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-32D40

Technical description and composition of the ROLSEN RL-32D40 TV, panel type and modules used. The composition of the modules.
ROLSEN
Model: RL-32D40 RL-32D40D
Chassis / Version: LQ32-1H25RS6K
Panel: LC320W01 (SL) (01)
Inverter (backlight): KSL-EE32CI-M REV09 + S 6632L-0211A
PWM Inverter: OZ9981GN (16),
MOSFET Inverter: RSS100 N03 (8)
Trans Inverter: IT-092 0763
Power Supply (PSU): RHSM-S1007E
PWM Power: L6598 (PWM), L6562D (PFC), VIPer22A (Standby) + Trans DM-2218A2
MOSFET Power: 11NM60, 20NM60 (PFC)
MainBoard: RHMA-M00701
Tuner: TECH2949PG40B (D)
RL-32D40D Specifications
ROLSEN RL-32D40
General recommendations for TV LCD repair
Repair and diagnostics of any electronic device, in particular ROLSEN with LQ32-1H25RS6K chassis, it is advisable to begin with a careful external examination of the internal and external elements. Based on visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before taking the necessary measurements. Elements with visible damage, for example, capacitors swollen after electrolyte boiling, charred resistors in certain nodes of the circuit, as well as ring cracks in the solders, will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the ROLSEN RL-32D40 TV simply does not turn on. No control lamps on the front panel are on or blinking, the TV does not respond to the remote control and does not emit any sounds or any signs of life when turned on. The most probable cause of the malfunction is the failure of the RHSM-S1007E common power supply module. If it works, check the processor batteries on the SSB (Main Board). When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the secondary rectifier filter and check the fuse and, if it is broken, the cause must be identified. Often in such cases an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes and transistors in the primary circuit.
Mos-Fet switches used in switching power supplies (SMPS) rarely fail without reasons that must be looked for by checking other circuit elements. Breakdown is often caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or breakdown of resistors in stabilization circuits. The PWM controller microcircuit can also cause the breakdown of the power switch of the converter.
If the ROLSEN RL-32D40 TV does not have a picture, but there is sound, the malfunction should be looked for in the backlight power converter (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overestimated ESR. When diagnosing a malfunction of an inverter with disabled protection, special care must be taken, because there is a risk of failure of the power elements of the inverter. After diagnostics, it is imperative to restore the protection circuits for the inverter to operate in normal mode.
The RHMA-M00701 motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software.
Remember! Attempts to repair the ROLSEN RL-32D40 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!

 SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Rolsen RL-32D40D, RL-32D50D, RL-32D60D


 Additionally by PSU:
The RL-32D40 model uses an RHSM-S1007E power supply unit with a PFC (Power Factor Correction) node - an active harmonic filter of the consumed current. In fact, this is a step-up converter based on the L6562D PWM regulator, which excludes the charging current of the electrolytic capacitor of the mains rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.

As a result of the converter operation, the envelope of high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The serviceability of the PFC unit can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the network rectifier in operating mode.
External view of the power supply
The main features of the ROLSEN RL-32D40 device:
Installed matrix (LCD panel) LC320W01 (SL) (01).
The KSL-EE32CI-M inverter is used to power the backlight lamps, it is controlled by the OZ9981GN PWM controller (16),. The transformer IT-092 0763 is installed in the inverter converter. The switches of the RSS100 N03 type (8) are used as the power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-32D40 TV is carried out by the RHSM-S1007E power module, or its analogs using the L6598 (PWM), L6562D (PFC), VIPer22A (Standby) + Trans DM-2218A2 power switches and 11NM60 type power switches, 20NM60 (PFC).
MainBoard - the main board (motherboard) is an RHMA-M00701 module.
Tuner TECH2949PG40B (D) provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-SL01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 73%
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
ROLSEN RL-32D40D TV with LCD display LTA320W2-L14, 32 "(81 cm) 16: 9 format diagonal. Screen brightness of 500 cd / m² backlit by CCFL (EEFL) fluorescent lamps. Contrast as a ratio of maximum brightness to the minimum is 800: 1. It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard for 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 takes place in 480i, 480p, 576i, 576p, 720p, 1080i standards Supported media file formats: MP3, MPEG4, VideoCD, SVCD, Picture CD, JPEG Stereo sound is realized by two built-in speakers NICAM stereo signal processing system and Sound Surround function are used ...
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, S-Video, component, SCART x2, VGA, DVI HDCP. 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, 1360x768.
Dimensions: with stand 820x660x310 mm, without stand 820x600x120 mm.
TV weight: 26 kg.
Attention! The LTA320W2-L14 panel of the ROLSEN RL-32D40D LCD TV 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 05:00
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