LCD/LED TV Screen Panel DC to DC IC Voltages Complete Guide

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Panel DC to DC Voltages

Hi Friends! In this tutorial, we will teach you all about LCD/LED Screen panel dc to dc circuit and voltages testing points on the panel in an easy way, I will tell you how to check panel voltages in an easy way. I have mentioned a table below you can check all the voltages according to this table, for example, AVDD, VGH, VGL, VDD, Hvdd and much more.

Panel Voltages Missing Problems  

Missing VoltagesProblem
12vWhite Display
3.3vWhite Display
HVDD VoltagesWhite Display or Picture Problem
AVDD VoltagesWhite Display-Negative Picture
VGL VoltagesWhite/Blue Display With Lines
VCOM VoltagesNegative Picture-Brightness Dim
DVDD VoltagesWhite Display-Blinking Picture
VGA VoltagesNo Picture
VGL VoltagesSlow Picture

Please see the below table if you are getting the problem from these all problems then see the second table and also see what voltages are missing. You should have all voltages on the DC to DC IC Voltages Test points according to this table, if you are getting all the voltages, then you have to diagnose other things, it’s not DC to DC IC Problem. Otherwise, if you are not seeing all the voltages according to the table then you can give correct voltages to the point by the table.

Screen Panel DC to DC IC Voltages

NO. Testing Point Min Voltages Max Voltages
1 VGH 25v 32v
2 VON 25v 32v
3 VGON 25v 32v
4 VDDG 25v 32v
5 VGL -5 -10
6 VOFF -5 -10
7 VGOFF -5 -10
8 VEEG -5 -10
9 VDD 3.3v 3.3v
10 VLOGIC 3.3v 3.3v
11 VDDD 3.3v 3.3v
12 DVDD 3.3v 3.3v
13 VDA 12v 14v
14 AVDD 12v 14v
15 VDDA 12v 14v
16 VSOURCE 12v 14v
17 HAVDD 8v 9v

NOTE: Please do al the operations at your own risk, we will not be responsible if you do any problem during the repair.

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