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 !

Sunday 3 May 2020

REPAIR / SERVICING TV IZUMI TL19H615B

Technical description and composition of the IZUMI TL19H615B TV, type of panel and applicable modules. The composition of the modules.
Izumi
Model: TL19H615B
Chassis / Version: B.TD604C
Panel: SVA190WX02TB
Inverter (backlight): integrated into PSU
PWM Inverter: TL494C
Power Supply (PSU): SH17LP601A
PWM Power: LD7575PS
MainBoard: B.TD604C
IC MainBoard: CPU: TD A15021H / N1C00, EEPROM / FLASH: 416B2GLI, 24C16
Tuner: TDQ-6F6 / T126CW
Technical Specifications TL19H615B
IZUMI TL19H615B
General recommendations for repairing TV LCD
It is recommended that you start troubleshooting with IZUMI using the B.TD604C chassis and other electronic devices with an external inspection of the external and internal elements. In some cases, visible external damage to the elements can indicate the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of electronic circuit nodes. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Malfunctions of the SH17LP601A power module can be expressed in different ways, for example, the IZUMI TL19H615B does not turn on at all and the control lights on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the IZUMI TL19H615B TV does not have an image, but there is sound, the malfunction should be sought in the backlight lamp 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 overstated ESR. All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU: TD A15021H / N1C00, EEPROM / FLASH: 416B2GLI, 24C16. Defective components should be replaced.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
FIRMWARE FOR SPI FLASH  ----------->   IZUMI TL19H615B, Main: B.TD604C, Panel: SVA190WX02TB

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    SH17LP601A Power supply


 The appearance of the MainBoard B.TD604C is shown in the figure below:
B.TD604C
B.TD604C can be used in TVs:
AKAI LTA-22E307 (Panel M220Z1-L05 Rev.C1), IZUMI TL22H615B (Panel M220Z1-L03 Rev.C1), IZUMI TL19H615B (Panel SVA190WX02TB), IZUMI TL22H614B (Panel M220Z1-L03).
The appearance of the power supply
Main features of the IZUMI TL19H615B device:
Installed matrix (LCD panel) SVA190WX02TB.
To power the backlight, a converter is used, combined with a power supply, controlled by a TL494C PWM controller.
The necessary supply voltages for all nodes of the IZUMI TL19H615B TV are generated by the SH17LP601A power module or its analogs using LD7575PS microcircuits.
MainBoard - the main board (motherboard) is a B.TD604C module using CPU chips: TD A15021H / N1C00, EEPROM / FLASH: 416B2GLI, 24C16 and others.
The TDQ-6F6 / T126CW tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SVA-NEC
Model: SVA190WX02TB
Type: a-Si TFT-LCD, Panel
Diagonal size: 19.0 inch
Resolution: 1440x900, WXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 408.24x255.15 mm
Brightness: 300 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 06:04
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