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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Tuesday 10 March 2020

REPAIR / SERVICING TV SONY KLV-26BX300

Technical description and composition of the TV SONY KLV-26BX300, type of panel and applicable modules. The composition of the modules.
SONY
Model: KLV-26BX300
Chassis / Version: AZ1A_5-2
Panel: T260XW05 V.0 T260XW05 V.0
Inverter (backlight): 4H.V3138.001 T78I066.00
Power Supply (PSU): G1LS-E PSC10307
PWM Power: SSC9513 (PWM Resonant), R2A20113 (PFC), A6079 (Standby)
MOSFET Power: K10A60D
MainBoard: 1-880-238-21
IC MainBoard: MT5388GF MG, TPA3110D2, H5PS5162FFR, K9F1208UOC
Tuner: TEQE8-L01A
Control: RM-GA019
SONY
Model: KLV-26BX300
Chassis / Version: AZ1A_5-2
Panel: V260B3-L05 C1
Inverter (backlight): 4H.V3138.001-B1
Power Supply (PSU): G1LS-E
PWM Power: SSC9513 (PWM Resonant), R2A20113 (PFC), A6079 (Standby)
MainBoard: 1-880-238-21
IC MainBoard: MT5388GF MG, TPA3110D2, H5PS5162FFR, K9F1208UOC
Tuner: TEQE8-L01A
Control: Remote: RM-GA019, IR: 1-880-416-11 (1-731-165-11) A1744833A
Technical Specifications KLV-26BX300
SONY KLV-26BX300
General recommendations for repairing TV LCD
It is advisable to start the repair and diagnostics of the SONY KLV-26BX300 TV with a careful external examination of the internal and external elements, including case parts, a 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. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the SONY KLV-26BX300 does not turn on, no control lights on the front panel are on or blinking, therefore, there is a very high probability of a malfunction of the G1LS-E power module. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the likelihood of an avalanche or thermal breakdown.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason, and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM SSC9513 chips main power supply unit A6079 dezh 20113 PFC from the manufacturer.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If there is no image when you turn on the SONY KLV-26BX300, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or the power converter (inverter) are malfunctioning. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the supply voltage of the TEQE8-L01A tuner varicaps, which is usually within 30-33V, as well as other supply voltages on the tuner terminals.
Remember! Attempts to self-repair by users of the SONY KLV-26BX300 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual  KLV-22BX300, KLV-26BX300, KLV-32BX300, KLV-40BX400 -------------------> Sony KLV-22BX300, KLV-26BX300, KLV-32BX300, KLV-40BX400 Chassis AZ1-A

  Service manual -------------------> PSC10307 Power supply



 The appearance of MainBoard 1-880-238-21 is shown in the figure below:
1-880-238-21
1-880-238-21 can be used in televisions:
SONY KLV-26BX300 (Panel T260XW05 V.0 T260XW05 V.0), SONY KLV-26BX300 (Panel V260B3-L05 C1), SONY KLV-32BX300 (Panel LTY320AP04), SONY KLV-32NX400 (Panel LTY320AP5 001).
PSU Advanced
The KLV-26BX300 TV is equipped with a G1LS-E power module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the R2A20113 PWM controller does not allow the electrolytic capacitor of the input rectifier filter to be connected to the network directly through open diodes, when the reactance (about 15-30 ohms at a frequency of 50 Hz) determines the charge current. As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the device SONY KLV-26BX300:
Installed matrix (LCD panel) V260B3-L05 C1.
To power the backlight, an inverter 4H.V3138.001-B1 is used.
The necessary supply voltages for all nodes of the SONY KLV-26BX300 TV are generated by the G1LS-E power module or its analogs using SSC9513 (PWM Resonant), R2A20113 (PFC), A6079 (Standby) microcircuits.
MainBoard - the main board (motherboard) is a module 1-880-238-21, using microchips MT5388GF MG, TPA3110D2, H5PS5162FFR, K9F1208UOC and others.
The TEQE8-L01A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V260B3-L05
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 08:34
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