and Shazam! it worked perfect. However, when moving the set back into my living room I bummped the screen on the corner of the coffee table and cracked it. (insert explicative here) Anyway, found a used, supposedly working screen on ebay. Bought it, hooked everything up an


... Philips 42PFL7422D 42 in. LCD TV

I have a Philips 42PFL7422D/37 42-Inch that went out a few weeks ago. After some research i figured it was the power supply board, not it. I knew it had fried some caps somewhere, replaced the master and slave inverter boards and Shazam! it worked perfect. However, when moving the set back into my living room I bummped the screen on the corner of the coffee table and cracked it. (insert explicative here) Anyway, found a used, supposedly working screen on ebay. Bought it, hooked everything up and


Good day Richard!!!Actually sir there's no way of figuring out the screen whether it is good or bad unless you try to test it in actual..You said your unit is working fine now but the screen have cracked right?so you need for that TV ... Philips 42PFL7422D 42 in. LCD TV

When switching on my plasma 42pma400a ,the screen lights up for a second and then screen goes off(completely off mode) ,then led goes on orange from green.The real problem is that i dont know where is thye problem located exactly?i mean is it in the power supply board or mother board?waiting for your help in advance...cheers mate


... Hitachi 42PMA400 42 in. Plasma Television

I have smasung dlp 6756/xaa after replace SMPS main board, when i turn on the tv I got burning smell found middle of the tv section hehind screen wheel looks like electrical signal cable burned off, i already changed lamp, changed SMPS board and finally burned off cable. I am tired of this process, right after 1yrs late since i bought it starts problem. first symtom was light blinking, on and off, so i replace lamp, and changed SMPS board and more and more. some say digital board problem or so


... Samsung HLT6176S Television

I have a Samsung PS50Q97HD plasma TV that keeps blowing new boards and I don't know why. It came to me with a faulty YSUS that had damaged the VS supply section in the PSU board. I fixed the PSU and fuse and have good VS voltage now. I replaced the YSUS main. I powerd the TV and the upper YDRIVE (Yscan buffer) board chips when pop. I put this down to it getting damaged unseen when the YSUS went faulty. I replaced the YDRIVE upper with new and then the lower board went faulty too (holes blew in t


... Samsung Flat Panel Televisions

Hi, I came across one of your posts and had a question.  I have a p50hdtv10a, it  died, now the screen flickers and turns off. I've noticed that the led on the main board's power input shuts off and then a relay on the power supply clicks and the tv shuts off, the ysus board is clicking while all this goes on, the pattern of the flickering and the clicking on the ysus board are dead on. Which board could cause these symptoms?


The transfformer and Transistors on the Y sus . Replace the Y sus and you should be fine. There were 4 different Ysus boards used in that model. Contacting the guys at www.tvcir ... Flat Panel Televisions

Black screen and have sound vx42lhdtv10a(vizio 42 2008)power supply is ok(12v,24v,5v) main board have 4v and all fuses is good . my question is? how can i test my inverter board output voltage?how can


... Vizio Flat Panel Televisions

I have a SANYO DP46848, 46 inch flat screen hdtv purchased about 2 - 3 years ago. The screen goes dark on the left side (top .25% is ok). It sometimes fixes itself after an hour or so. Sometimes you can fix it by placing your hand on the dark spot for 10-15 seconds. There is a thin horizontal line about 1/4th of the way down from the top with the top of line ok when the bottom of line area goes dark. LCD Controller? or Main Board? or Power Supply or the Panel itself? I have a picture if that


Ray I have just about the same issue . But my only problem is the thin black lines. Do you think cleaning the flex cables coming off the Tcon will help at all? This is the same model DP46848 ... Flat Panel Televisions

Samsung ln40a530 Hello, I repaired the power supply on that TV. I changed four capacitor 10v 1000UF and 25v 1000UF and a small chip on the pcb QM806 (4894B: SI4894BDY equivalent) Now I have a good read on all output. Thank you for the help found here! But now I found a ground on the main board. 5volt is on the ground(short). I unsoldered some chip without result, the 5v is still on the ground. Could someone tell me what the problem might be?


HelloCheck the retifier diode for 5VDC for short. If it is OK, replace the regualtor IC [5VDC], if used. ... Samsung LN40A530 40 in. LCD TV

Dynex LCD 19-09.Nothing but a white screen.I first installed a new power supply/inverter board.White screen + audio.I have now installed a new main board.White screen,no audio.I am assuming these replacement boards are good---got from ShopJimmy.com.I am the rankest of amateurs;don't know how to test them. Thanks!


Well the only board left to replace is the LCD Controller board (TCon Board) so that must be it.\015\012I think you will find that the cheaper models of LCD tv's are not worth the trouble of fixing. The cost of new parts are almost as much as a ... Flat Panel Televisions

When switched on the sound is OK, but on the screen are seen only coloured vertical lines not very bright. Found blown capacitor 2200uF/10v from power supply board +5.4v. Changed it ,but nothing. The inverter is OK. After disconecting CN503 and turning on the TV the screen is dark,the bach lights are on and no vertical lines are seen. This problem ocured when the TV was working and the picture was good.


... Samsung LE27S73 27 in. HDTV-Ready LCD TV

I have a Hitachi plasma model# 55hdt79 that went black out. No display at all. Sound is ok. We checked the power supply unit and found out that 90v output is missing. We changed the power supply unit assuming that this is the cause, but still the 90v is missing. All the LED lights on in sequence and switch off after loading when I switch on the main power switch. This means no error. The TV can be switch on and off by the remote. Which board is probably the cause of this issue?


It sounds like the transformer on board has gone out (not the one in the power supply) and is no longer charging the panel. the board internally that holds the transformer will have a model number on it, any decent repair facility should allow you to ... Hitachi 55HDS69 55 in. Plasma Television

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