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 !

Monday, 4 May 2020

REPAIR / SERVICING TV IZUMI TLE19H205B

Technical description and composition of the IZUMI TLE19H205B TV, type of panel and applicable modules. The composition of the modules.
IZUMI LED
Model: TLE19H205B
Chassis / Version: LA.MV9.N
Panel: V185BJ1-LE1 REV.B1
T-CON: V185BJ1-XCE1; FP6783, CM603, CM1801B, 25Q32BG, -NS4263
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: ME15N10
Power Supply (PSU): CTN1034-L V1.01L
PWM Power: 73E15 (PWM SOT23-6 OB2273)
MainBoard: LA.MV9.N (CV59L)
IC MainBoard: TSUMV59XU-Z1, GD25Q32
Technical Specifications TLE19H205B
IZUMI TLE19H205B
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The IZUMI TLE19H205B TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
In such cases, the CTN1034 power supply is usually faulty. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may also be PWM (PWM) 73E15 (PWM SOT23-6 OB2273). It is checked only by replacement with a known good one.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The most likely in these cases is a malfunction of the LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the LA.MV9.N motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - TSUMV59XU-Z1, GD25Q32. Defective components should be replaced.
Owners and users of the IZUMI TLE19H205B TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH  ----------->   IZUMI TLE19H205B, Main: LA.MV9.N (CV59L), Panel: V185BJ1-LE1 REV.B1 




 The appearance of MainBoard LA.MV9.N is shown in the figure below:
LA.MV9.N
The appearance of the power supply
Main features of the IZUMI TLE19H205B device:
Installed matrix (LED-panel) V185BJ1-LE1 REV.B1.
The matrix control uses the Timing Controller (T-CON) V185BJ1-XCE1 ;.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB3350CP PWM controller. As the power elements of the LED driver, keys of the type ME15N10 are used.
The necessary supply voltages for all nodes of the IZUMI TLE19H205B TV are generated by the CTN1034-L power module or its analogs using 73E15 microcircuits (PWM SOT23-6 OB2273).
MainBoard - the main board (motherboard) is a LA.MV9.N module, using TSUMV59XU-Z1, GD25Q32 and others.
Additional technical information about the panel:
Brand: INNOLUX
Model: V185BJ1-LE1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 9 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 01:57
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