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 !

Thursday, 21 March 2019

LG 37LH55 - T-CON BOARD - REMOVAL [LCD CONTROLLER BOARD] - T'CON BOARD VOLTAGE CHART

LG 37LH55 - T-CON BOARD - REMOVAL [LCD CONTROLLER BOARD] - T'CON BOARD VOLTAGE CHART




LCD CONTROLLER BOARD [T'CON BOARD] (PART NUMBER - EAT60664401)
  • The T-Con IC UC1 receives from the Main Board LVDS at CN1 and CN2.  This is a duel 24 Bit LVDS Video Signal which it processes into TFT Drive Signals which are delivered through connectors CN4 and CN5 to the LCD TFT Panel.
  • 12V is supplied to the T-Con Board on connector CN1 from the Main Board easily measured at fuse F1, (3A and 125V).
There is a DC to DC converter that creates;
  • (16.3V Measured at VDD). (26.2V Measured at D5 cathode).
  • (3.3V Measured at VCC). (-7.47V Measured at D6 bottom left leg).
These Voltages can also be measured atthe ribbon connectors delivering signals to the TFT panel
  • (CN4 26.2V pin 8, -7.4V pin 11, 3.3V pins 53, 54 and 16.3V pins 56, 57).
  • (CN5 26.2V pin 7, -7.4V pin 6, 3.3V pins 53, 54 and 16.3V pins 56,57)
T'CON BOARD REMOVAL
  • Remove the 2 Screws in the T-CON shield.
  • Remember, these two screws have to be replaced in the board if the TV is to be run without the T-CON shield in place.
  • There are Chocolate (Heat Transfer) material pieces on the backside of the T-CON Heat sink. They dissipate heat from the UC1 and US3 ICs.  Be sure to return these pieces when Reinstalling the Heat Sink (Shield).
  • Remember to re-install the 2 screws for the Service Position ifthe T-CON board needs to be turned on for test purposes. These would have been removed when taking off the shield.
  • Disconnect CN1, CN2, CN4 and CN5.
UNLOCKING CN1, CN4 and CN5.
  • To remove the flex cables to the TFT Panel, CN4 or CN5: Place a soft thin object like a fingernail underneath the black locking tab and gently pull forward.
  • Flip the lock up and back from the flex cable.  Then the flex cable can be easily removed.
T-CON PWB CHECKS
T-CON PWB Connector CN1 to Main PWB Voltage and Diode Check.
  • Diode Check taken with meter in Diode Mode with all Connectors Removed.
  • Pin 8 PWM-DIM 3.15V (Max 100%) to 0.6V (Min 0%) Customer’s Menu back-light setting.
CN-1 CONNECTOR "T-CON" PWB to [P-800] "MAIN" PWB VOLTAGE AND DIODE CHECK

T-CON PWB Connector CN2 to the Main PWB (Voltage and Diode Check. 
CN2 “T-CON“ to P801 CONNECTOR "Main.
Posted By: FRANK at 03:28
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