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Four blinks of standby light with Sony Trinitron TVs are related with its vertical scanning fault. It may be due to the fault to the vertical output IC, of it does not get the proper volatage to work on. To proceed with; you must have a sound knoledge in electronics, and about the working of a picture tube based TV. If you have, just open the set, locate the vertical output section. At firs, look for any loose soldering to that section, especially to the solder terminals of vertical output IC. It is quite normal case for loose sodering to the termiminals of this IC; as it will heatup to an extent while working. Repeted heating and cooling, will make the solder terminals to get expand and contract; thus loose solder points occurs. Just resolder most of the vertical output section by applying a little more solder, whthout making any solder bridge in between close adjecent solder terminals. If this does not hel you, check the input voltage to that IC. If there is no voltage, find out the reason; resistor open; track break etc:- If there is volatege and still the problem occurs, output IC is damaged and should be replace with and identical one both in number and size. OK
The easiest way to identify the Vertical drive IC is to trace the horizontal Yoke coils to the board, the vertical coils to the board must lead to the vertical drive output where the IC is seen normally a inline IC with a heat sink.
Check if the solder joints are weak if so solder and check.
Vertical IC inside your Sony TV has damaged [shorted]. Four blinks of standby light denotes it. The number of blinks of standbylight in Sony denotes some fault, and can be determine according the the continueous blinks. In your case, the standby light will blink four times, then stop for a while and will continue to blink four times and so on. Vertical output IC should be replaced with same type and number. If you are aware in electronics and have tools, you yourself can do the work.
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There is something wrong with your set's vertical deflection. To prevent picture tube damage, the set blanks out the screen and flashes that 4-blink code. This is usually because the vertical output IC has failed or there is some other defect in the vertical output circuit, or a problem in the power supply so the vertical output isn't receiving proper voltage.
The vertical output is IC451 on the "A" board (the largest one holding most of the parts). You can try checking the solder connections to its pins, which is a common problem in all brands. Or you can try replacing the IC. But beyond that there's not much you'll be able to do without a voltmeter and the circuit diagram.
I would recommend having a professional check the TV if you want to keep it. TV service requires some special tools and experience to locate the bad parts, and there's the possibility of personal injury or causing more damage to the TV if you don't know what you're doing. Or use this as an excuse to buy a new TV. Small LCD sets are quite inexpensive now, and a new TV may be not very much more than the cost of repairing your TV.
I would look for a Vertical circuit failure. Most likely is the vertical output IC and or open resistor off the hv transformer. Definitely look for any loose solder connections around the Vertical output IC.
Hope this helps,
This indicates "vertical stop," meaning that the TV's vertical output circuit is not working. A number of thing can cause this: failure of the vertical output IC or related components; bad solder connections to the vertical output IC (a common problem); power supply trouble keeping the vertical circuit from operating (also a frequent cause). Without having the set available, it's impossible to offer any suggestions for you to attempt repairs beyond looking for bad soldering. Other troubleshooting would require the circuit diagram (often available from the internet), tools and experience working on a live chassis. If you really want to keep the set and don't feel up to self-repair, it might be worth getting an estimate from a shop. These Sonys are nice sets.
Can you please confirm the model number? The category is for KV-27S42 and you state in the title you have KV-27S46. Also, when getting the 4 blink code, do you see a horizontal line on the screen or nothing at all? The 4 blinks means no vertical sweep. This can be a bad vertical IC (what you changed already) or no power to the IC or even a bad capacitor in the same circuit. If you know how, check the supply voltage to the IC. If not present, we need to trace the supply line for that IC. I will need to consult the service manual to provide additional details. Please confirm the model so I get the correct part numbers etc.