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!

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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

SAMSUNG CS21M16MJZXNWT CRT TV – HOW TO ENTER THE SERVICE MODE, CIRCUIT DIAGRAM

Samsung CS21M16MJZXNWT CRT TV – how to enter the service mode, circuit diagram

High Voltage Limits
High voltage must be measured each time servicing is done on the B+, horizontal deflection or high voltage circuits. Correct operation of the X-ray protection circuits must be reconfirmed whenever they are serviced.
(X-ray protection circuits also may be called “horizontal disable” or “hold-down”.)
Proceed the high voltage limits. These include the X–ray Protection Specifications Label, and the Product Safety and X-ray Warning Note on the service data schematic.
[The CRT is charged with high voltage.  Before removing the Anode Cap, discharge the voltage through one of the heat sinks on the main board.]
Power, CRT, Vertical and Horizontal section schematic
Onechip and MICOM
Sound and External AV
Factory Mode
1. Do not attempt these adjustments in the Video Mode.
2. The Factory Mode adjustments are necessary when either the EEPROM (IC902) or the CRT is replaced.
3. Do not tamper with the “Adjustment” screen of the Factory Mode menu. This screen is intended only for factory use.
When EEPROM (IC902) Is Replaced
1. When IC902 is replaced all adjustment data revert to initial values. It is necessary to re-program this data.
2. After IC902 is replaced, warm up the TV for 10 seconds.
Factory/Service Mode (This mode uses the standard remote control.)
1.The Service Mode is activated by entering the following remote-control sequence:
(1) DISPLAY=>FACTORY.
(2) STAND-BY=> DISPLAY=> MENU=> MUTE =>POWER ON.
2. The “SERVICE (FACTORY)” message will be displayed. The Service Mode has three components: ADJUST, OPTION,OPTION1,G2 Adjust and Reset.
3. Access the Adjustment Mode by pressing the “VOLUME” keys ( Up or Down). and selected by pressing the CHANNEL keys (▲ ,▼).
4. Selection sequences for the all system:
DOWN or UP key
AGC>SCT>SBT>BLR>BLB>RG>GG>BG> VSL>VS>VA>HS>SC>CDL>STT>AKB> PDL>NDL>PSR>NSR>VOL>LCO>TXP> FMVOL>FMWS>AGCS>OMD>SCL>PWL> AGN>PEK>ACL>FCO>SCBT>SSP>PSNS
5. The VOLUME keys increase or decrease the adjustment values (stored in the non-volatile memory) when Adjustment Mode is cancelled.
6. Cancel the Adjustment Mode by re-pressing the “FACTORY” or “Power OFF” keys.
Cathode voltage adjustment 9Screen voltage)
Input a gray scale pattern.
( Use a pattern generator,PM5518)
2. Enter "Adjustment" Mode:
3. Select "G2 adjust" by pressing channel key Up/Dn.
4. Enter "G2 adjust" by pressing channel key Left/Right
5. Adjust he screen Vr (On the FBT),so that OSD becomes "SCREEN ADJEST:OK"
Posted By: FRANK at 04:08
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