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 !

Thursday, 19 March 2020

REPAIR / SERVICING TV HAIER LE40B7000C

Technical description and composition of the HAIER LE40B7000C TV, type of panel and applicable modules. The composition of the modules.
Haier LED
Model: LE40B7000C
Chassis / Version: SIS231.PT71
Panel: V390HJ1-PE1
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
MainBoard: TP.SIS231.PT71
IC MainBoard: CPU: SIS231, SPI Flash 25Q64
Appearance
HAIER LE40B7000C
General repair guidelines for TV LCD LED
Possible malfunctions
- Haier LE40B7000C TV does not turn on. The control lights on the front panel do not light or flash. On the remote control and other control buttons does not respond.
In most of these cases, the power source is faulty, all of its elements are located on the MainBoard TP.SIS231.PT71 main board. It is necessary to verify the presence of secondary supply voltages and, if they are absent, check the power switches and rectifier diodes for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse 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 be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. 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 TP.SIS231.PT71 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU: SIS231, SPI Flash 25Q64. Defective components should be replaced.

Once again, remind users! Attempts to self-repair a Haier LE40B7000C TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
 FIRMWARE FOR  SPI FLASH --------------------->    Haier LE40B7000C, Main: TP.SIS231.PT71, Panel: V390HJ1-PE1

 The appearance of MainBoard TP.SIS231.PT71 is shown in the figure below:
TP.SIS231.PT71
TP.SIS231.PT71 can be used in TVs:
Haier LE40B7000C (Panel V390HJ1-PE1), HAIER LE39B7000C (Panel T390XVN01.0 ), SUPRA STV-LC32T500WL (Panel LC320TU3A), SUPRA STV-LC40T900WL (Panel 720p HD 1366x768).
Key Features of HAIER LE40B7000C:
Installed matrix (LED-panel) V390HJ1-PE1.
To power the backlight LEDs, a converter is used, combined with the main board TP.SIS231.PT71.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is a TP.SIS231.PT71 module, using CPU chips: SIS231, SPI Flash 25Q64 and others.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V390HJ1-PE1
Type: a-Si TFT-LCD, CELL
Diagonal size: 39 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 853.92x480.33 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.8% (with Polarizer)
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit)
Response Time: 9.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 05:40
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