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 !

Friday, 5 April 2019

HITACHI PLASMA TV - 42EDT41 - HORIZONTAL LINE FAULT - TROUBLESHOOT

HITACHI PLASMA TV - 42EDT41 - HORIZONTAL LINE FAULT - TROUBLESHOOT


SUSTAIN SHORT [Line ON]
Horizontal Sustain Influence for Z and Y SUS PWBs, Y Drive Upper and Y Drive Lower PWBs.
(Note: Defect Line shown is on the bottom, so the back X-Drive Left PWB would be involved or the Z-SUS output from the bottom connector).
Note: The Screen can be broken down into 8 Horizontal Rows. (See the Bottom PWB layout) from the Drive PWBs (4 from Upper Drive PWB and 4 from Lower Drive PWB) and 2 Rows from the Z-SUS PWB (Top and Bottom). Each of the connectors from the Control, X-Drive Left and Right PWBs controls each column. Try to determine which area of the screen is affected to determine the PWB involved.
SUS open (line off)
Horizontal Sustain Influence for Z and Y SUS PWBs, Y Drive Upper and Y Drive Lower PWBs.
(Note: Defect Line shown is on the bottom, so the back X-Drive Left PWB would be involved or the Z-SUS output from the bottom connector).
Note: The Screen can be broken down into 8 Horizontal Rows. (See the Bottom PWB layout) from the Drive PWBs (4 from Upper Drive PWB and 4 from Lower Drive PWB) and 2 Rows from the Z-SUS PWB (Top and Bottom). Each of the connectors from the Control, X-Drive Left and Right PWBs controls each column. Try to determine which area of the screen is affected to determine the PWB involved.
X DRIVE LEFT AND RIGHT PWB INFORMATION:
Each X Drive PWB Receives LOGIC signals from CONTROL PWB and makes ADDRESS PULSE (generates Address discharge) by ON/OFF operation, and supplies this waveform to COF (data) "Chip On Film".
CONTROL PWB:
This picture shows the Control PWB and it’s 3 connectionsat the bottom to the COF connectors. Creates signal processing (Contour noise, reduction ISM,..) by an order of many FETs turning on/off for each DRIVER. Controls R, G, B (each 8 bit outputs, then parallel split).   Uses 3.3V / 5V (2 kinds of power regulators on board ).
CONTROL PWB:
This is a blow up of the Left side of the Control PWB showing the 3.3V and 2.5V Regulators.
Posted By: FRANK at 02:06
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