ADDED solution at the end! While whatching the TV, I heard a strong tack noise. No picture after that but sound Ok. Turned TV off then back on: would not turn on. Just a click and then, after a few seconds, one or two more clicks, then all front LEDs off, no red LED blink code. Opended up the unit and verified that the SN board had failed: short on the power connector. I replaced 3 shorted IGBT's 30F131 with compatible replacement FGD4536 plus a 4th one even if it measured Ok. Other power components did measure Ok: diodes and other IGBT's/MOSFET's. TV now works, however, depending on colors being shown and, I believe, also overall picture brightness - the amount of white - I do get magenta noisy areas, mostly in the top part of the screen, but also elsewhere. Even if the magenta is not there, the top part of the screen is noisy on close inspection. Note: while inspecting and doing the repairs I did _not_ unplug the many flat cables present towards the side of the TV. Therefore I tend to exclude problems there, no bad flat cables contacts. I did try and enter the Setup Menu and change VSUS which was HIGH to LOW: no change. I did also try and let the scrolling white bar run for about 1 hour so as to help the TV with ghost images. Didn't help either. My best guesses not having yet measured anything are: - possible degradation of the power supply, aged electrolythic capacitors; - partial damage to other components on the SN board; - FGD4536 not perfectly compatible need to replace with original components; - possible cracks in the solder of some power components like, e.g. the coil of the SN board or possibly also of other boards, I did read about this with regard to noisy pictures on Samsung Plasma TV's; - need to redo the solder of the ground connections of the SN board or at least tighten up its screws. Prior to this problem the TV was working perfectly. Did anybody experience something like this? Any ideas? TIA Stefano -- Follow-up: I redid all solder points below the screws of that board plus some solder on a few big components. After having checked the power supply and the el.caps, which were Ok, I bought a repair-kit specific for this model from eBay seller gtvwatford (article 151128828955) and replaced all but the tiny chips included in that kit, including the 4 IGBT's I had already replaced. Now the TV works perfectly. FYI: I replaced the 4 IGBT's plus 2 diodes and one more transistor by using a standard, not hot-air, soldering-iron which I had turned up to 350 degrees Celsius. Please note: that temperature is potentially harmfull to the components, however, since my gun was not high power (some 50W or less), the actual temperature of the solder was probably lower and if I had used a lower temperature, I would not have been able to reach the liquifying temperature of the solder everywhere. This allowed me to desolder those SMD components and then soldering them back with a minimum of care/hussle. In the end I also applied one small glue-on heat-synks to all the power components on that board in hope of extending their life. I hope this will help someone else out there. Good luck! I used a device identical to eBay article 254241895698 for checking most components. It was even able to check most el.caps in circuit - at least I got a clear indication that they were still Ok. Saluti!
SOURCE: Hitachi 50UX26B no picture no sound
Because D953 and D954 go dim right away indicates a short in th +27v and -27v line. The most likely suspects are IK04, IK05 (convergence output IC1s). The other suspect is I601(vertical output chip)
SOURCE: no raster, no sound on 53UWX10B
double check the wire connections, as the filaments not being lit makes me thing a wire isnt connected properly, or one may have been loosend while doing the convergence repairs.
SOURCE: My Magnavox plasma screen tv, model number:
You either have a cold solder joint in your horizontal deflection circuits or your or in your horizontal output circuit. please be careful due to the fly-back transformer still holds power even unplugged until you discharge it.( ground it out). Hope this helps.
SOURCE: I have a 3 yr. old Panasonic model # TH-50PZ80U
The full fault guide explaining this and the solution can be downloaded at
http://www.mauritron2.com/downloads/Panasonic/
while for the service manual google
mauritron.com
SOURCE: lg 52sx4d
Hello
Power supply switching regulator board inside your LG TV is faulty. There are more than 8 regulated supply rails emerges from that board, after switching regulation, which will enter to different sections of circuits in your Tv. one or tw of its output voltages are missing now, in which, voltage to sound card also will includes. In most cases, this section is replaced as card basis, rather than making "surgery" to it. Clicking noice you hear along with this is a clear indication that there is something short on that board. It will be difficult, even a trained technician to locate and rectify the fault on that board, because, most of the components on it is machine soldered, and cannot be desoldered or resoldered by normal soldereing techeniques. Moreover, some of the components in it are not easly available on open electronic spare part shops, as LG has some special transformeres of their own, which they won't deliver to the open market. So in my opinion, it is best to replace the card itslef with same type and number, Type and number will be printed on the card and can be noted. You must have testing equpments like, a good quality digital multimeter, soldering Iron, desoldering pump and the most is sound knoledge in digital electronics and enough patience. After replacement of the power board, there will have to do some adjustements, [service adjustments] to get the picture well defined.
If you have confidence and informe me by Fixya. I'll assist you. OK.
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