REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
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Wednesday, 27 February 2019

NO PICTURE. SOUND OK. FOUR BLINKS TO STANDBY LED AFTER SWITCH ON [SONY WEGA SERIES KV-HA & KV-HW SERIES TVs]

NO PICTURE. SOUND OK. FOUR BLINKS TO STANDBY LED AFTER SWITCH ON [SONY WEGA SERIES KV-HA & KV-HW SERIES TVs]

NO PICTURE. SOUND OK.  FOUR BLINKS FO STANDBY LED AFTER SWITCH ON [SONY WEGA SERIES KV-HA & KV-HW SERIES TVs]

     Set switches ON and the standby light at its front panel blinks four times, and switches OFF.  This repeats each time switch ON the set. The fault is with its vertical output section.  This model sets has Bus chassis, and a self diagnosing circuits in the system control section always look into other components’ functions, and if a malfunction is noted, the main system control IC will send a stop signal to main power supply regulator section, stops it to prevent further damage.
     The most common fault found with this type of four blinks and shut down, is due to loose solder terminals at the Vertical Output IC.  This IC [AN 5512], will heat up to an extent, screwed on to a metal heat sink to radiate heat from it while it works.  Repeated heating and cooling might make the solder terminals to this IC to get loose contacted. Normally, these loose contacts are very difficult to detect, they will be microscopic in dimension.  It is a good practice, that suck out the solder on all solder terminals of this IC and resolder it with fresh solder.  This must solve the problem.  Failure of this IC is very rare.  Check this power supply rail too.  It is powered at its pin number (2) and (4). The voltage applied is [+13VDC] at pin number 2 and [-13VDC] at pin number 4.  These voltages are generated and supplied from Line Output transformer pins (7) & (9) respectively.