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

Friday 8 February 2019

SONY WEGA - KV27FV15 / KV32FV15 / KV36FV15 / KV32FS10 / KV36FS10 / KV32XBR250 / KV36XBR250 _ POWER SUPPLY FAILURE - SYMPTOMS

SONY WEGA - KV27FV15 / KV32FV15 / KV36FV15 / KV32FS10 / KV36FS10 / KV32XBR250 / KV36XBR250 _ POWER SUPPLY FAILURE - SYMPTOMS






     The table below describes various symptoms that can occur if there is a short on any of the power supply lines. These types of problems occur when major components being supplied fail by shorting. An example would be if the audio amp were to fail the set might shut down as if the Audio B+ line were shorted.

     Many times observing all the symptoms can lead you towards the correct failed component or problem. All of your senses should be used when troubleshooting. What you see, hear and smell can often lead you to quick fix.
Power supply voltages & distribution
Shorted Supply
Distribution
+135
A Board - T503 Flyback, H Drive Q501, H Out Q502, Pin Amp Q512, WA board VM Drive Q946.
+12
A Board - Q301 HP Buffer, IC353 SHP, All WA board except VM Drive.
+9
A board - TU102 Tuner, IC351 VM Mute, IC352 YUV Switch, IC354 YUV Switch, IC355 Y/C Jungle, IC101 D/A
Converter, AK Board - IC1401 Audio Processor, IC1403 SRS, Q1102 Tuner 5 Volt Regulator, C Board - Q1790 IK
Buffer, UY Board - IC2006 5 Volt Regulator, IC3302 5 Volt Regulator, IC3304 Chroma Decoder, IC3308 YUV Switch,
UY Board IC2005 3.3 Volt Regulator, IC2006 5 Volt Regulator for tuners.
UY5 from IC2006
IC3504 Comb Filter.
UY5 from IC3302
IC3307 V Chip, IC3303 PIP Processor.
Audio B+ (33
Volts.
AK Board - IC1461 Audio Output.

Voltage
Relay clicks
Video
Audio
Timer LED
HV
Power Switch Off
Suspect
+135
2 clicks very close
together Power Only
None
None
Blinking
None
No relay click but
Timer LED stops
Blinking.
Q502 H Out, T503
Flyback, Q512 Pin
Out.
+12
1 click. Power relay
only.
IK lines visible.
OSD expanded
almost off screen.
OK
Normal
OK
Unit shuts off
Normally.
WA board problem
or Q301 or IC353 on
A Board.
+9
2 clicks Power Relay
and Degauss relay.
Degauss relay never
turns OFF.
None
None
Blinking
None
Both relays turn
OFF and Timer LED
stops blinking.
Regulators on A
Board.
B+Audio
Normal
Normal
None
Normal
Normal
Normal
PS1461 AK Board
+200
2 clicks very close
together Power Only.
None
None
Blinking
None
No relay click but
Timer LED stops
Blinking.
IC1761 CRT Amp.
Disconnect CN1764
to verify.
+12
3 clicks. 2 Normal but then an extra click
indicating shutdown.
None
None
Blinking
None
No clicks
IC561:  Vertical Output. Check R537.
- 15
2 clicks. Power and
Degauss.
None
None
Blinking
Starts to   come
up but stops
after 2nd click.
2 clicks when set is turned OFF.
IC561 Vertical Output. Check
R536
Converter
not
switching
1 click. Power Relay
only.

None
None
Blinking
None
1 click. Power Relay
only.
IC601 and/or R607
Posted
Posted By: FRANK at 06:13
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