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 !

Saturday 30 March 2019

HOW TO DO A HARD RESET – FAULTS AND REMEDIES - PANASONIC PLASMA TVS

HOW TO DO A HARD RESET – FAULTS AND REMEDIES - PANASONIC PLASMA TVs

TH65PZ850U, TH58PZ850U, TH50PZ850U, TH46PZ850U, TH58PZ800U, TH50PZ800U, TH46PZ800U, TH42PZ800U, TH50PZ80U, TH46PZ80U, TH42PZ80U, TH50PX80U, TH42PX80U, TH50PZ85U, TH46PZ85U, TH42PZ85U.
How to perform a hard reset to Panasonic Plasma TV
 Normally; a hard reset can be done by unplugging the TV from AC mains wall socket, and re-plug it back after some minutes or hours.
 To   perform HARD RESET of Plasma TV unit by pressing & holding VOL DOWN (-) on unit and MENU button on remote at the same time for about 3 seconds.  This must be done if you replace the main board of the TV.  All new A boards supplied from factory needs to be initialized.  
 After the main board replacement. once AC power cord is plugged in, unit will turn on by itself. Depends on factory settings, unit will either display Video, Component or Tuner icon. After few seconds, screen will change to service mode automatically.  NOTE: Since unit is in service mode, only buttons 1, 2, 3 or 4 on remote are working (rest of buttons are nonfunctional).  After hard reset, confirm if Plasma TV powers ON in user mode and check overall functionality.
FAULTS TO 46" PLASMA TVs
* The unit shuts down and power LED blinks 10 times.
> Shorted Q409 & open PR401.  Replace Q409 & PR401
Speaker box is making rattling sound;  contact with cabinet parts
* Vibration noise from left or right speaker.  Speaker box is making direct contact with cabinet parts.
> Installing mounting screw in the center of speaker box prevents from touching the cabinet parts and minimizes the risk of vibration noise.  Install screw, part number THEL049 to both speaker boxes as shown here.  Repeat the same for left speaker box.
Relay clicks then TV shuts down with power LED 10 blinks
* When AC cord plugged in, relay clicks then TV shuts down with power LED 10 blinks.
> No Vin supply to IC520 (power control IC) due to open R712 & shorted C527.
Replace R712 & C527
R712: ERJ6GEYJ4R7
C527: ECJ3YB1E475K
Picture disappears after a few minutes, but sound is OK.
* Low Ldo_5V supply to IC9800 (DC to DC Converter) due to leaky D9801.  
> Replace D9801 on the D board.
D9801:  B0JCDD000002
Shuts down with power LED 10 blinks.
* Missing 395Vdc output due to shorted Q412 & Q413 and open PR401.
> Replace Q412, Q413, PR401 & check/replace Q408 and Q409.  Note: Always confirm condition of Q408 & Q409, in some cases could be shorted.
Q412 & Q413: B1DEGQ000070
Q408 & Q409:  B1DHCD000034
PR401: K5Y502BA0001
Posted By: FRANK at 03:15
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