LCD TV Power Supply (IP BOARD) Schematic Diagram & Repair Tips for Sharp LCD TV-Intermittent Sound Problem. http://www.LCD-Television-Repair.com This is Samsung LCD TV BNB inverter power supply (IP board) schematic diagram. Where this power supplies are using on Samsung LN-TH LCD Tv or other similar LN-T19 series lcd tv. Below is the picture of this PSU: S() REV.1 Page Rev. 0 Page 12 08 BNB PROJECT CODE SPECIFICATION PSIVA DATE OF REFORM IPT DATE OF MAKE (A) POWER http://www.LCD-Television-Repair.com S() REV.1 Page Rev. 0 Page 13 BNB 08 IPT DATE OF MAKE SPECIFICATION PROJECT CODE PSIVA DATE OF REFORM (B) INVERTER http://www.LCD-Television-Repair.com LV Bulletin # LCDTVA Page 1 of 2 Technical Bulletin Number: LCDTV A Date: MARCH, Models: LC26D4U / LC32D4U / LC37D4U / LC26D6U / LC32D6U / LC37D6U LC26DA5U / LC32DA5U / LC37DB5U / LC32HT1U LCD TELEVISION Cause: The insulation pad located on audio output IC breaks down. Countermeasure: If the symptom of no audio or intermittent audio is occurring on the above models, please place the insulation pad on the foil side of IC between the PWB and the heat sink. The IC is located on the AV unit. Please refer to the following pages for the correct installation procedure. Description Part number Price code Insulation Pad PSPAZAWJKZ AK Subject: No audio or intermittent audio LV Bulletin # LCDTVA Page 2 of 2 1. Remove heat sink of IC (Audio Amp IC) on the AV unit. 2. There is no need to remove the residue from the old cooling sheet. 3. Place the insulation pad on the heat sink. Use part number: PSPAZAWJKZ – Insulation Pad 4. Reattach the heat sink with the new insulation pad to the AV unit. 5. Do not over tighten the screw holding the heat sink to the chassis. NOTE: If the symptom is not cured after replacing the cooling sheet, please check if the audio amplifier IC (VHITA++-1Y) is damaged. Thank you for your subscription. For more information on what’s new update on the members’ area, you can refer to the Newsletter site. When you had subscribed to our newsletter list, we will send an email to you once or twice every month and let you know what’s latest repair information has been uploaded and what’s the free repair information on this month too. By the way, if you want to become a professional in repairing LCD TV, then you must have the correct repair information, repair tips & etc to improve yourself. And at the same time, you also need to know, where to find the spare parts/components for your replacement. Don’t waste your time, most of these information are inside the LCD TV Repair membership site. Thanks and have a nice day, Kent http://www.LCD-Television-Repair.com **Feel free to pass this article to your repair friends and colleagues**
Repair And Test Of LED TV Power Supply Board Without Connecting To A TV
In the E-book written by Kent Liew Smart-OLED/LED/LCD TV Repair Tips – V6, chapter: “Another New Tool to easily to do the PSU self-test with monitoring feature”, guides the reader on how testing can be performed on a PSU without having to connect to the TV. This test can confirm the condition of the PSU on whether it is working or it is faulty. With the knowledge gained from Jestine Yong to repair the PSU, I took on this challenge to begin the repair. I decided to repair a faulty Power Supply Unit (PSU) on hand to test the method specified in the E-Book.
I perused the web and managed to obtain the circuit diagram for the PSU as depicted in Figure A.
This test board as shown in Figure B, can be bought from AliExpress.
The PSU tester has built-in load resistors (3 X 5W) to simulate connection to LCD/LED TV, which will switch the PSU on if connected.
Visual checks confirmed that there were no burnt parts. When the PSU was connected to the tester, the tester did not turn on, indicating that the PSU was faulty. According to the label in the PSU output side, the stand-by volt is 5VDC marked as 5VSB (Voltage Standby). This voltage is supplied to the mainboard of the TV. Without this voltage the TV will not turn on.
Upon checking the primary supply towards Pin 1 and 3 of TA (Circle in RED), V was noted and this proof that this voltage was not boosted. This confirmed that the primary side of the PSU was working well except that the VDC was not boosted. This means the PFC circuit was not working due to the missing 12 volt DC (12 VSB) from the main power supply (look at figure E). When checking the Schottky Barrier Diodes, it came to my attention that the bottom diode (D – Circle in ORANGE) was shorted as displayed in Figure C.
After replacing the faulty diode, the fault remained. The ring tester confirmed that the transformer is in working order (Full lights). This test was performed at pin 1 and 3 of TA without applying power to the PSU as shown in Figure D.
Examining the PFC circuit, I realized the PFC IC U pin 8 (VCC) had no voltage supply as shown in Figure E.
