It was a beautiful evening when an old friend, a big brother, brought his Panasonic TH-L32BF6C TV for repair. I couldn't resist the urge to dive into the challenge. Grandpa Lei took it away with some force, but I had no choice but to fix it. I started working on it immediately, determined to bring it back to life.
The first thing I noticed was that the power supply was in bad shape. The bridge rectifier was intact, but most of the components were destroyed. The OB5269CP, 9N65, and G foot were all damaged. I replaced them, but there was still no output. I tested the board with a bulb, but it didn’t light up. Then I checked each section: backlight driver, power supply, CPU, sound, memory, and input conversion IC. Everything seemed to be failing—no signal, no power, nothing.
I thought I had hit a dead end, but I refused to give up. I remembered the logic board and screen needed checking too. I measured the power supply and found 3.3V VDD. That gave me hope. I tested the LVDS port and found everything normal—DE, CLK, VGH, VGL, HVDD, etc. Still, something was wrong.
I used a 1.5V battery to short-circuit the lines and found that CS11003 was hot. It was definitely shorted. I removed it carefully, even without a hot air gun. After removing the pins and cleaning the pads, I rechecked and found no short. Great!
Next, I ordered a replacement from Ma Yunjia. The model turned out to be a TCL motherboard, and I got two spare parts: I18H48 and CS11003. I installed them, connected P-ON to 3.3V, and controlled 24V via a MOS. The standby tube was still not working, but I wasn't giving up.
I tested the LED backlight driver MP3394 and found a short. The 12V regulator was broken, and the series resistor was open. I fixed it by adding a 47uF capacitor. Powering it on, P-ON, ADJ, and BL-ON received 3.3V, and the backlight worked perfectly. Finally, I felt a sense of accomplishment.
The next day, the motherboard arrived. I quickly installed the CS11003, using a small heat sink to prevent overheating. When I powered it on, the screen showed a blue screen. I connected the signal, but there was red noise on the black background. I checked the LVDS signals and found they were 0.03V lower. I fixed the grounding issue, and everything worked smoothly after that.
The final result was perfect. I was really happy with the outcome. This repair taught me a lot, and I’m proud of what I achieved. Sometimes, the hardest challenges lead to the greatest rewards. Communication With Built-in Mastic Cold Shrink Tube High rate silicone communication cold shrinkable tube through the special silicone rubber raw materials made of high rate cold shrinkable tube. The cold shrinkable tube has the advantages of large shrinkage rate (4 and 5 times shrinkage), excellent physical and mechanical properties, puncture resistance, good sealing and protection performance and long-term protection. Products through the ROHS certification standard colour is black and grey, other colours can be customized. Suitable for communication feeder, cable TV connection joints waterproof moisture sealing, wire and cable connection insulation sealing; other types of connectors, size of the head of the reducer and shaped parts, antenna feeder reducer joints insulation protection. Cold Shrink Tubing for Communication,cold shrink tube,Built-in Mastic Cold Shrink Tube,Shrink tube Mianyang Dongyao New Material Co. , https://www.mydyxc.com