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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Thursday 20 August 2020

REPAIRING / SERVICING TV ROLSEN RL-20X30

Technical description and composition of the ROLSEN RL-20X30 TV, panel type and modules used. The composition of the modules.
ROLSEN
Model: RL-20X30
Chassis / Version: PLVM01
Panel: LC201V02 (SD) (B1)
Lamp backlight: 6 Lamp CCFL
Inverter (backlight): AT-6201LG12 (BIT) Rev. C
PWM Inverter: FAN7311
MOSFET Inverter: P2803NVG (8) ZEP17000
Trans Inverter: KE-200BFCC0703
Power Supply (PSU): adapter 12v / 5a HASU12FB, FC-6000, + 12v = 6000ma
PWM Power: STK8050SD
MainBoard: PLVM01_DPPB10254S RHPB-10254F (RHMA-M0126C sticker)
IC MainBoard: VCT49XYI, A29040AL (DMT7-11-26 TV), MTL015GF, TDA7266D, TECH2949PG40B (D)
Tuner: TECH2940A (D)
Control: LC03-AR028A
RL-20X30 Specifications
ROLSEN RL-20X30
General recommendations for TV LCD repair
Repair and diagnostics of any electronic device, in particular ROLSEN with PLVM01 RHPB-10254F chassis (RHMA-M0126C sticker), it is advisable to start with a careful external examination of the internal and external elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before starting the necessary measurements. If charred resistors, swollen electrolytic or sintered capacitors, ring cracks in the soldering of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction, as well as to check the connected elements and assemblies.
Malfunctions of the adapter 12v / 5a HASU12FB, FC-6000, + 12v = 6000ma power supply module can be expressed in different ways, for example, ROLSEN RL-20X30 does not turn on at all and the control lamps on its front panel do not light up or blink, all signs of operability are missing. It should be noted that the processor power regulator (converter) may be faulty with the same external manifestations. When repairing a power supply, it is advisable to start diagnostics with checking the mains fuse and electrolytic capacitors of the filters of the secondary rectifiers of the converter. In the event of a break in the fuse, the cause should be sought in the power semiconductor elements of the pulse converter of the main power supply unit. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power switch (s) of the converter.
The reasons for the breakdown of the power switch in switching power supplies (SMPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the DC-DC 2576-33 PWM regulator microcircuit. STK8050SD. or breaks of resistors in its strapping.

If ROLSEN RL-20X30 has no image, but there is sound, there is a possibility of a malfunction of the backlight lamps or their power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are in good condition. It must be borne in mind that in the event of a disconnection of the inverter protection (for the purpose of diagnostics) there is a risk of failure of the power elements of the inverter and take special care. After carrying out repair work, the protection circuits must be restored for the further safe operation of the TV.
Repair or diagnostics of the motherboard DPPB10254S main PLVM01 // RHPB-10254F (Sticker RHMA-M0126C) should start with checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - VCT49XYI, A29040AL (DMT7-11-26 TV), MTL015GF, TDA7266D, TECH2949PG40B (D) which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (detected by warming up).
Attention to the owners! Attempts to repair the ROLSEN RL-20X30 TV on your own are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI EEPROM FLASH  ----------->   ROLSEN RL-20X30, Main: PLVM01 DPPB10254S, Panel: LC201V02 (SD)(B1)
 
 The appearance of the MainBoard PLVM01_DPPB10254S is shown in the figure below:
PLVM01_DPPB10254S
The main features of the ROLSEN RL-20X30 device:
Installed matrix (LCD panel) LC201V02 (SD) (B1).
To power the backlight lamps, an AT-6201LG12 (BIT) inverter is used, controlled by the FAN7311 PWM controller. The transformer KE-200BFCC0703 is installed in the inverter converter. The keys of the P2803NVG (8) ZEP17000 type are used as power elements of the inverter.
To power all internal nodes of the ROLSEN RL-20X30 TV, an external source such as adapter 12v / 5a HASU12FB, FC-6000, + 12v = 6000ma is used using STK8050SD microcircuits.
MainBoard - the main board (motherboard) is a PLVM01_DPPB10254S module, using VCT49XYI, A29040AL (DMT7-11-26 TV), MTL015GF, TDA7266D, TECH2949PG40B (D) and others.
Tuner TECH2940A (D) provides reception of television programs and tuning to channels.
Information from an alternative source:
Rolsen RL-20X30 / Rolsen RL-20X31 (without DVD) Central board :, Model: PLVM01, Code No: RHPB-10254F (RHMA-M0126C sticker), Board composition: VCT49XYI, A29040AL (DMT7-11-26 TV), MTL015GF , TDA7266D, TECH2949PG40B (D), Matrix - LC201V02 (SD) (B1), Inverter - AT-6201LG12 (BIT) Rev.C: FAN7311 \ G52, P2803NVG \ ZEP17000, Transformers 6pcs. - KE-200B \ FCC0703, External power supply - Model - FC-6000, + 12v = 6000ma, Remote control - LC03-AR028A
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V.


TV ROLSEN RL-20X30 with LCD display LC201V02, diagonal size 20 "4: 3. The brightness of the screen is 450 cd / m2 provided by backlighting CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 800: 1 .Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in 480i, 480p, 576i, 576p standards. Supported multimedia file formats: MP3, WMA, MPEG4, VideoCD, SVCD, Picture CD, JPEG.
Speaker power 6 W (2x3 W) is provided by two speakers. The NICAM STEREO audio processing system is used.

External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, SCART, RGB, VGA. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.

Dimensions: with stand 510x479x240 mm, without stand 510x433x88 mm.
TV weight: 9 kg.


Attention! ROLSEN RL-20X30 LCD TV panel LC201V02 (SD) (B1) is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!

Posted By: FRANK at 07:02
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