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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Friday 21 August 2020

REPAIRING / SERVICING TV ROLSEN RL-19A09105

Technical description and composition of the ROLSEN RL-19A09105 TV, panel type and modules used. The composition of the modules.
ROLSEN
Model: RL-19A09105
Chassis / Version: RSAG7.820.1701
Panel: HT185WX1-100
Lamp backlight: 2 LAMP CCFL
Inverter (backlight): integrated into PSU
PWM Inverter: KA7500C
MOSFET Inverter: AO4616
Power Supply (PSU): HLP-12B11
PWM Power: SG6859ADZ
MOSFET Power: FQPF3N80C
MainBoard: RSAG7.820.1701 / ROH VER.C
IC MainBoard: SPI Flash: 25L1605DM, EEPROM: 24C04, 24C64
Tuner: TDQ-6FT / W126H / ROH
Specifications RL-19A09105
ROLSEN RL-19A09105
General recommendations for TV LCD repair
Possible manifestations of defects
- The ROLSEN RL-19A09105 TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
With similar manifestations, a malfunction is most likely found in the power module. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches (FQPF3N80C) and rectifier diodes for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) SG6859ADZ are usually checked by replacing them with new ones, or knowingly working.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
The defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of the lamps or the inverter.If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the RSAG7.820.1701 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - SPI Flash: 25L1605DM, EEPROM: 24C04 with new or known working ones. In cases where BGA technologies are used, defects are usually localized by heating.
Before changing the TDQ-6FT / W126H / ROH tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Users and owners of TVs should remember that attempts to self-repair the ROLSEN RL-19A09105 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->  EEPROM ROLSEN RL-19A09105, Main: RSAG7.820.1701 /ROH VER.C, Panel: HT185WX1-100


 The appearance of the MainBoard RSAG7.820.1701 is shown in the figure below:
RSAG7.820.1701
External view of the power supply
The main features of the ROLSEN RL-19A09105 device:
Installed matrix (LCD panel) HT185WX1-100.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by a KA7500C PWM controller. The keys of the AO4616 type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-19A09105 TV is carried out by the HLP-12B11 power module, or its analogs using SG6859ADZ microcircuits and FQPF3N80C power switches.
MainBoard - the main board (motherboard) is an RSAG7.820.1701 module, using SPI Flash chips: 25L1605DM, EEPROM: 24C04, 24C64 and others.
The TDQ-6FT / W126H / ROH tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HT185WX1-100
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
ROLSEN RL-19A09105 TV with LCD HT185WX1-100, 19 "(48 cm) 16: 9. Brightness of the screen 300 cd / m² provided by CCFL (EEFL) fluorescent lamps. Contrast as the ratio of maximum brightness to the minimum is 1000: 1. It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready) .Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation comes in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Stereo sound is realized by two built-in speakers. The audio processing system NICAM STEREO is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, component, SCART, VGA, HDMI, USB. 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.
The power consumed by the TV in operating mode from the network is 40 watts.
Dimensions: with stand 468x355x168 mm, without stand 468x315x72 mm.
TV weight: 6 kg.
Attention! ROLSEN RL-19A09105 LCD TV panel HT185WX1-100 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 05:04
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