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, 16 February 2019

MITSUBISHI LT3280D LT3780D TROUBLESHOOTING LED BLINKINGS

MITSUBISHI LT3280D LT3780D Troubleshooting LED blinkings

Connect the Power Plug and turn ON the main Power switch [front switch or remote switch].


Is Power LED lighting or blinking?
No
Is the power plug connected to the wall outlet correctly?
No
Connect the power plug correctly.



Yes
Is all harness on board is connected correctly?
No
Connect all harness correctly.



Yes
Is 24V output available at the lead of L9B1?
No
PCBA-Power is out of order.



Yes
Is S3.3V output available at the cathode of D9G8?
No
Is F9G4 broken?
No
IC9B1 or peripheral circuit is out of order.





Yes
PD harness is removed after F9G4 is repaired.  Connect the power plug again.  Is the S3.3V output available at the cathode of D9G8?





Yes
Pcba-Main is out of order

No
Is the AC_Off output available at 10 pin of PE?
No
PC9A4 or peripheral circuit is out of order.





Yes
IC700 or peripheal circuit is out of order. [Pcba-main]
















In case of the Power LED blinking 1 time within a cycle

CN-1 & CN-2 harness are removed.  Connect the Power Plug again and turn ON the Main Power Switch.  Is Power LED blinking?
No
The inverter circuit of the LCD-Panel is out of order.





Yes
Pcba-Power-Sub1 is out of order (only LT-3780D)
Pcba-Power-Sub 2 is out of order. (only LT-3280D)




Power LED blinks 2 times

Confirm the following fuses.




F9G1
1.6A
AMPVCC[1V]
Cathode of D9H5

F9G6
1A
P5V (Only 32”)
Cathode of D9J9

F9G7
4A
18V (Only 37”)
Cathode of D9J2

F9G8
0.5A
4.5V
Cathode of D9H5

Is the voltage of 4.5V, AMOVCC[17V], P5V (Only 3280D) and 18V (Only 3780D) output available?
Yes
PD and PE harness are connected after the power plug is removed.  Is the voltaic of 4.5V and 18V output available?
Yes
The circuit of LCD panel is out of order



No
Pcba-Main is out of order.
Posted By: FRANK at 06:16
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