LCD monitor repair books - Page 1
Forum section: electronics / repair

author: rhb
author_rank: Super Contributor
timestamp: January 06, 2025, 05:57:26 pm
content: I'm looking for one or more good books on LCD monitor repair. Does anyone have any they would recommend? Everything I currently have is CRT era stuff and due for a purge.Current issue is failing backlight. Flashes on and goes back off. That's a pretty simple repair, but I would like to fill in the technological gap in my library and my knowledge of the details. My general rule of thumb is 2-3 good books on a topic. Everyoneleaves out something or explains it poorly.Absolutely NOT interested in youtube videos. BW is much too low and content unreliable.Have Fun!Reg

author: MathWizard
author_rank: Super Contributor
timestamp: January 09, 2025, 09:50:30 pm
content: I don't know any books to recommend, but I'm sure I've found some modern TV repair type pdf books, some of them as part of pdf collections on torrent sites. But I never really used them, I have some EE textbooks, and for repair advice I just used the net and youtube.But in general, a LCD TV or monitor, will have some Switch Mode Power Supplies, SMPS stages, like to go from 170VDC, down to say 12 or 5VDC voltage rails, like for powering common chips and their circuits. And the Standby power, is also a largely separate SMPS. And then some other step-down converter might take 12V and turn out 3.3V for some video IC's.And then they might have some sections going from 170VDC down to 50V, and then another stage taking that 50V back up to 150V, but like putting a transmission into different gears for different loads and speeds. I have a broken LED TV with voltage rails something like that.There should be lots of good general electronics repair books that would cover the basics, like the mains input, and rectifier's, and linear regulators, diodes/BJT's/etc. And any modern book should get into SMPS's , switching regulators/etc too.Once you know the power sections are OK, then you could move on to the rest of the TV/monitor.If I had it here, I'd check all kinds of stuff un-powered with a DMM, then turn it on and make sure the voltage rails are ok, and if not, why not.Like for instance if the capacitors in the backlight output stage are failing, and they leak and can't build up enough voltage, the controller will probably sense that, and shut down for a while, or even until the TV resets.

author: rhb
author_rank: Super Contributor
timestamp: January 09, 2025, 11:01:26 pm
content: I cleaned the PCB just out of habit, hooked it up to measure the OVP pin with my DSO and it works! No issues at all so I put it back together and on the stand.My best guess is that lint from sitting 3 m from the dryer for 16 years had eventually created a high resistance surface path when the humidity went up. These tubes are 500 kilohm, so a few megohms would easily overload the HV supply chip 750 v @ 1.5 mA.Would still like something like a traditional TV repair book or two.Have Fun!Reg

author: Swake
author_rank: Frequent Contributor
timestamp: January 11, 2025, 03:35:23 pm
content: Google can help you find some free PDF's in English from the Indian 'PANEL REPAIR FACTORY' with theory of operations and repair examples. These contain information and tips how to start digging and many pictures, not super in detail, and somewhat brand related, but it is a starting point.There are many PDF's for sale, don't buy them. Lot's of promises, not much explanations, many schematics, but in the end low quality content.