Electronics > Repair
LCD screen model M270HTN02.0 need help in identyfying a component
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brkklcl:
Hello, I have the same problem. I searched for the input fuse and Q308 a09t. I couldn't find it in my country. I changed it to AO3400(N55G) but the white screen still continued. P 303-19 3rd and 4th pins got hot. W1 burned. I bought a Zenner diode with the market code W1 (BZX84C2V4) and changed it but the result didn't change. Right now I have W1 and N55G and the area I mentioned about P303 is getting hot. Also, I noticed in the picture that you installed P302-19 instead of P303-19. Are they the same? I hope someone will answer. I have been dealing with this monitor for a long time. I deal with electronics as a hobby and this monitor was more important to me than buying a new one. Since I don't know English, I used translate. Sorry for the mistakes.
StowAway:

--- Quote from: brkklcl on September 10, 2024, 06:51:31 am --- I bought a Zenner diode with the market code W1 (BZX84C2V4) and changed it but the result didn't change.

--- End quote ---

Actually, W1 (Q302) is P-mosfet. I'm almost sure that AO3401. Here is actual tester output of Q302 element: P-E-MOS 1G, 2S, 3D; Vt=0.81V, Cg=1.61nF, Rds=0.00. In my case label is W1701.

If anyone needs it, here is the tester output also for Q301 W5717 (25H02 in my case): P-E-MOS 1G, 2S, 3D; Vt=1.80V, Cg=862pF, Rds=0.00.

I think in your case P303-19 is damaged. You need to order it from China or find it on a donor, there are some tcon boards with such a controller. I found it on 55T32-C0F.
But there is a big chance that the controller will not work without the appropriate firmware inside.
If P303.19 responds via I2C, I would save the registers from it. This can be done through the test points next to the connector, they marked as TPI2C_P303.

In any case, I am attaching the datasheet for the Chinese clone P303.19 (G2510S) and its firmware from the M270HTN02.2 matrix, which in theory should work the same way on the M270HTN02.0.
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