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 !

Wednesday 6 February 2019

DELL 1800FP - LD803H LG CL29-CHASSIS – 18 INCH LCD MONITOR – SCHEMATIC DIAGRAM


Dell1800FP - LD803H LG CL29-Chassis – 18 inch LCD monitor – Schematic Diagram
 

Dell1800FP -  LD803H LG CL29-Chassis - 18 inch LCD monitor -  Power supply regulator (SMPS) -  Circuit Diagram - Main board - Adjustments
Type: TFT SXGA LCD
Size: 18.1inch
Pixel Pitch: 0.2805(H) x 0.2805(V)
Color Depth : 8-bit, 16,777,216 colors
Backlight Unit: 6-CCFL (Cold Cathode Fluorescent Lamp)
AC Input: AC 100~240V, 50/60Hz, 1.0A (Built-in Power)
Operating Frequency
Horizontal: 30 ~ 80 kHz
Vertical: 56 ~ 85Hz
DELL 1800FP Driver Board LD803H 6870T494A12
Micom and LVDS schematics
Memory and Power (SMPS) circuits
Power Part.
This part consists of the one 5V, two 3.3V and one 2.5 regulators to convert power which is provided 12V, 5V in Power Board.
12V is provided for inverter, 5V is provided for Micom and LCD Panel.  Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.
Inverter
The inverter converts from DC12V to AC 700V and operate back-light lamp of module.
Adjustment Start
1) Display any pattern at any Mode.
2) Run alignment program for LD803H on the IBM compatible PC.
3) Select EEPROM → ALL INIT command and Enter.
4) This will make all data to default state.
5) Select COMMAND → PRESET START command and Enter.
Adjustment for White Balance
1) Display Black pattern at SXGA/60Hz.
2) Set External Bright to MAX position and Contrast to MAX Position.
3) Select PRESET START → BIAS CAL command and Enter.
4) No attempt to manually adjust, BIAS data is automatically adjusted and saved to the EEPROM.
5) Display Full White pattern at SXGA/60Hz.
6) Select DRIVE CAL command and Enter.
7) 9300K are automatically adjusted and saved to the EEPROM.
8) Select PRESET EXIT command and Enter.
Adjustment for EDID
1) Use this procedure only when there is some probelm on EDID data.
2) Connect the D-sub cable.
3) Select EEPROM → EDID(A) WR command and Enter.
4) DVI to D-sub cable.
5) Select EEPROM → EDID(D) WR command and Enter.
Exploded view
Posted By: FRANK at 07:44
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