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 26 March 2020

REPAIR / SERVICING TV TOSHIBA 15DV703R

Technical description and composition of the TOSHIBA 15DV703R TV, type of panel and applicable modules. The composition of the modules.
Toshiba
Model: 15DV703R 15DV704R
Chassis / Version: GRU2 WISTRON
Panel: M156B1-L02 RevC1 79104859
Inverter (backlight): LIPS 560450201008002E6VD00 DELTA 75019661
PWM Inverter: OZ9938GN (16)
MOSFET Inverter: 4511GH (5)
Trans Inverter: IH-DP9040 (01) DCUM1005 (03) I3
Power Supply (PSU): DPS-50UP-1A LIPS 560 450 150 1008002E6VD00 75019661
PWM Power: 6742MR (8)
MOSFET Power: K4101
MainBoard: GRU2 15 19 22 75019667 09182-2 48.71Y01.021
IC MainBoard: DAV-RR953WR, TDA7491P, 75019668 DVD-RW DRIVE UNIT, HH SLOT, DAV-RR953WR, RUSS SOH-DL6 (SAMSUNG IM)
Tuner: TDTC-G429D
Control: SE-R0319
Specifications 15DV703
TOSHIBA 15DV703R
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the TOSHIBA 15DV703R, 15DV704R TV with a careful external examination of the internal and external elements, including case parts, display, buttons and cables. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the TOSHIBA 15DV703R, 15DV704R does not turn on, no control lights on the front panel light up and do not blink, therefore, there is a very high probability of a malfunction of the DPS-50UP-1A LIPS 560450201008002E6VD00 75019661 power supply module. If the mains fuse is broken, in most cases it is detected breakdown of the power switch K4101, which can be integrated with a PWM controller, or a separate field effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
As a rule, the keys of flyback converters, which use the N-Fet field effect transistor on a separate radiator, or integrated with the TA1AD 6742MR (8) PWM controller in a single chip, are quite reliable and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the TOSHIBA 15DV703R, 15DV704R does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
In most cases, the diagnosis and repair of the LIPS 560450201008002E6VD00 DELTA 75019661 inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or open circuits in high voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
If the motherboard 75019667 09182-2 48.71Y01.021 GRU215 19 22 is faulty, you must first check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement. In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - DAV-RR953WR, TDA7491P, 75019668 DVD-RW DRIVE UNIT, HH SLOT, DAV-RR953WR, RUSS SOH-DL6 (SAMSUNG IM).
Before replacing the TDTC-G429D tuner, if there is no tuning for the channels, first you need to check the supply voltage at its terminals, including the varicap supply (30-33V).
Attention to the owners! Attempts to self-repair the TOSHIBA 15DV703R, 15DV704R TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Toshiba 15DV703R, Toshiba 19DV703R, Toshiba 19DV704R, Toshiba 22DV703R, Toshiba 22DV704R, Toshiba 26DV703R, Toshiba 32DV703R. Service manual and schematic diagram.

 The appearance of MainBoard GRU2 is shown in the figure below:
GRU2
GRU2 can be used in TVs:
TOSHIBA 15DV703R 15DV704R (Panel M156B1-L02 RevC1 79104859), TOSHIBA 15SLDT3R (Panel M156B1-L02 Rev.C1), TOSHIBA 19DV703R (Panel M185XW01 V2), TOSHIBA 22DV703R (Panel V216B1-L04 Rev C1 (L02 Rev C1)), TOSHIBA 22DV704R (Panel V216B1-L04 79105088), TOSHIBA 32DV703R 32DV704R (Panel T315XW04 V.1 79105169 ).
Key Features of the TOSHIBA 15DV703R:
Installed matrix (LCD panel) M156B1-L02 RevC1 79104859.
To power the backlight, an LIPS inverter is used, it is controlled by the OZ9938GN PWM controller (16). The transformer IH-DP9040 (01) DCUM1005 (03) I3 is installed in the inverter converter. As power elements of the inverter, keys of the type 4511GH (5) are used.
The necessary supply voltages for all nodes of the TOSHIBA 15DV703R TV are generated by the DPS-50UP-1A power supply module or its analogs using 6742MR microcircuits (8) and K4101 type power switches.
MainBoard - the main board (motherboard) is a GRU2 module, using chips DAV-RR953WR, TDA7491P, 75019668 DVD-RW DRIVE UNIT, HH SLOT, DAV-RR953WR, RUSS SOH-DL6 (SAMSUNG IM) and others.
The TDTC-G429D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: M156B1-L02 4 Compatible model
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 344.232x193.536 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 65%
Response Time: 2/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 05:24
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