Following the VCC_PFC supply line, the VCC_PFC supply to U as portrayed in Figure F, was noted that it was coming from the below circuit:
The Drain (D) pin receiving VDC steps down the voltage through built in regulation circuit ( volt) and this means this IC does not need a start up resistor. This is depicted in Figure G.
Suspecting a faulty IC U (no switching) -figure H, I replaced the faulty LNK with a LNKV as it was the direct substitute for LNK available for replacement in the market. This replacement IC resulted in the 12 volt DC output (12 VSB) return.
However, there was still no standby voltage of 5VSB. Upon tracing the voltage lines of the DC-to-DC converting circuit, it came to my knowledge that the 5VSB is produced by IC U (MPEN), a high frequency step-down switching regulator with an integrated internal high-side high voltage power MOSFET. This can be observed in Figure I as shown below.
When probing, I realized that Pin 7 of U was receiving the 12VSB but there was no voltage output at pin 1. I proceeded to replace the U which resulted in the return of the 5VSB.
Finally, I tested the repaired board with load using the PSU tester as shown in Figure I. Connecting the repaired board to the tester showed that the PSU is fully functional.
With the guidance of Jestine Yong, I was able to complete this repair within a week, a record timing for me! I hope it was an informative read for you. Thank you for reading thus far. Do try this approach should you encounter a power supply unit without a TV for testing.
This article was prepared for you by Michael Selvam from Singapore, a 57 year old zealous electronic enthusiast. As a passionate electronic repair hobbyist, he tinkers with home entertainment systems and any faulty electronic equipment he gets his hands on. He obtained his knowledge to repair by reading books and took up the electronic courses I conducted. At present, he is employed as a Cluster Manager (Property Management) with CapitaLand and does his repair whenever time permits.
From Jestine: For your information, Michael was my training student and you can check out his training photo HERE.
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P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous repair article below:
LED TV RepairSours: https://jestineyong.com/repair-and-test-of-led-tv-power-supply-board-without-connecting-to-a-tv/
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A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, under-voltage lockout, Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with discrete MOSFET and PWM controller solutions, the FSQ-series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost-effective designs of valley switching ﬂy-back converters.
SenseFET source terminal on primary side and internal control ground.
Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 (Vstr) via an internal switch during startup. It is not until \/CC reaches the UVLO upper threshold (12V) that the internal startup switch opens and device power is supplied via the auxiliary transformer winding.
The feedback voltage pin is the non-inverting input to the PWM comparator. It has a mA current source connected internally while a capacitor and opto-coupler are typically connected externally. There is a time delay while charging external capacitor C, from 3V to 6V using an internal 5pA current source. This delay prevents false triggering under transient conditions, but still allows the protection mechanism to operate under true overload conditions.
This pin is internally connected to the sync-detect comparator for valley switching. Typically the voltage of the auxiliary winding is used as Sync input voltage and external resistors and capacitor are needed to make delay to match valley point. The threshold of the internal sync comparator is 0.?VfV.
This pin is connected to the rectified AC line voltage source. At startu p, the internal switch supplies internal bias and charges an external storage capacitor placed between the Vcc pin and ground. Once the \/CC reaches 12V, the internal switch is opened.
The drain pins are designed to connect directly to the primary lead of the transformer and are capable of switching a maximum of V. Minimizing the length of the trace connecting these pins to the transformer decreases leakage inductance.
The FAN is an active power factor correction (PFC) controller for the boost PFC applications that operates in critical conduction mode (CRM). It uses the voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate MOSFET turn-off signal. Because the voltage mode CRM PFC controller does not need the rectiﬁed AC line voltage information, it can save the power loss of the input voltage sensing net- work necessary for the current mode CRM PFC control- ler. FANO provides many protection functions such as over voltage protection, open-feedback protection, over- current protection, and under-voltage lockout protection. The FAN can be disabled if the INV pin voltage is lower than V and the operating current decreases to 65uA. Using a new variable on-time control method, THD is lowerthan the conventional CRM boost PFC lCs.
This pin is the inverting input of the error amplifier. The output voltage of the boost PFC converter should be resistively divided to V.
This pin is used to set the slope of the internal ramp. The voltage of this pin is maintained at 3V. If a resistor is connected between this pin and GND, current flows out of the pin and the slope of the internal ramp is proportional to this current.
This pin is the output of the transconductance error amplifier. Components for the out- put voltage compensation should be connected between this pin and GND.
This pin is the input of the over-current protection comparator. The MOSFET current is sensed using a sensing resistor and the resulting voltage is applied to this pin. An internal RC filter is included to filter switching noise.
This pin is the input of the zero current detection block. If the voltage of this pin goes higherthan V, then goes lowerthan V, the MOSFET is turned on.
This pin is used for the ground potential of all the pins. For proper operation, the signal ground and the power ground should be separated.
This pin is the gate drive output. The peak sourcing and sinking current levels are +mA and mA respectively. For proper operation, the stray inductance in the gate driving path must be minimized.
This pin is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.
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