REPAIRING AND NOT THROWING AWAY

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.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Thursday, 28 February 2019

LED BLINKING CODES - OR ERROR CODES - SONY WEGA TRINITRON - HA - SERIES COLOR TVS

LED BLINKING CODES - or Error Codes - SONY WEGA TRINITRON - HA - SERIES Color TVs


No picture, No sound. Standby LED blinks six times or stays lit without any blink.
Suspected parts
[1] LOT [Line Output Transformer] [NX 4751 M34A]
[2] Horizontal out transistor [2SD 2624-CA]
[3] ABL [Automatic Brightness Limiter] resistors (R511, R512, R568).
      All part numbers will be printed on both sides of the printed circuit board.  Check ABL control resistors (R511,R512,R568, R513 & R510) for open.  If any one among them did fail, the main system control IC will sense it as an over voltage, and will give you indication as six blinks of standby LED.  Don’t misunderstood it to be an over voltage indication. Check components attached to pin number ‘2’ of LOT, before replacing it.
LOT fault detection
If 135VDC drops as set is switched ON
     Desolder out the horizontal output transistor [Q801 – 2SD2624-CA], and switch ON the set without it. Now check whether the voltage drops or not.  If not, replace the transistor with a new one, and switch ON the set for a short period of time, say 3 to 5 seconds.  Switch it OFF, unplug the set from AC mains, and feel the heat of the replaced transistor.  If it overheats within this short period of time, make sure that LOT is defective.
     If the voltage drops without connecting the horizontal output transistor, check [C807-330PF, C808-0082PF, C814-12KPF & C812-0.033Uf (yoke return capacitor), for any leak or other defects.  Check C811-1Uf 250V too.  Replace it with a new one.  If any of the low value capacitors indicated above gets opened, horizontal output transistor will get shorted as soon as we switch ON the set.  This is a common fault and should be checked well, if horizontal output transistor found shorted [Collector to Emitter leak]
   Before replacing the horizontal output transistor with a new one, check these capacitors, and replace them if suspected.  It is a best practice to replace these capacitors, along-with horizontal output transistors.  Check all the solder terminals at horizontal output stage circuit, for any loose or dry soldering.  Re-solder all the suspected solder terminals, by applying a little more solder, without making any solder bridge short between adjacent solder terminals.
Posted By: FRANK at 02:38
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