About EEPROM Hex file
Once in a while I will get question from ERG members about the hex file in EEprom IC “Sir do you know how to read and modify the hex file” if the EEprom data had corrupted”? My answer to them was no i do not know how to read the hex files. Since i can’t […]
Display Problems In CRT TV/Monitor
I suggest that you print out this images of CRT TV/Monitor display problems for reference. To some beginners, they do not know how a pincushion or a keystone distortion problem look like. It is important to know these images so that you will know which section to check when you test the CRT TV/Monitor with […]
Testing The Internal High Voltage Diode In Flyback Transformer
A leaky or shorted internal diode in the flyback transformer of a CRT TV or Monitor would cause the set to shutdown upon power on, power blink and even blowing some of the corresponding components like the HOT, B+ FET and B+ coil. Usually if the diode have a direct short circuit it will be […]
Same IC Part Number But Not Working
Do you know that although IC that have the same part number, it can’t be used? The type of IC’s that I’m referring to are the Program ICs such as the EEprom and the MCU. For other types of IC’s like the linear and the TTL ICs if the part number is the same then […]
Replacing The B+ Coil With A Wire?
I believe CRT Monitor repairers came across B+ coil in the circuit. The function of the B+ circuit (boost circuit) is to boost the Dc voltage from the SMPS so that it can be channeled it to the flyback transformer primary winding. The B+ voltage is required to support different resolution in the Monitor. That […]
Sparking In The CRT Tube Neck
If you come across sparking (blue arc) internally in the CRT tube neck, there could be two causes. It could be the high voltage generated too high by the flyback transformer (due to a higher than normal B+ voltage) or the picture tube itself have problem. A leak (usually a mild crack at the neck […]
A, AF, AX, D, DF, DX Version of HOT
If you repair CRT Monitor I’m sure you might have came across Philips Horizontal output transistor (HOT) that have many version behind each part number. For example, BU2508A, BU2520AF, BU 4522AX, BU4523DX and etc. For your information the A version does not have a built in damper diode but the D version have damper diode […]
Never Give Up Attitude In Electronic Repair
For the past few days I’d been supporting one of my ebook buyer and also an ERG member about no power in a CRT Monitor. He had tried to repair the Monitor but just could not find out the problem. I gave him lots of advice and eventually he emailed me today and i replied […]
Higher Capacitor Value For Safety Capacitor
If you come across HOT that always burnt after replacement then you should check out the capacitance value of the safety capacitor which is located nearby the flyback and the HOT. If you do not know which one then try to trace from the collector pin (center pin) of HOT and you should see that […]
Open Circuit In Heater (Filament) Of CRT Tube
After so many CRT Monitors sent in for repair, i could say that i only came across one unit of a 14″ Acer Monitor that had an open winding in the filament (heater). The complaint was no display but have high voltage and i found that the heater was present but there was no glow […]
This is the journey of Jestine Yong in Electronic Repairing. In this blog, you’ll find his Electronic Repairing experiences, tips, tricks, guide & recommendations. Feel free to browse around the blog and absorb as much electronic repair tips as you could. Thanks for visiting!
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