Philips PM3295 and PM3295A - Page 1
Forum section: electronics / testgear

author: david69
author_rank: Regular Contributor
timestamp: February 21, 2016, 09:48:13 am
content: Hi, I suppose that "A" version is newer and use inverter forLCD backlight, older version used graticule? I missed backlighton my PM3295and I can`t find any source for LCD into scopeThere is inverter 300VAC in service manual, but I miss thisinverter and light plate under LCD. There is anything which shouldbe shineThank You for explanation..David

author: david69
author_rank: Regular Contributor
timestamp: March 04, 2016, 02:30:45 pm
content: Here are pictures with display and control unit. Supply 13,8Vfor display is OKBut I don`t have orange backlightThe driver for LCD is PCE2111

author: david69
author_rank: Regular Contributor
timestamp: March 05, 2016, 05:41:52 pm
content: Can be there LED driver in PCE2111?? as AN for new LCD driver??Thanks...

author: david69
author_rank: Regular Contributor
timestamp: October 21, 2016, 05:30:31 am
content: I was looking into bad capacitors in supply in 5VDC digitalsection...

author: tautech
author_rank: Super Contributor
timestamp: October 21, 2016, 06:17:01 am
content: Here I was thinking this wasjusta CRO and wondering what on earth you were going on about a backlight.So yeah, there must be one behind all the LCD panels.Service manual:http://elektrotanya.com/philips_pm3295_service_manual.pdf/download.html30 Mb 322 pagesWait for "processing" to change to "get manual"

author: tautech
author_rank: Super Contributor
timestamp: October 21, 2016, 06:36:14 am
content: P 47 in the manual has the LCD circuit description along with the supply to it is derived from a +13.8V rail.It'snominal4V is ambient temp referenced by transistor V101 to somewhere in the range of 3.5-4.5V.Is this ^ working as expected?

author: david69
author_rank: Regular Contributor
timestamp: November 23, 2016, 12:28:58 pm
content: Yes, collector V0101 BCW33 has 4,25V and C101 R113 isRC for oscillator PCE2111, I have there step down ramps?I have change BCW33 without efect, no CRO?

author: leogala
author_rank: Newbie
timestamp: February 16, 2017, 08:31:50 am
content: I was thinking to replace the lcds of my PM3295A with nice 0.96'' OLED displays available for a ridiculous price on aliexpress. Shouldn't be difficult to interface them with the serial protocol of the led driver, just a bit of reverse engineering on the meaning of the bits.... Anyone interested in the project ?

author: leogala
author_rank: Newbie
timestamp: March 07, 2017, 04:34:55 pm
content: Done ! Upgraded to OLED with the help of an arduino, less than 20$ in total. So cool !

author: mvdswaluw
author_rank: Contributor
timestamp: March 07, 2017, 04:54:18 pm
content: Quote from: leogala on March 07, 2017, 04:34:55 pmWow, nice professional look!

author: cvanc
author_rank: Frequent Contributor
timestamp: March 07, 2017, 05:04:17 pm
content: That is absolutely badass. Well done!

author: tautech
author_rank: Super Contributor
timestamp: March 07, 2017, 07:36:09 pm
content: Very nicely done, congrats.If you took some time to document the conversion with some pics and code if you want to share it....maybe best in another thread with links to this one.....anyway it could be of great help to others.

author: cheeseit
author_rank: Regular Contributor
timestamp: March 07, 2017, 09:10:07 pm
content: Very nice!+1 on documenting this.

author: david69
author_rank: Regular Contributor
timestamp: March 15, 2017, 03:40:38 pm
content: it is very nice! but You must have different firmware ??I can`t set Your screen with displayed frequency "kHz" ACvoltageand etc... So, can I look for newest firmware and change it??

author: david69
author_rank: Regular Contributor
timestamp: March 15, 2017, 04:04:56 pm
content: my settings, no orange ?backlight?

author: leogala
author_rank: Newbie
timestamp: May 03, 2017, 06:50:41 pm
content: I reverse engineered the serial protocol by means of an Arduino. Then I implemented the parser on an Arduino mini. If someone is interested I can provide the arduino c source files, I've not documented the protocol but it works perfectly.This is the link to the displays I used.

author: tautech
author_rank: Super Contributor
timestamp: May 03, 2017, 07:21:07 pm
content: Quote from: leogala on May 03, 2017, 06:50:41 pmPlease do. It helps those that might find this thread in the future and need the same solution/fix.

author: leogala
author_rank: Newbie
timestamp: May 05, 2017, 08:12:08 am
content: Ok, I opened a new thread concerning my upgrade.see:https://www.eevblog.com/forum/projects/pm3295a-oled-upgrade/