The repair machine Chuangjia 32HME8000 R30 repair process. - appliance repair - Huaqiang Electronic Network

MOS power IC full range

Probe current voltage pin 420*4450 head diameter 5.0 over current and voltage pin

Single chip microcomputer STM32L151CCU6

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

I recently took over a Chuangjia 32hme8000 R30 rework machine, which had three major issues before disassembly. The master of the three-in-one board had already done some serious damage to the main board, making it almost unrecognizable. As shown in the image below.



The insurance was burned out, the chip was removed, and many surrounding components were missing. I tried to find some information online about the power chip FAN6755, but since the rework machine had so many parts missing, after more than 30 minutes of trying, I gave up. I don’t repair for maintenance anymore—this one just wasn’t worth it. I’ll just say it like it is. The board design uses 12V and a 35V backlight power supply. A few days ago, I received a TCL screen that had been broken, and I decided to test the external power board from the same model. It looked good, so I went ahead with the repair.



I connected P-NO and the 3.3/5V strong start, along with 12V, 24V, and ground connections, as well as the backlight flash protection. The backlight IC used on the board is AP3064. The 35V and 12V supplies were normal, and the backlight control voltage was 3.6V, while the brightness signal was 3.3V. I wonder if the added 35V boost load was too much, causing the protection circuit to trigger, or if the previous technician accidentally touched something they shouldn't have?

Here's the pin diagram of the AP3064:


In the end, I had no choice but to use a universal constant current board for testing.