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 !

Monday 11 March 2019

HITACHI 32LD380TA SERVICE MODE AND POWER SUPPLY BLOCK DIAGRAM

HITACHI 32LD380TA SERVICE MODE

AND POWER SUPPLY BLOCK DIAGRAM

 SERVICE MODE 

This unit is provided with the following SERVICE MODES so you can repair, examine and adjust easily.
SERVICE MODE
To enter to the SERVICE MODE function, press and hold both buttons simultaneously on the main unit and on the remote
control for more than the standard time in the appropriate condition
WHEN REPLACING EEPROM (MEMORY) IC
CONFIRMATION OF CHECK SUM, POWER ON TOTAL HOURS AND MICON VERSION
Initial total of MEMORY IC, POWER ON total hours and MICON VERSION can be checked on the screen. Total hours are displayed in 16 system of notation.

WHEN REPLACING EEPROM (MEMORY) IC
NOTE:If you set a factory initialization, the total hours is reset to "0". Please refer to "CONFIRMATION OF INITIAL DATA" when SUM DATA is not corresponding.
1.Turn on the POWER, and set to the TV mode.
2.Set the VOLUME to minimum.
3.Press both VOL. DOWN button on the set and Channel button (8) on the remote control for more than 2 seconds.
4.After the confirmation of each check sum, turn off the power.
 ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
Use an isolation transformer when performing any service on this chassis.
When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position.
When you exchange IC and Transistor with a heat sink, apply silicon grease (YG6260M) on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damage to the IC and Transistor).
Prepare the following measurement tools for electrical adjustments.
1. Pattern Generator
BASIC ADJUSTMENTS
On-Screen Display Adjustment
1. Set the VOLUME to minimum.
2. Press the VOL. DOWN button on the set and the channel button (9) on the remote control for more than 2 seconds to display adjustment mode .
3. Use the Channel UP/DOWN button or Channel button (0-9) on the remote control.
4. Press the MENU button on the remote control to end the adjustments.
5.To display the adjustment screen for AV, HDMI and COMPONENT mode, press the INPUT SELECT button on the remote control to set to the AV, HDMI and COMPONENT mode. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 2 seconds.
 CONTRAST
1. Receive the monoscope pattern.(RF Input) Activate the adjustment mode display and
2. press the channel button (35) on the remote control to select "CONTRAST CENTER".
3. Check if the step No. CONTRAST CENTER is "147".
4.Receive a broadcast and check if the picture is normal.
5.Press the INPUT SELECT button on the remote control to set to the AV mode.
6.Activate the adjustment mode display and press the channel button (35) on the remote control to select "CONTRAST CENTER".
7.Check if the step No. CONTRAST CENTER is "147".
8.Receive a broadcast and check if the picture is normal.
9.Receive a Color Bar Pattern.
10.Press the INPUT SELECT button on the remote control to set to the COMPONENT mode.
11.Activate the adjustment mode display and press the channel button (35) on the remote control to select "CONTRAST CENTER".
12.Check if the step No. CONTRAST CENTER is "147".
13.Receive a broadcast and check if the picture is normal.
14.Playback the DVD disc. (480i input)
15.Press the INPUT SELECT button on the remote control to set to the HDMI mode.
16.Activate the adjustment mode display and press the channel button (35) on the remote control to select "CONTRAST CENTER".
17.Check if the step No. CONTRAST CENTER is "147". Receive a broadcast and check if the picture is normal.

POWER SUPPLY BLOCK DIAGRAM 
CLICK ON THE IMAGE TO ZOOM IN
Posted By: FRANK at 13:27
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