My toshiba 42hl196 popped when I turned it on last month from the power button on the set. Got the 3 blinking red lights. Brought to a TV repair - they said it was a power supply related issue and tried replacing the ICs with a kit on the power supply (believe there were 3). This did not work. TV repair said could not get new parts - and declined to repair it. Brought tv home, and now heard the relays cycling. So I got a power supply board and swapped it out from an online company that repairs boards (tvparts for less on ebay?). Afterwards, no more relay clicking. So now I proceeded to get a seine board - as many said it went bad too - and just replacedit but still have the blinking red lights (3 times). Could use some help troubleshooting - as I feel I am on a Easter hunt - and do not want to keep replacing boards without pinpointing the problem. I have the tv back off and ready to start unplugging boards and checking what can be done. Help - thanks.
Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
If the fault is detected with SMPS [Power supply board],it will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
SOURCE: TV will not turn on Yellow power ind. Light blinks
You can't by-pass a seine module. This is a control module. They are difficult to obtain also.
SOURCE: I have a Toshiba 42hl67
Hi.
The point is that with LCD TV (which are very different from computer repair) you often need testing before finding the fault. In this case you have replaced amost everything, the fault then is either the T-con, the main boardm (which are only parts with panel and chassis that you have not replaced), or one of the parts already replaced that had failed because of incorrect installation procedure.
Since it is very easy to fry a board, and since a technician diagnosed the inverter (I assume that they tested the TV), testing will start right from the inverter. The inverter is tested reading DC in from main board to master, dc from master to slave, and AC high voltage out from slave, which hosts the oscillator section that should also be tested using an oscilloscope.
Since the TV is in forced standby (protection because the fault is detected), in order to get DC to inverter from main, the control line to correspondent DC voltage from PSU must be activated. The inverter voltage is the higher DC line from PSU. This is activated jumping the control line with the 3.3 or 5V low DC from PSU. In this way both PSU and inverter get tested. The procedure is also a superficial test for some main board functonalities. This kind of test is done with live power and involves testing high voltage lines. For safety reasons the operation must be done by a trained person.
The alternative is once again taking a chance and replacing main and T-con, but as said, that is not a good way of repairing a 42'' TV.
Here parts for this TV.
Regards.
Ginko.
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