The customer sent Changhong plasma TV PT32600, the indicator light flashed, and it could not be turned on twice.
Turn on the inspection and visually check that the capacitor has no drum top. 5V, 16v, the voltage of the switch is normal, but the VS, VA voltage are almost 0, normal should have 190v, 60v.
Plasma TV repair is not much, Baidu data, two 2200UF10v electricity is easy to break, looking for 2 temperature-resistant 105 degrees, or not. Then Baidu, "no VS, VA voltage, easy to burn R801" Ha ha ha lucky so sure, and found that C804 ceramic capacitors were blown up, put on the test machine, everything is OK.
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Changhong plasma TV PT32600 does not boot the common reasons are:
1, F101 insurance burst is mostly PFC circuit power MOS tube Q602, Q603 (SD20N60) one of them is damaged, replace the same model;
2, the indicator light is not turned on twice, shorted to the power supply board P814 2, 3 feet (5V / STBY) after the VS, VA output, the resistance R801 damage more.
3, PT32600 black screen, with sound The machine uses LG screen, open the back cover and found that the two 5V filter capacitors on the power board have been drummed, measuring 5V on 3.5V or so, after replacing 2 capacitors, the machine is normal.
This kind of fault has already encountered 2 sets, if you have encountered this phenomenon, try it.
4, PT32600 boot indicator is on, VS voltage work immediately protect, the user said this phenomenon for some time, sometimes boot normally,
To clean the PFC and AC detection circuits of the printed board, it is best to remove the resistor and scrape the glue off. Change R816 to 0.1 ohm resistor
5, PT32600 black screen failure
PT32600 TV black screen, for Y board 2 days test machine is normal, handed over to the user. Only after three days, the user calls again to say that there is no sound, after checking, VS boot instantly, then there is no, the sound is always normal. Remove The FS2 4A250V on the Y board is turned on normally. But occasionally there is a black screen phenomenon. The VS voltage can be turned down by a few volts to work. When the VS ADJ is adjusted to 194.4V, the VS power supply starts. Protected, now it is no longer protected when it is adjusted to 190V.
6, PT32700 black screen
A PT32700 has a black screen with sound. Through the screen self-test, it is judged that the fault is on the Y board, and the VS voltage and VA voltage are normal. The FS3 and C151 on the Y board are damaged, and the test machine is normal after replacement.
PT32600; use PDP32F1T374, PDP32F1X031, PDP32F1Y031, PDP32F10000.
7, PT32600 light dark, ghost face
The voltage of the Y board is normal. After the replacement, the voltage is not good. After replacing the X board, it is better. When the fault occurs, the X board voltage is 98V, and the good time is 128V. It is good to find the X board FL3 break.
8, PT32600 maintenance examples
When I overhaul the PT32600 black screen, I found that the VS and VA voltages of the machine are normal. The first leg on the socket P3 of the Y board, (black line) should have 15v voltage, no, the resistance to the ground is only one hundred ohms, after It is found that the capacitor C151 is leaking, and the fuse resistor F4 on the Y board is open, and it is normal after replacement.
9, PT32700 second does not boot maintenance examples
Model: PT32700
Fault: secondary power supply protection
Overhaul: The secondary power-on VS voltage rises to 190V and immediately drops to OV, initially determining that the power board is broken. Continue to check that the VA voltage drops to 0 when it rises to 6V at the moment of startup. It is suspected that there is a problem with the VA forming circuit. Replace the circuit IC901 (CQ0565) troubleshooting.
The Q852 (FQPF9N25C) in the PT32600 power supply can be replaced with 5N65A.
