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!

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Friday, 8 February 2019

SONY WEGA SERIES – KV-HA21M80/H - KV-HA21M81 - TRINITRON COLOR TVS

SONY WEGA SERIES – KV-HA21M80/H - KV-HA21M81 - Trinitron Color TVs

Sony WEGA Color TVs - KV-HA21M50 - KV-HA21M80 - KV-HA21M80/H - KV-HA21M81 - KV-HA21P52 - KV-HA14M80 & KV-HW21M83
Symptoms 
 Black screen with no sound or bright horizontal line across the screen, standby LED blinks four times, or  stay lit.

Total vertical sweep failure is the fault.

     Vertical oscillator or output section has the fault.  Check all the solder points at (IC551 – AN5522), for any loose solder.  Advised to resolder all the solder points of this IC (7 of them) by applying a little more solder to each solder terminals, without making any solder bridge short in between adjacent solder terminals.  In most cases, the fault will be of loose solder points to the terminals of this IC.  Check (R533 – 2.2 Ohms] for open. If resoldering these points does not help you check the input +ve voltage at pin number 2 of this IC. It should be around 13VDC (+13V vcc).  Check the voltage at pin number 4 of this IC.  It should be around – 13VDC (- 13V vss). 

     If (+13VDC) at pin number ‘2’ is absent, check [C501, C504, D503 & R508].  Voltage to this IC is derived from LOT pin number ‘9’.  Check all the soldering terminals at LOT for any loose.  If found, resolder them by applying a little more solder.  If (- 13DC at pin number ‘4’ is absent, check [C502, C503, Zener diode D502 and R507].  All these component numbers will be printed on either side of the printed circuit board, and are easy to detect.  If all these components are OK, and still there is no vertical output, check whether IC AN5512 heats up abnormally.  If it does, make sure that IC is faulty, and should be replaced. 
     In most cases this IC fount to be faulty, causing vertical sweep failure. When you replace this IC with a new one, zener diode (D502) should be replaced along with.
Just understand that, the voltages to this vertical output IC is generated by LOT, up to that stage is working fine.
     In this model Sony sets, this is a common fault found
Posted By: FRANK at 03:38
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